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Guangjian Peng
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China

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Journal article
Published: 10 July 2021 in International Journal of Solids and Structures
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The indentation of a microcapsule with a spherical indenter is an effective technique to evaluate the elastic properties of microcapsule shells. The spherical indentation of a microcapsule could be modelled as a microsphere with core–shell structure indented by a rigid sphere. Based on the assumption that the deformed pattern of microcapsule is axisymmetric at small indentation displacement, the deformed profile of shell was divided into five regions according to curvature change. The strain energy of shell was then obtained by adding the bending and membrane strain energy of each region together. The strain energy of core is mainly caused by the volume change of core. The microcapsule was treated as a system and its total potential energy is the sum of the strain energy of shell and core minus the work done by external load. Applying the minimum total potential principle, a spherical indentation model that establishes the relationship among the indentation load, the indentation displacement, and the elastic properties and geometric parameters of microcapsules was proposed. Experiments were carried out on PMMA microcapsules with different dimensions to validate the newly proposed spherical indentation model. The average value of elastic moduli obtained by conventional nanoindentation tests on bulk PMMA and the cross-section of PMMA shell was regarded as the nominal value. The average elastic modulus of PMMA shells determined by the proposed model shows a good agreement with the nominal value. Finally, finite element simulations combined with the proposed model were used to predict the indentation behaviors of microcapsules with different dimensions.

ACS Style

Yiheng Sun; Guangjian Peng; Yahao Hu; Guijing Dou; Peijian Chen; Taihua Zhang. Spherical indentation model for evaluating the elastic properties of the shell of microsphere with core-shell structure. International Journal of Solids and Structures 2021, 230-231, 111159 .

AMA Style

Yiheng Sun, Guangjian Peng, Yahao Hu, Guijing Dou, Peijian Chen, Taihua Zhang. Spherical indentation model for evaluating the elastic properties of the shell of microsphere with core-shell structure. International Journal of Solids and Structures. 2021; 230-231 ():111159.

Chicago/Turabian Style

Yiheng Sun; Guangjian Peng; Yahao Hu; Guijing Dou; Peijian Chen; Taihua Zhang. 2021. "Spherical indentation model for evaluating the elastic properties of the shell of microsphere with core-shell structure." International Journal of Solids and Structures 230-231, no. : 111159.

Journal article
Published: 20 August 2020 in Coatings
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Zamak 3 alloy treatment by sliding-friction treatment (SFT) was investigated by nanoindentation to explore the influence of microstructure and strain rate on nanoscale deformation at room temperature. The results show that obvious material softening occurs in the ultrafine-grained (UFG) Zn alloy and strain-hardening happens in the twinning-deformed layer, respectively. It can be concluded that almost constant values of V in the UFG Zn alloy contribute to the dislocations moving along the grain boundary (GB) not cross the grain interior. In the twinning-deformed layer, the highly frequent dislocation–twinning boundary (TB) interactions are responsible for subsequent inverse Cottrell–Stokes at lower stress, which is quite different from dislocation–dislocation reaction inside the grain in their coarse-grained (CG) counterpart.

ACS Style

Jiangjiang Hu; Shuo Sun; Wei Zhang; Guangjian Peng; Shuang Han; Xu Sun; Yusheng Zhang; Taihua Zhang. Softening Behaviors of Severely Deformed Zn Alloy Studied by the Nanoindentation. Coatings 2020, 10, 803 .

AMA Style

Jiangjiang Hu, Shuo Sun, Wei Zhang, Guangjian Peng, Shuang Han, Xu Sun, Yusheng Zhang, Taihua Zhang. Softening Behaviors of Severely Deformed Zn Alloy Studied by the Nanoindentation. Coatings. 2020; 10 (9):803.

Chicago/Turabian Style

Jiangjiang Hu; Shuo Sun; Wei Zhang; Guangjian Peng; Shuang Han; Xu Sun; Yusheng Zhang; Taihua Zhang. 2020. "Softening Behaviors of Severely Deformed Zn Alloy Studied by the Nanoindentation." Coatings 10, no. 9: 803.

Journal article
Published: 17 June 2020 in Measurement
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To evaluate the mechanical properties of structures in service, a portable micro-indentation device was developed and built. The basic design principle of the indentation device, i.e. measurement of the indentation depth and the indentation force with sufficient accuracy, was discussed. To avoid using load cell to decrease the machine compliance, a new method that using the current through voice coil motor to calculate the indentation force was proposed. After analyzing the equivalent mechanical model of the developed device, an eddy current displacement sensor was installed on the device to improve the measurement accuracy of indentation depth. Indentation tests were performed on polymethylmethacrylate (PMMA) and unplasticized polyvinyl chloride (UPVC) with the developed device and the commercial indentation device ZHU2.5 to demonstrate the validity and accuracy of the developed micro-indentation device.

ACS Style

Guangjian Peng; Fenglei Xu; Jianfeng Chen; Yahao Hu; Huadong Wang; Taihua Zhang. A cost-effective voice coil motor-based portable micro-indentation device for in situ testing. Measurement 2020, 165, 108105 .

AMA Style

Guangjian Peng, Fenglei Xu, Jianfeng Chen, Yahao Hu, Huadong Wang, Taihua Zhang. A cost-effective voice coil motor-based portable micro-indentation device for in situ testing. Measurement. 2020; 165 ():108105.

Chicago/Turabian Style

Guangjian Peng; Fenglei Xu; Jianfeng Chen; Yahao Hu; Huadong Wang; Taihua Zhang. 2020. "A cost-effective voice coil motor-based portable micro-indentation device for in situ testing." Measurement 165, no. : 108105.

Research article
Published: 28 April 2020 in Langmuir
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Accurate evaluating the shell elastic modulus of microcapsules is of great significance to understanding their performance during production, processing and applications. In this work, micro-compression was employed to investigate the elastic behaviors of a single microcapsule. It was modeled as a microsphere with core-shell structure compressed between two rigid plates. Based on the assumption that the contact pressure between the microsphere and plates obeying parabolic distribution, a micro-compression method derived from the Reissner's theory and modified Hertz contact theory was established to evaluate the shell elastic modulus. Applications were carried out on PMMA microcapsules containing n-octadecane. The average elastic modulus of PMMA shells measured by the proposed method agrees well with that of bulk PMMA sample. Furthermore, the elastic modulus of PMMA shells was found to have size dependence on the diameter of microcapsules. Finally, finite element models combined with the proposed method were constructed to accurately predict the micro-compression behaviors of microcapsules with different sizes.

ACS Style

Guangjian Peng; Yiheng Sun; Guijing Dou; Yahao Hu; Weifeng Jiang; Taihua Zhang. Microcompression Method for Determining the Size-Dependent Elastic Properties of PMMA Microcapsules Containing n-Octadecane. Langmuir 2020, 36, 5176 -5185.

AMA Style

Guangjian Peng, Yiheng Sun, Guijing Dou, Yahao Hu, Weifeng Jiang, Taihua Zhang. Microcompression Method for Determining the Size-Dependent Elastic Properties of PMMA Microcapsules Containing n-Octadecane. Langmuir. 2020; 36 (19):5176-5185.

Chicago/Turabian Style

Guangjian Peng; Yiheng Sun; Guijing Dou; Yahao Hu; Weifeng Jiang; Taihua Zhang. 2020. "Microcompression Method for Determining the Size-Dependent Elastic Properties of PMMA Microcapsules Containing n-Octadecane." Langmuir 36, no. 19: 5176-5185.

Journal article
Published: 27 March 2020 in Metals
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Residual stresses, existed in engineering structures, could significantly influence the mechanical properties of structures. Accurate and non-destructive evaluation of the non-equibiaxial residual stresses in these structures is of great value for predicting their mechanical performance. In this work, investigating the mechanical behaviors of instrumented spherical indentation on stressed samples revealed that non-equibiaxial residual stresses could shift the load-depth curve upwards or downwards and cause the residual indentation imprint to be an elliptical one. Through theoretical, experimental, and finite element (FE) analyses, two characteristic indentation parameters, i.e., the relative change in loading curvature and the asymmetry factor of the residual indentation imprint, were found to have optimal sensitivity to residual stresses at a depth of 0.01R (R is the radius of spherical indenter). With the aid of dimensional analysis and FE simulations, non-equibiaxial residual stresses were quantitatively correlated with these two characteristic indentation parameters. The spherical indentation method was then proposed to evaluate non-equibiaxial residual stress based on these two correlations. Applications were illustrated on metallic samples (AA 7075-T6 and AA 2014-T6) with various introduced stresses. Both the numerical and experimental verifications demonstrated that the proposed method could evaluate non-equibiaxial surface residual stresses with reasonable accuracy.

ACS Style

Guangjian Peng; Fenglei Xu; Jianfeng Chen; Huadong Wang; Jiangjiang Hu; Taihua Zhang. Evaluation of Non-Equibiaxial Residual Stresses in Metallic Materials via Instrumented Spherical Indentation. Metals 2020, 10, 440 .

AMA Style

Guangjian Peng, Fenglei Xu, Jianfeng Chen, Huadong Wang, Jiangjiang Hu, Taihua Zhang. Evaluation of Non-Equibiaxial Residual Stresses in Metallic Materials via Instrumented Spherical Indentation. Metals. 2020; 10 (4):440.

Chicago/Turabian Style

Guangjian Peng; Fenglei Xu; Jianfeng Chen; Huadong Wang; Jiangjiang Hu; Taihua Zhang. 2020. "Evaluation of Non-Equibiaxial Residual Stresses in Metallic Materials via Instrumented Spherical Indentation." Metals 10, no. 4: 440.

Review article
Published: 12 January 2020 in Advances in Polymer Technology
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Phase change materials (PCMs) are gaining increasing attention and becoming popular in the thermal energy storage field. Microcapsules enhance thermal and mechanical performance of PCMs used in thermal energy storage by increasing the heat transfer area and preventing the leakage of melting materials. Nowadays, a large number of studies about PCM microcapsules have been published to elaborate their benefits in energy systems. In this paper, a comprehensive review has been carried out on PCM microcapsules for thermal energy storage. Five aspects have been discussed in this review: classification of PCMs, encapsulation shell materials, microencapsulation techniques, PCM microcapsules’ characterizations, and thermal applications. This review aims to help the researchers from various fields better understand PCM microcapsules and provide critical guidance for utilizing this technology for future thermal energy storage.

ACS Style

Guangjian Peng; Guijing Dou; Yahao Hu; Yiheng Sun; Zhitong Chen. Phase Change Material (PCM) Microcapsules for Thermal Energy Storage. Advances in Polymer Technology 2020, 2020, 1 -20.

AMA Style

Guangjian Peng, Guijing Dou, Yahao Hu, Yiheng Sun, Zhitong Chen. Phase Change Material (PCM) Microcapsules for Thermal Energy Storage. Advances in Polymer Technology. 2020; 2020 ():1-20.

Chicago/Turabian Style

Guangjian Peng; Guijing Dou; Yahao Hu; Yiheng Sun; Zhitong Chen. 2020. "Phase Change Material (PCM) Microcapsules for Thermal Energy Storage." Advances in Polymer Technology 2020, no. : 1-20.

Journal article
Published: 15 March 2019 in MRS Communications
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The finite element simulations show that non-equibiaxial residual stresses (RS) can shift the load–depth curve from the unstressed curve and cause elliptical remnant indentation in spherical indentation. Thus the relative load change between stressed and unstressed samples and the asymmetry of elliptical remnant indentation were employed as characteristic parameters to evaluate the magnitude and directionality of RS. Through theoretical and numerical analysis, the effects of RS on indentation load and remnant impression as well as the affect mechanism were systematically discussed. Finally, two equations which could provide foundations for establishing spherical indentation method to evaluate non-equibiaxial RS were obtained.

ACS Style

Taihua Zhang; Wenqiang Cheng; Guangjian Peng; Yi Ma; Weifeng Jiang; Jiangjiang Hu; Heng Chen. Numerical investigation of spherical indentation on elastic-power-law strain-hardening solids with non-equibiaxial residual stresses. MRS Communications 2019, 9, 360 -369.

AMA Style

Taihua Zhang, Wenqiang Cheng, Guangjian Peng, Yi Ma, Weifeng Jiang, Jiangjiang Hu, Heng Chen. Numerical investigation of spherical indentation on elastic-power-law strain-hardening solids with non-equibiaxial residual stresses. MRS Communications. 2019; 9 (1):360-369.

Chicago/Turabian Style

Taihua Zhang; Wenqiang Cheng; Guangjian Peng; Yi Ma; Weifeng Jiang; Jiangjiang Hu; Heng Chen. 2019. "Numerical investigation of spherical indentation on elastic-power-law strain-hardening solids with non-equibiaxial residual stresses." MRS Communications 9, no. 1: 360-369.

Journal article
Published: 07 March 2019 in Metals
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Friction stir welding (FSW) is a promising welding method for welding dissimilar materials without using welding flux. In the present work, 5A06-H112 and 6061-T651 aluminium alloys were successfully welded by friction stir welding with forced air cooling (FAC) and natural cooling (NC). Nanoindentation tests and microstructure characterisations revealed that forced air cooling, which can accelerate the cooling process and suppress the coarsening of grains and the dissolution of precipitate phases, contributes to strengthening and narrowing the weakest area of the joint. The tensile strength of joints with FAC were commonly improved by 10% compared to those with NC. Scanning electron microscopy (SEM) images of the fracture surface elucidated that FSW with FAC tended to increase the number and reduce the size of the dimples. These results demonstrated the advantages of FSW with FAC in welding heat-sensitive materials and provide fresh insight into welding industries.

ACS Style

Guangjian Peng; Qi Yan; Jiangjiang Hu; Peijian Chen; Zhitong Chen; Taihua Zhang. Effect of Forced Air Cooling on the Microstructures, Tensile Strength, and Hardness Distribution of Dissimilar Friction Stir Welded AA5A06-AA6061 Joints. Metals 2019, 9, 304 .

AMA Style

Guangjian Peng, Qi Yan, Jiangjiang Hu, Peijian Chen, Zhitong Chen, Taihua Zhang. Effect of Forced Air Cooling on the Microstructures, Tensile Strength, and Hardness Distribution of Dissimilar Friction Stir Welded AA5A06-AA6061 Joints. Metals. 2019; 9 (3):304.

Chicago/Turabian Style

Guangjian Peng; Qi Yan; Jiangjiang Hu; Peijian Chen; Zhitong Chen; Taihua Zhang. 2019. "Effect of Forced Air Cooling on the Microstructures, Tensile Strength, and Hardness Distribution of Dissimilar Friction Stir Welded AA5A06-AA6061 Joints." Metals 9, no. 3: 304.

Journal article
Published: 01 February 2019 in AIP Advances
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ACS Style

Zhitong Chen; Guangjian Peng; Peijian Chen; Yuan Xia; Guang Li. Investigation of the tribological behavior of chromium aluminum silicon nitride coatings via both scratch sliding test and FEM simulation. AIP Advances 2019, 9, 025116 .

AMA Style

Zhitong Chen, Guangjian Peng, Peijian Chen, Yuan Xia, Guang Li. Investigation of the tribological behavior of chromium aluminum silicon nitride coatings via both scratch sliding test and FEM simulation. AIP Advances. 2019; 9 (2):025116.

Chicago/Turabian Style

Zhitong Chen; Guangjian Peng; Peijian Chen; Yuan Xia; Guang Li. 2019. "Investigation of the tribological behavior of chromium aluminum silicon nitride coatings via both scratch sliding test and FEM simulation." AIP Advances 9, no. 2: 025116.

Journal article
Published: 01 December 2012 in Polymer Testing
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ACS Style

Guangjian Peng; Taihua Zhang; Yihui Feng; Yong Huan. Determination of shear creep compliance of linear viscoelastic-plastic solids by instrumented indentation. Polymer Testing 2012, 31, 1038 -1044.

AMA Style

Guangjian Peng, Taihua Zhang, Yihui Feng, Yong Huan. Determination of shear creep compliance of linear viscoelastic-plastic solids by instrumented indentation. Polymer Testing. 2012; 31 (8):1038-1044.

Chicago/Turabian Style

Guangjian Peng; Taihua Zhang; Yihui Feng; Yong Huan. 2012. "Determination of shear creep compliance of linear viscoelastic-plastic solids by instrumented indentation." Polymer Testing 31, no. 8: 1038-1044.

Journal article
Published: 09 May 2012 in Journal of Materials Research
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Lee and Radok [J. Appl. Mech. 27, 438 (1960)] derived the solution for the indentation of a smooth rigid indenter on a linear viscoelastic half-space. They had pointed out that their solution was valid only for regimes where contact area did not decrease with time. In this article, a large number of finite element simulations and one typical experiment demonstrate that Lee-Radok solution is approximately valid for the case of reducing contact area. Based on this finding, three semiempirical methods, i.e., Step-Ramp method, Ramp-Ramp method and Sine-Sine method, are proposed for determination of shear creep compliance using the data of both loading and unloading segments. The reliability of these methods is acceptable within certain tolerance.

ACS Style

Guangjian Peng; Taihua Zhang; Yihui Feng; Rong Yang. Determination of shear creep compliance of linear viscoelastic solids by instrumented indentation when the contact area has a single maximum. Journal of Materials Research 2012, 27, 1565 -1572.

AMA Style

Guangjian Peng, Taihua Zhang, Yihui Feng, Rong Yang. Determination of shear creep compliance of linear viscoelastic solids by instrumented indentation when the contact area has a single maximum. Journal of Materials Research. 2012; 27 (12):1565-1572.

Chicago/Turabian Style

Guangjian Peng; Taihua Zhang; Yihui Feng; Rong Yang. 2012. "Determination of shear creep compliance of linear viscoelastic solids by instrumented indentation when the contact area has a single maximum." Journal of Materials Research 27, no. 12: 1565-1572.