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Yulong Li
School of Aeronautics, Northwestern Polytechnical University, 710072 Xi'an, China

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Journal article
Published: 08 July 2021 in International Journal of Impact Engineering
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This paper studies the quasi-static and dynamic mechanical behaviors of a commercial corrugated sandwich panel under combined shear-compressive loading by using a modified MTS machine and the so-called Rotatable Hopkinson Bar (RHB) loading system. Particular focus is placed on identifying the differences of large deformation behaviors of corrugation panels between uniaxial compression and combined shear-compression, especially the influences of shear-compressive loading angle and loading rate on the stress-displacement curves and the deformation modes. It is found that the normal stress decreases with the loading angle, while the shear stress increases with it for both the quasi-static and dynamic loadings. Three deformation patterns are identified for five different loading angles from 0o (corresponding to uniaxial compression) to 50o. A positive loading rate effect is found for the initial collapse of corrugated panels, which is contributed to the inertia effect within corrugation buckling. The strength of the panels after initial collapse shows a negative loading rate effect, which may be due to the strain softening behavior of base material (5754-H48 Aluminum alloy) at impact loading.

ACS Style

B. Hou; Y. Wang; Z.B. Tang; H. Zhao; X.L. Xi; Y.L. Li. The mechanical behaviors of corrugated sandwich panel under quasi-static and dynamic shear-compressive loadings. International Journal of Impact Engineering 2021, 156, 103956 .

AMA Style

B. Hou, Y. Wang, Z.B. Tang, H. Zhao, X.L. Xi, Y.L. Li. The mechanical behaviors of corrugated sandwich panel under quasi-static and dynamic shear-compressive loadings. International Journal of Impact Engineering. 2021; 156 ():103956.

Chicago/Turabian Style

B. Hou; Y. Wang; Z.B. Tang; H. Zhao; X.L. Xi; Y.L. Li. 2021. "The mechanical behaviors of corrugated sandwich panel under quasi-static and dynamic shear-compressive loadings." International Journal of Impact Engineering 156, no. : 103956.

Journal article
Published: 16 March 2021 in Composites Science and Technology
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The biaxial tensile failure of short carbon fibre reinforced polyether-ether-ketone (SCFR-PEEK) composites is characterized in this paper. An improved cruciform specimen was proposed to apply biaxial stresses, and five different stress ratios were employed in experiments. The stress distribution within the gauge section is not measurable across the varying stress ratios, therefore it is not trivial to obtain stress-strain data in the experiments. In this work, a combined experimental and numerical approach was proposed to deduce the true material behaviour during biaxial tensile tests. A numerical model with consideration of anisotropy and plasticity was proposed, it was further calibrated with uniaxial experiments and then validated with biaxial tests. Through this approach, the failure stress states at different stress ratios were successfully obtained. Compared with the numerical results based on constitutive relations, numerical results with linear elastic simplification overestimate the biaxial tensile strength, and are not suitable for material with an apparent nonlinear segment. The biaxial tensile failure envelope matches the Tsai-Hill criterion, and equal biaxial tensile results can be used for determining interaction coefficient F12 in the Tsai-Wu criterion. This research approach offers an accurate and reliable solution for biaxial tensile testing of materials with consideration of anisotropic and nonlinear behaviour.

ACS Style

Huaipu Kang; Lin Qi; Haoyuan Dang; Kanghua Jin; Daniel Thomson; Hao Cui; Yulong Li. Biaxial tensile failure of short carbon-fibre-reinforced PEEK composites. Composites Science and Technology 2021, 208, 108764 .

AMA Style

Huaipu Kang, Lin Qi, Haoyuan Dang, Kanghua Jin, Daniel Thomson, Hao Cui, Yulong Li. Biaxial tensile failure of short carbon-fibre-reinforced PEEK composites. Composites Science and Technology. 2021; 208 ():108764.

Chicago/Turabian Style

Huaipu Kang; Lin Qi; Haoyuan Dang; Kanghua Jin; Daniel Thomson; Hao Cui; Yulong Li. 2021. "Biaxial tensile failure of short carbon-fibre-reinforced PEEK composites." Composites Science and Technology 208, no. : 108764.

Journal article
Published: 06 February 2021 in Materials Science and Engineering: A
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Aluminum composites reinforced with carbon-based nano-particles or fibers have been widely studied. Yet, the rate dependence of their properties has been barely reported. In the present study, CNTs-reinforced Al composites with CNTs of two aspect ratios were produced by different powder metallurgy methods, followed by spark plasma sintering and hot extrusion. The mechanical properties and the underlying mechanisms of CNTs-reinforced Al composites at various loading rates were studied, with the aim of exploring the role of CNTs on strengthening, esp. on rate-dependent properties. The mechanical experiments revealed that the addition of CNTs not only increased the strength but also the strain rate sensitivity in comparison with pure Al. It was found that, under dynamic loading, the materials showed an increased strength and elongation-to-failure simultaneously, due to improved strain hardening rates. A careful analysis suggested that the long-range back stress produced at the CNTs-Al interfaces and the geometrically necessary dislocations accumulated due to strain gradient along the interface, mainly contributed to the strain hardening of CNTs/Al composites. A novel microstructure-based model using microscopically non-uniform dispersion of CNTs was proposed to account for the mechanical properties with better prediction than the traditional models. The results might shed some light on understanding metal matrix composites reinforced with nano-particles or fibers.

ACS Style

M. Wang; Y. Li; B. Chen; D. Shi; J. Umeda; K. Kondoh; J. Shen. The rate-dependent mechanical behavior of CNT-reinforced aluminum matrix composites under tensile loading. Materials Science and Engineering: A 2021, 808, 140893 .

AMA Style

M. Wang, Y. Li, B. Chen, D. Shi, J. Umeda, K. Kondoh, J. Shen. The rate-dependent mechanical behavior of CNT-reinforced aluminum matrix composites under tensile loading. Materials Science and Engineering: A. 2021; 808 ():140893.

Chicago/Turabian Style

M. Wang; Y. Li; B. Chen; D. Shi; J. Umeda; K. Kondoh; J. Shen. 2021. "The rate-dependent mechanical behavior of CNT-reinforced aluminum matrix composites under tensile loading." Materials Science and Engineering: A 808, no. : 140893.

Journal article
Published: 03 February 2021 in Composites Part B: Engineering
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This paper attempts to study the loading rate effect of interface tensile failure behavior of carbon fiber-epoxy composites toughened with ZnO nanowires (ZnO NWs). ZnO NWs were grown onto woven carbon fiber fabrics through a two-step hydrothermal method, the growth time was carefully controlled to vary the nanowire length. Subsequently, a series of quasi-static and dynamic transverse fiber bundle (TFB) tensile tests were carried out under different loading velocities, ranging from 1 × 10−6 m/s on the universal testing machine to 9 m/s on the electromagnetic Hopkinson bar. A 2D representative volume element (RVE) model has been established to identify the load transfer and failure behavior of the ZnO NW modified interface. The results show that under quasi-static loading, the maximum TFB tensile strength improvement owing to ZnO NWs was about 36.9% and 16.5% when compared with the pristine fibers and the fibers with surface sizing. However, due to the loading rate enhancement of the interface bonding strength, the corresponding values were decreased to 13.9% and 5.0% under dynamic loading. Besides, nanowires with medium length are recommended, because too long nanowires shall reduce the matrix impregnation space between fibers, and the microcracks from the fiber/matrix interface can easily deflect into the matrix along the nanowires. This side-effect may neutralize the enhancement mechanism of ZnO NWs when their length increases to a certain extent.

ACS Style

Xianghao Meng; Jin Li; Hao Cui; Lin Ye; Chao Zhang; Yulong Li. Loading rate effect of the interfacial tensile failure behavior in carbon fiber–epoxy composites toughened with ZnO nanowires. Composites Part B: Engineering 2021, 212, 108676 .

AMA Style

Xianghao Meng, Jin Li, Hao Cui, Lin Ye, Chao Zhang, Yulong Li. Loading rate effect of the interfacial tensile failure behavior in carbon fiber–epoxy composites toughened with ZnO nanowires. Composites Part B: Engineering. 2021; 212 ():108676.

Chicago/Turabian Style

Xianghao Meng; Jin Li; Hao Cui; Lin Ye; Chao Zhang; Yulong Li. 2021. "Loading rate effect of the interfacial tensile failure behavior in carbon fiber–epoxy composites toughened with ZnO nanowires." Composites Part B: Engineering 212, no. : 108676.

Journal article
Published: 26 January 2021 in Crystals
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Heat treatment processing is commonly applied for additively manufactured metal materials, since the as-fabricated material frequently exhibits high internal stress and self-cracking. In this work, a heat treatment route was applied to an additively manufactured Ti-6Al-4V alloy, and its effect on the dynamic compressive behavior was investigated. The experimental results showed that the heat treatment process not only increased the dynamic compressive strength of the material, but also induced a change of the dynamic compressive strength from isotropic to anisotropic. In addition, the strain rate sensitivity of the material was reduced by heat treatment, even though both the as-deposited and heat-treated samples demonstrated positive sensitivity to the loading rate. Microstructural analysis suggested that the grain size and morphology were the same before and after heat treatment, while the internal stress increased due to heat treatment.

ACS Style

Shuangyin Zhang; Yunfei Wang; Tao Suo; Jin Yao; Xin Lin; Weidong Huang; Yulong Li; Jianghua Shen. The Effect of Heat Treatment on Dynamic Properties of an Additively Manufactured Ti-6Al-4V Alloy. Crystals 2021, 11, 111 .

AMA Style

Shuangyin Zhang, Yunfei Wang, Tao Suo, Jin Yao, Xin Lin, Weidong Huang, Yulong Li, Jianghua Shen. The Effect of Heat Treatment on Dynamic Properties of an Additively Manufactured Ti-6Al-4V Alloy. Crystals. 2021; 11 (2):111.

Chicago/Turabian Style

Shuangyin Zhang; Yunfei Wang; Tao Suo; Jin Yao; Xin Lin; Weidong Huang; Yulong Li; Jianghua Shen. 2021. "The Effect of Heat Treatment on Dynamic Properties of an Additively Manufactured Ti-6Al-4V Alloy." Crystals 11, no. 2: 111.

Journal article
Published: 18 October 2020 in Computational Materials Science
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The strength-plasticity trade-off of metallic glass (MG) has not still been effectively overcome. The introduction of shape memory alloy (SMA) is an effective way to improve the mechanical properties of MG. Here, the deformation behavior of amorphous/SMA Cu64Zr36/B2-CuZr nanomultilayers (ASNMs) under tension loading is investigated by molecular dynamics (MD) simulation method. The results show that the peak stresses and flow stress of the ASNMs are greater than those of the monolithic MG regardless of SMA volume fraction. The martensitic transformation (MT) in the SMA phase limits the propagation of shear bands (SBs), avoids a runaway instability, and simultaneously induces plastic strain strengthening. The results also indicate that the plastic deformation mode of ASNMs changes from the interaction of multiple SBs dominated to finally brittle fracture caused by nano-pores aggregation with the increase of SMA volume fraction. This means that the plasticity and strength of ASNMs can be significantly improved by adjusting the volume fraction of SMA. The fruits stem from this paper may provide a valuable guidance and theory route for the design of high-performance MGs.

ACS Style

W.W. Li; H.Y. Song; J.L. Dai; J.Y. Wang; M.R. An; Y.L. Li. Effect of shape memory alloys on the mechanical properties of metallic glasses: A molecular dynamics study. Computational Materials Science 2020, 187, 110088 .

AMA Style

W.W. Li, H.Y. Song, J.L. Dai, J.Y. Wang, M.R. An, Y.L. Li. Effect of shape memory alloys on the mechanical properties of metallic glasses: A molecular dynamics study. Computational Materials Science. 2020; 187 ():110088.

Chicago/Turabian Style

W.W. Li; H.Y. Song; J.L. Dai; J.Y. Wang; M.R. An; Y.L. Li. 2020. "Effect of shape memory alloys on the mechanical properties of metallic glasses: A molecular dynamics study." Computational Materials Science 187, no. : 110088.

Journal article
Published: 08 October 2020 in Physica B: Condensed Matter
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The inadequate bonding strength of graphene and metal matrix is a major challenge to improve the mechanical properties of graphene metal-matrix composites. Here, molecular dynamics simulation is performed to investigate the effect of layer thickness on the mechanical properties of the nickel-coated graphene-reinforced aluminum (NGR-Al) matrix nano-multilayers (NMs) under uniaxial tension and compression load. The results show that the Ni coating on the surface of graphene is an effective method to ameliorate the load transfer ability between graphene and metal matrix. There is a critical layer thickness above which the tensile yield strength and the layer thickness obey the Hall-Petch (HP) relation, and under which the inverse HP relation is followed. The results indicate that compared with pure Al, the introduction of Ni-coated graphene makes the sample have a significant plastic strain strengthening effect under compression load, and the smaller the layer thickness is, the better the strengthening effect is.

ACS Style

R.Q. Han; H.Y. Song; J.Y. Wang; Y.L. Li. Strengthening mechanism of Al matrix composites reinforced by nickel-coated graphene: Insights from molecular dynamics simulation. Physica B: Condensed Matter 2020, 601, 412620 .

AMA Style

R.Q. Han, H.Y. Song, J.Y. Wang, Y.L. Li. Strengthening mechanism of Al matrix composites reinforced by nickel-coated graphene: Insights from molecular dynamics simulation. Physica B: Condensed Matter. 2020; 601 ():412620.

Chicago/Turabian Style

R.Q. Han; H.Y. Song; J.Y. Wang; Y.L. Li. 2020. "Strengthening mechanism of Al matrix composites reinforced by nickel-coated graphene: Insights from molecular dynamics simulation." Physica B: Condensed Matter 601, no. : 412620.

Journal article
Published: 26 August 2020 in International Journal of Impact Engineering
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This paper conducts a combined compression-shear test on honeycombs and Kelvin foams to compare their yield envelopes. The honeycomb and foam specimens with a similar relative density are fabricated by using the additive manufacturing technique. The quasi-static and dynamic crushing behaviors under combined shear-compression are investigated by employing a universal testing machine and a rotatable Hopkinson bar system, respectively. Five loading angles ranging from 0° to 50° are considered. Results reveal that the normal strengths of both honeycomb and Kelvin foam decrease while the shear strengths increase with the loading angle increasing. Moreover, honeycombs change the deformation mode from the progressive folding mode to the global rotation mode while Kelvin foams maintain the layered folding mode as the loading angle increases. Therefore, honeycombs show the normal strength decreasing more sharply than Kelvin foams. As a result, although honeycombs possess higher normal strengths than Kelvin foams under pure compression, the difference becomes smaller with the increase of loading angle. There is a cross point on the macroscopic yield envelopes of honeycomb and Kelvin foam. At this point, honeycomb and Kelvin foam possess the same normal and shear strengths. Moreover, the dynamic yield envelopes of both honeycombs and Kelvin foams possess an almost isotropic expansion of quasi-static envelopes due to the loading rate effect. These yield envelopes provide design criteria for cellular materials to withstand any applied shear/compressive stress state.

ACS Style

Yu Duan; Zhiyong Liu; Xianhang Zhao; Naidan Hou; Bing Du; Huifang Liu; Zhenqiang Zhao; Bing Hou; Yulong Li; Lev N. Rabinskiy. Crushing behavior of honeycomb vs. foam under combined shear-compression loading. International Journal of Impact Engineering 2020, 146, 103696 .

AMA Style

Yu Duan, Zhiyong Liu, Xianhang Zhao, Naidan Hou, Bing Du, Huifang Liu, Zhenqiang Zhao, Bing Hou, Yulong Li, Lev N. Rabinskiy. Crushing behavior of honeycomb vs. foam under combined shear-compression loading. International Journal of Impact Engineering. 2020; 146 ():103696.

Chicago/Turabian Style

Yu Duan; Zhiyong Liu; Xianhang Zhao; Naidan Hou; Bing Du; Huifang Liu; Zhenqiang Zhao; Bing Hou; Yulong Li; Lev N. Rabinskiy. 2020. "Crushing behavior of honeycomb vs. foam under combined shear-compression loading." International Journal of Impact Engineering 146, no. : 103696.

Journal article
Published: 29 July 2020 in Composites Science and Technology
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Graded foams show great potential in impact protection and blast resistance applications but a limited experimental study on their compressive behavior has been reported. Thus, this paper investigates the gradient effect on the compressive behavior of foams experimentally and numerically. The cell size graded foam (SGF) and the cell-wall thickness graded foam (TGF) are both built by the Voronoi method and then fabricated by the additive manufacturing technique. Meanwhile, uniform foams with different cell sizes (SUF) and cell-wall thicknesses (TUF) are also produced to be compared with graded foams. Quasi-static and dynamic compressive tests are conducted respectively by using a universal testing device and a direct-impact Hopkinson pressure bar. Experimental results reveal that SGFs deform continuously from lower to higher density regions and hence possess a gradually increasing plateau stage in the stress-strain curve. TGFs show three stepwise plateau stages because of their three layers with different cell-wall thicknesses. Moreover, SUFs and TUFs with constant relative density present similar mechanical properties despite their different cell morphologies. Several empirical formulae are proposed for uniform foams and fit well with experimental data. Further simulation is verified by experimental results and indicates that TGFs with adequate layers also possess a gradually increasing plateau stage just like SGFs. It means that the strength of each layer in a graded foam depends on its local density rather than cell morphology.

ACS Style

Yu Duan; Yi Ding; Zhiyong Liu; Naidan Hou; Xianhang Zhao; Huifang Liu; Zhenqiang Zhao; Bing Hou; Yulong Li. Effects of cell size vs. cell-wall thickness gradients on compressive behavior of additively manufactured foams. Composites Science and Technology 2020, 199, 108339 .

AMA Style

Yu Duan, Yi Ding, Zhiyong Liu, Naidan Hou, Xianhang Zhao, Huifang Liu, Zhenqiang Zhao, Bing Hou, Yulong Li. Effects of cell size vs. cell-wall thickness gradients on compressive behavior of additively manufactured foams. Composites Science and Technology. 2020; 199 ():108339.

Chicago/Turabian Style

Yu Duan; Yi Ding; Zhiyong Liu; Naidan Hou; Xianhang Zhao; Huifang Liu; Zhenqiang Zhao; Bing Hou; Yulong Li. 2020. "Effects of cell size vs. cell-wall thickness gradients on compressive behavior of additively manufactured foams." Composites Science and Technology 199, no. : 108339.

Journal article
Published: 29 May 2020 in Materials Chemistry and Physics
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The effect of amorphous phase CuZr on the plastic deformation behavior of nanopolycrystal Cu is investigated using molecular dynamics simulation. The results show that the introduction of amorphous phase can effectively enhance the plasticity of nanopolycrystal Cu owing to the cooperation interactions between amorphous and crystalline phases. The results also indicate that reducing grain size and increasing amorphous boundary (AB) spacing are equivalent to improving the plasticity of crystalline/amorphous Cu/CuZr nanocomposites, and the deformation mechanisms of dual-phase nanostructure Cu/CuZr composites obviously depend on grain size and AB spacing.

ACS Style

H.Y. Song; B.B. Duan; Y.J. Wang; M.R. An; Y.L. Li. Enhanced plasticity by introducing amorphous phase in nanopolycrystal Cu: A molecular dynamics study. Materials Chemistry and Physics 2020, 253, 123254 .

AMA Style

H.Y. Song, B.B. Duan, Y.J. Wang, M.R. An, Y.L. Li. Enhanced plasticity by introducing amorphous phase in nanopolycrystal Cu: A molecular dynamics study. Materials Chemistry and Physics. 2020; 253 ():123254.

Chicago/Turabian Style

H.Y. Song; B.B. Duan; Y.J. Wang; M.R. An; Y.L. Li. 2020. "Enhanced plasticity by introducing amorphous phase in nanopolycrystal Cu: A molecular dynamics study." Materials Chemistry and Physics 253, no. : 123254.

Journal article
Published: 14 March 2020 in Chinese Journal of Aeronautics
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Uncontained Engine Rotor Failure (UERF) can cause a catastrophic failure of an aircraft, and the quantitative assessment of the hazards related to UERF is a very important part of safety analysis. However, the procedure for hazard quantification of UERF recommended by the Federal Aviation Administration in advisory circular AC20-128A is cumbersome, as it involves building auxiliary lines and curve projections. To improve the efficiency and general applicability of the risk angle calculation, a boundary discretization method is developed that involves discretizing the geometry of the target part/structure into node points and calculating the risk angles numerically by iterating a particular algorithm over each node point. The improved efficiency and excellent accuracy for the developed algorithm was validated through a comparison with manual solutions for the hazard quantification of the engine nacelle structures of a passenger aircraft using the guidance in AC20-128A. To further demonstrate the applicability of the boundary discretization method, the proposed algorithm was used to examine the influence of the target size and the distance between the target and rotor on the hazard probability.

ACS Style

Zhenqiang Zhao; Peng Liu; Yan Liu; Chao Zhang; Yulong Li. Highly efficient computation method for hazard quantification of uncontained rotor failure. Chinese Journal of Aeronautics 2020, 33, 1980 -1990.

AMA Style

Zhenqiang Zhao, Peng Liu, Yan Liu, Chao Zhang, Yulong Li. Highly efficient computation method for hazard quantification of uncontained rotor failure. Chinese Journal of Aeronautics. 2020; 33 (7):1980-1990.

Chicago/Turabian Style

Zhenqiang Zhao; Peng Liu; Yan Liu; Chao Zhang; Yulong Li. 2020. "Highly efficient computation method for hazard quantification of uncontained rotor failure." Chinese Journal of Aeronautics 33, no. 7: 1980-1990.

Journal article
Published: 09 March 2020 in International Journal of Mechanical Sciences
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Functional Graded Materials are widely developed in the past decades and graded foams are introduced recently because such graded foams can exhibit better energy absorption capacities than the uniform ones of the same weight. Meanwhile, very limited investigation on their constitutive model has been reported. Therefore, this study aims to investigate experimentally the quasi-static compressive behavior of graded foams and then establish a constitutive model based on the property of the homologous uniform foams. For this purpose, uniform foams with six different cell sizes and graded foams with twelve different gradient distributions are manufactured by using the additive manufacturing technique. Comparing with uniform foams, graded foams with similar relative density show a similar behavior in elastic and densification stages. The main difference lies in the fact that graded foams possess a hardening plateau stage rather than a constant one. Such hardening behavior is due to a successive collapse from the weakest region to the strongest region. In other words, graded foams exhibit successive plateau stresses of their component layers. Thus, the graded-foam property can be modeled using the mechanical properties of uniform-foam component layers. Indeed, we first determine the Gibson-Ashby relations for uniform foams from experimental data. Then, an elastic, plastic-hardening, locking model for graded foams is built from these uniform-foam Gibson-Ashby relations. This constitutive model can be used for predicting the quasi-static compressive responses of various graded foams, and verified by our experimental data and some published results. A finite element simulation is also conducted to verify the validity of this model. On the basis of this model, it is possible to tailor the mechanical properties of graded foams for various engineering applications without conducting experimental studies.

ACS Style

Y Duan; Xianhang Zhao; Bing Du; Xiaopeng Shi; Han Zhao; Bing Hou; Yulong Li. Quasi-static compressive behavior and constitutive model of graded foams. International Journal of Mechanical Sciences 2020, 177, 105603 .

AMA Style

Y Duan, Xianhang Zhao, Bing Du, Xiaopeng Shi, Han Zhao, Bing Hou, Yulong Li. Quasi-static compressive behavior and constitutive model of graded foams. International Journal of Mechanical Sciences. 2020; 177 ():105603.

Chicago/Turabian Style

Y Duan; Xianhang Zhao; Bing Du; Xiaopeng Shi; Han Zhao; Bing Hou; Yulong Li. 2020. "Quasi-static compressive behavior and constitutive model of graded foams." International Journal of Mechanical Sciences 177, no. : 105603.

Journal article
Published: 10 February 2020 in Journal of Non-Crystalline Solids
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The effect of the introduction of {101¯2} twin boundary (TB) on the mechanical behavior of dual-phase amorphous/crystalline (A/C) MgAl/Mg alloys is investigated by molecular dynamics simulation. The results show that the introduction of TB can activate dislocation slip and HCP→FCC phase transformation, which can significantly facilitate the synergy interaction between the crystalline and amorphous phases and enhance the plastic deformability of the dual-phase Mg alloys. However, TB increases the plasticity of dual-phase Mg alloys at the expense of strength. To design high performance Mg alloys, we also study the effect of the spacing between TB and ACI (STA) on the mechanical properties of the dual-phase Mg alloys. It is worth highlighting that the yield strength of the dual-phase Mg alloys increases with the increase of STA. The simulations indicate that the high-strength and high-plasticity dual-phase Mg alloys can be obtained by introducing TBs and optimizing STAs.

ACS Style

K. Zhang; H.Y. Song; Q. Deng; Y.L. Li. Interaction mechanism between twin boundary and crystalline/amorphous interface in dual-phase Mg alloys. Journal of Non-Crystalline Solids 2020, 534, 119954 .

AMA Style

K. Zhang, H.Y. Song, Q. Deng, Y.L. Li. Interaction mechanism between twin boundary and crystalline/amorphous interface in dual-phase Mg alloys. Journal of Non-Crystalline Solids. 2020; 534 ():119954.

Chicago/Turabian Style

K. Zhang; H.Y. Song; Q. Deng; Y.L. Li. 2020. "Interaction mechanism between twin boundary and crystalline/amorphous interface in dual-phase Mg alloys." Journal of Non-Crystalline Solids 534, no. : 119954.

Journal article
Published: 04 December 2019 in Journal of the Mechanics and Physics of Solids
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One of the most important issues related to dynamic shear localization is the correlation among the stress collapse, temperature elevation and adiabatic shear band (ASB) formation. In this work, the adiabatic shear failure process of pure titanium was investigated by dynamic shear-compression tests synchronically combined with high-speed photography and infrared temperature measurement. The time sequence of important events such as stress collapse, ASB initiation, temperature rise and crack formation was recorded. The key characteristics of ASB, such as width, critical strain, temperature, propagation speed and cooling rate were systematically studied. The maximum propagation velocity of ASB is found in this work to be about 1900 m/s, about 0.6Cs (Cs is the shear wave speed). The maximum temperature within ASB is in the range of 350–650 °C, while the material close to ASB is also heated. The cooling rate of ASB is on the order of 106 °C/s, indicating that it needs a few hundreds of microseconds for the ASB to cool down to the ambient temperature. One important observation is that the apparent temperature rise occurs after ASB initiation, which indicates that it might not be the causation but the consequences of ASB. Further efforts are called for confirmation of this notion because of its significance.

ACS Style

Yazhou Guo; Qichao Ruan; Shengxin Zhu; Q. Wei; Jianan Lu; Bo Hu; Xihui Wu; Yulong Li. Dynamic failure of titanium: Temperature rise and adiabatic shear band formation. Journal of the Mechanics and Physics of Solids 2019, 135, 103811 .

AMA Style

Yazhou Guo, Qichao Ruan, Shengxin Zhu, Q. Wei, Jianan Lu, Bo Hu, Xihui Wu, Yulong Li. Dynamic failure of titanium: Temperature rise and adiabatic shear band formation. Journal of the Mechanics and Physics of Solids. 2019; 135 ():103811.

Chicago/Turabian Style

Yazhou Guo; Qichao Ruan; Shengxin Zhu; Q. Wei; Jianan Lu; Bo Hu; Xihui Wu; Yulong Li. 2019. "Dynamic failure of titanium: Temperature rise and adiabatic shear band formation." Journal of the Mechanics and Physics of Solids 135, no. : 103811.

Journal article
Published: 29 November 2019 in Composites Part B: Engineering
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The dynamic responses of continuous graded foams are investigated experimentally and numerically. The Voronoi model is employed to construct foam specimens. Graded foams with different gradients and uniform foams with different relative densities are fabricated by the additive manufacturing technique. Experimental results indicate that the gradient distribution notably influences the mechanical properties of foams under a low-velocity impact (about 20 m/s). If the lowest density region is close to one end of a specimen, this end will present a gradually increasing plateau stage in the stress-strain curve. While if the highest density region is placed to one end, this end will exhibit a sharp fluctuation before the gradually increasing plateau stage. Besides, the crushing behaviors of graded and uniform foams are compared to propose an elastic, collapse, plastic-hardening, densification (E-C-PH-D) constitutive model. The E-C-PH-D model can predict the dynamic mechanical properties of graded foams with successive layered deformation. A high-velocity impact (100 m/s) study is also carried out by the numerical simulation. The impact end of graded foams shows distinct higher stresses than the support end due to the shock wave effect. The combined effects of gradient and shock wave on the crushing responses of foams are discussed systematically.

ACS Style

Yu Duan; Xianhang Zhao; Zhiyong Liu; Naidan Hou; Huifang Liu; Bing Du; Bing Hou; Yulong Li. Dynamic response of additively manufactured graded foams. Composites Part B: Engineering 2019, 183, 107630 .

AMA Style

Yu Duan, Xianhang Zhao, Zhiyong Liu, Naidan Hou, Huifang Liu, Bing Du, Bing Hou, Yulong Li. Dynamic response of additively manufactured graded foams. Composites Part B: Engineering. 2019; 183 ():107630.

Chicago/Turabian Style

Yu Duan; Xianhang Zhao; Zhiyong Liu; Naidan Hou; Huifang Liu; Bing Du; Bing Hou; Yulong Li. 2019. "Dynamic response of additively manufactured graded foams." Composites Part B: Engineering 183, no. : 107630.

Journal article
Published: 01 November 2019 in Polymers
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The impact resistance of fiber-reinforced polymer composites is a critical concern for structure design in aerospace applications. In this work, experiments were conducted to evaluate the impact performance of four types of composite panels, using a gas-gun test system. Computational efficient finite element models were developed to model the high-speed ballistic impact behavior of laminate and textile composites. The models were first validated by comparing the critical impact threshold and the failure patterns against experimental results. The damage progression and energy evolution behavior were combined to analyze the impact failure process of the composite panels. Numerical parametric studies were designed to investigate the sensitivity of impact resistance against impact attitude, including impact deflection angles and projectile deflection angles, which provide a comprehensive understanding of the damage tolerance of the composite panels. The numerical results elaborate the different impact resistances for laminate and textile composites and their different sensitivities to deflection angles.

ACS Style

Jun Xing; Chunlin Du; Xin He; Zhenqiang Zhao; Chao Zhang; Yulong Li; Xing; Du; He; Zhao; Li. Finite Element Study on the Impact Resistance of Laminated and Textile Composites. Polymers 2019, 11, 1798 .

AMA Style

Jun Xing, Chunlin Du, Xin He, Zhenqiang Zhao, Chao Zhang, Yulong Li, Xing, Du, He, Zhao, Li. Finite Element Study on the Impact Resistance of Laminated and Textile Composites. Polymers. 2019; 11 (11):1798.

Chicago/Turabian Style

Jun Xing; Chunlin Du; Xin He; Zhenqiang Zhao; Chao Zhang; Yulong Li; Xing; Du; He; Zhao; Li. 2019. "Finite Element Study on the Impact Resistance of Laminated and Textile Composites." Polymers 11, no. 11: 1798.

Journal article
Published: 09 September 2019 in International Journal of Mechanical Sciences
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Recent development in additive manufacturing (AM) technique has led to advances in fabricating foams with desired internal structures. By using AM technique, we fabricate random foams (regularity = 0.0–0.8) and Kelvin foams (regularity = 1.0) with similar relative densities. The effects of cell regularity on the mechanical properties and deformation mechanisms of Voronoi foams are investigated experimentally and numerically. A series of quasi-static and dynamic compressive tests are performed and the strain distributions are obtained by the digital imaging correlation method. Experimental results indicate that random foams have lower collapse stresses and plateau stresses than Kelvin foams. It is due to that random foams show random localized deformations and cell-wall tearing failures while Kelvin foams exhibit layered deformation bands and no tearing failure. To decouple the two deformation and failure mechanisms affecting the Voronoi-foam mechanical properties, further numerical investigations without introducing tearing failure are carried out and random foams are found to have lower collapse stresses but similar plateau stresses with Kelvin foams. Therefore, it can be concluded that random foams have randomly-distributed localized deformations and thus can always mitigate the collapse stress, but may lower the plateau stress compared with Kelvin foams because of their cell-wall tearing failures. In addition, the cell regularity (0.0–0.8) has no significant influence on the mechanical properties of foams based on all experimental and numerical data.

ACS Style

Yu Duan; Bing Du; Xianhang Zhao; Naidan Hou; Xiaopeng Shi; Bing Hou; Yulong Li. The cell regularity effects on the compressive responses of additively manufactured Voronoi foams. International Journal of Mechanical Sciences 2019, 164, 105151 .

AMA Style

Yu Duan, Bing Du, Xianhang Zhao, Naidan Hou, Xiaopeng Shi, Bing Hou, Yulong Li. The cell regularity effects on the compressive responses of additively manufactured Voronoi foams. International Journal of Mechanical Sciences. 2019; 164 ():105151.

Chicago/Turabian Style

Yu Duan; Bing Du; Xianhang Zhao; Naidan Hou; Xiaopeng Shi; Bing Hou; Yulong Li. 2019. "The cell regularity effects on the compressive responses of additively manufactured Voronoi foams." International Journal of Mechanical Sciences 164, no. : 105151.

Journal article
Published: 05 July 2019 in Journal of Non-Crystalline Solids
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Dual-phase nanostructured amorphous/crystalline (A/C) model is an effective method to improve the mechanical properties of Mg alloys. However, the interaction behavior between A/C interface (ACI) and various defects is still unclear. Here, the interaction mechanisms between the basal/prismatic interface (BPI) and ACI of dual-phase nanoscale A/C MgAl/Mg alloys are investigated by molecular dynamics simulation method. The results indicate that the ACIs have a significant Peach-Koehler (attractive or repulsive) force to govern the activation of interfacial dislocations in BPI. When the spacing between ACI and BPI (SAB) is less than 12.0 nm, it is found that the attractive force plays a dominant role in interfacial dislocation activation. On the contrary, the repulsive force has an effect on the activation of dislocations. The results also show that the maximum peak strain increases almost linearly with increasing SAB, and the maximum peak strain delay is attributed to the strain contributed by BPIs migration.

ACS Style

H.Y. Song; K. Zhang; M.R. An; L. Wang; Meixia Xiao; Y.L. Li. Atomic simulation of interaction mechanism between basal/prismatic interface and amorphous/crystalline interface of dual-phase magnesium alloys. Journal of Non-Crystalline Solids 2019, 521, 119550 .

AMA Style

H.Y. Song, K. Zhang, M.R. An, L. Wang, Meixia Xiao, Y.L. Li. Atomic simulation of interaction mechanism between basal/prismatic interface and amorphous/crystalline interface of dual-phase magnesium alloys. Journal of Non-Crystalline Solids. 2019; 521 ():119550.

Chicago/Turabian Style

H.Y. Song; K. Zhang; M.R. An; L. Wang; Meixia Xiao; Y.L. Li. 2019. "Atomic simulation of interaction mechanism between basal/prismatic interface and amorphous/crystalline interface of dual-phase magnesium alloys." Journal of Non-Crystalline Solids 521, no. : 119550.

Conference paper
Published: 08 June 2019 in Lecture Notes in Electrical Engineering
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In this paper, bulk notched sample was designed to introduce crack and shear band interaction in bulk metallic glasses (BMGs). Deformation morphologies on the polished surface demonstrate that crack in BMGs might be deflected or arrested by surrounding shear bands. Distinct fracture morphologies could be observed in the interaction-induced soften region, indicating a transition of the mechanism dominating crack propagation. A hyperelastic model was used to discuss crack and shear band interaction. It’s proved that crack propagation is dominated by local elastic properties rather than global linear elastic properties due to shear induced softening and multiple shear bands. Our study suggests that multiple shear bands with a proper spacing are helpful to inhibit catastrophic crack propagation and to improve the plasticity of bulk metallic glasses.

ACS Style

Bingjin Li; Ding Zhou; Bing Hou; Shuangyin Zhang; Yulong Li. Crack and Shear Band Interaction in Bulk Metallic Glasses. Lecture Notes in Electrical Engineering 2019, 2992 -3001.

AMA Style

Bingjin Li, Ding Zhou, Bing Hou, Shuangyin Zhang, Yulong Li. Crack and Shear Band Interaction in Bulk Metallic Glasses. Lecture Notes in Electrical Engineering. 2019; ():2992-3001.

Chicago/Turabian Style

Bingjin Li; Ding Zhou; Bing Hou; Shuangyin Zhang; Yulong Li. 2019. "Crack and Shear Band Interaction in Bulk Metallic Glasses." Lecture Notes in Electrical Engineering , no. : 2992-3001.

Journal article
Published: 16 May 2019 in International Journal of Impact Engineering
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The effects of the relative density and loading rate on the compressive response, deformation pattern and energy absorption of 3D printed polymeric Kelvin foams are investigated experimentally and computationally. A high-speed camera is used to record the loading processes of different cubic specimens, and the deformation distribution is calculated using the digital imaging correlation (DIC) method. Experimental results show that the elastic modulus and plateau stress increase with increasing relative density, which obeys the Gibson-Ashby polynomial scaling law. Four different deformation modes are observed in experiments for the specimens with different relative densities and at different loading rates. Further numerical results indicate the presence of a critical relative density, below which the Kelvin foams deform primarily by cell edges bending, and beyond which the cell membranes stretching dominates. It is also found that the position of the deformation bands is dominated by the loading rate. These findings can be used to explain the existing of four deformation modes observed in experiments. In conclusion, a mode classification map is proposed to clarify the effects of the relative density and loading rate on the deformation modes of Kelvin foams based on the experimental and numerical results.

ACS Style

Yu Duan; Bing Du; Xiaopeng Shi; Bing Hou; Yulong Li. Quasi-static and dynamic compressive properties and deformation mechanisms of 3D printed polymeric cellular structures with Kelvin cells. International Journal of Impact Engineering 2019, 132, 103303 .

AMA Style

Yu Duan, Bing Du, Xiaopeng Shi, Bing Hou, Yulong Li. Quasi-static and dynamic compressive properties and deformation mechanisms of 3D printed polymeric cellular structures with Kelvin cells. International Journal of Impact Engineering. 2019; 132 ():103303.

Chicago/Turabian Style

Yu Duan; Bing Du; Xiaopeng Shi; Bing Hou; Yulong Li. 2019. "Quasi-static and dynamic compressive properties and deformation mechanisms of 3D printed polymeric cellular structures with Kelvin cells." International Journal of Impact Engineering 132, no. : 103303.