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Prof. María Henar Miguélez
Miguélez Mechanical Engineering, University Carlos III of Madrid, 28903 Getafe, Madrid, Spain

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0 Advanced Materials
0 Modeling
0 Manufacturing technologies
0 Materials mechanics

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Journal article
Published: 19 July 2021 in Composite Structures
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The mechanical performance of composite materials is strongly dependent on its microstructure. Efficient design of composites requires proper estimation of the effect of the microstructure on residual stresses that arising from cooling due to manufacturing temperature. The study of the stresses and damage in fibres interface and its relationship with geometrical distribution of the fibres can contribute to a better comprehension of the mechanical response of the composite. We use 2D numerical models to represent a composite material reinforced with longitudinal fibres. The mechanical behaviour is analysed taking into account the cooling effect and tension/compression transverse loading. We have generated a range of virtual microstructures, characterized by the microstructure randomness, to study the influence of the fiber randomness on the damage initiation. Damage initiation at fibres interfaces has been estimated from the stresses induced at the interface, both in the whole structure and for individual fibers. As expected, a strong effect of the randomness of the fiber arrangement on the damage initiation has been found. For all microstructures and loading modes, higher values of microstructure randomness results in earlier damage development. Normal and shear stresses at individual fibre interfaces have been analysed under tension and compression loading. In tension, normal stress at the fiber interface fully dominates the interfacial damage initiation. In compression, damage is almost completely dominated by the interfacial tangential stress. In compression, localized plasticity develops simultaneously with damage initiation whereas in tension, damage initiation occurs at a stress three times lower than the required for the onset of plasticity. The maximum shear and normal stresses around individual fibers are strongly affected by the local neighborhood.

ACS Style

Miguel Marco; Eugenio Giner; María Henar Miguélez; David González. On the effect of geometrical fiber arrangement on damage initiation in CFRPs under transverse tension and compression. Composite Structures 2021, 274, 114360 .

AMA Style

Miguel Marco, Eugenio Giner, María Henar Miguélez, David González. On the effect of geometrical fiber arrangement on damage initiation in CFRPs under transverse tension and compression. Composite Structures. 2021; 274 ():114360.

Chicago/Turabian Style

Miguel Marco; Eugenio Giner; María Henar Miguélez; David González. 2021. "On the effect of geometrical fiber arrangement on damage initiation in CFRPs under transverse tension and compression." Composite Structures 274, no. : 114360.

Journal article
Published: 17 June 2021 in Materials & Design
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The paper describes Electromagnetic Ring Expansion Tests (ERET) performed on Laser Melting Powder Bed Fusion (LPBF) Inconel 718 stress relieved test pieces, to establish the effect of a randomly dispersed spherically voided microstructure on tensile ductility, fracture, and fragmentation at high strain rate (10−3 < ε < 104 s−1). An empirical model to predict porosity type and growth rates as a function of laser energy density was established, to select the LPBF process parameters to fabricate test pieces under stable conduction and keyhole melting. The size, shape, distribution of macro and keyhole pores in the test pieces obtained for ERET testing were characterised. At high strain rate the number of ring fragments for the highest porosity doubled, accompanied by a reduction in true strain at maximum uniform elongation and fracture strain. The trend for reducing fracture strain with increasing porosity at high strain rate was described by a decaying power law. Overall, there was a significant positive strain rate effect on tensile ductility at lower porosities attributed strain rate hardening (Hart, 1967) [1]. Fracture surfaces containing the highest porosity identified four different void coalescence mechanisms that helped explain the influence of larger pores on the stress state in the alloy.

ACS Style

P. Wood; A. Rusinek; P. Platek; J. Janiszewski; J. Sienkiewicz; U.F. Gunputh; K. Rajkowski; M.H. Miguélez. High strain rate effect on tensile ductility and fracture of AM fabricated Inconel 718 with voided microstructures. Materials & Design 2021, 208, 109908 .

AMA Style

P. Wood, A. Rusinek, P. Platek, J. Janiszewski, J. Sienkiewicz, U.F. Gunputh, K. Rajkowski, M.H. Miguélez. High strain rate effect on tensile ductility and fracture of AM fabricated Inconel 718 with voided microstructures. Materials & Design. 2021; 208 ():109908.

Chicago/Turabian Style

P. Wood; A. Rusinek; P. Platek; J. Janiszewski; J. Sienkiewicz; U.F. Gunputh; K. Rajkowski; M.H. Miguélez. 2021. "High strain rate effect on tensile ductility and fracture of AM fabricated Inconel 718 with voided microstructures." Materials & Design 208, no. : 109908.

Journal article
Published: 15 December 2020 in Materials
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Products produced by additive manufacturing (AM) seek to exploit net shape manufacturing by eliminating or minimizing post-process stages such as machining. However, many applications which include turbo machinery components with tight dimensional tolerances and a smooth surface finish will require at least a light machine finishing stage. This paper investigates the machinability of the additively fabricated INCONEL718 (IN718) alloy produced by laser melting powder bed fusion (LM-PBF) with different levels of spherical porosity in the microstructure. The literature suggests that the band width for laser energy density, which combines the various scan process parameters to obtain a low spherical type porosity in the LM-PBF IN718 alloy (~1%), has wide breadth. With the increasing laser energy density and above a threshold, there is a rapid increase in the spherical pore size. In this paper, three tube samples each with different levels of spherical porosity were fabricated by varying the laser energy density for LM-PBF of the IN718 alloy within the stable and higher energy density range and the porosity measured. A low laser energy density was avoided due to balling up, which promotes highly irregular lack of fusion defects and poor consolidation within the alloy microstructure. An orthogonal turning test instrumented, with a three-component dynamometer to measure the cutting forces, was performed on AM produced IN718 tube samples under light cut conditions to simulate a finish machining process. The orthogonal turning tests were also performed on a tube sample obtained from the wrought extruded stock. The machining process parameters, which were studied include varying the cutting speed at three levels, at a fixed feed and under dry cut conditions for a short duration to avoid the tool wear. The results obtained were discussed and a notable finding was the higher rate of built-up-edge formation on the tool tip from the AM samples with a higher porosity and especially at a higher cutting speed. The paper also discusses the mechanisms that underpin the findings.

ACS Style

Paul Wood; Antonio Díaz-Álvarez; José. Díaz-Álvarez; María Henar Miguélez; Alexis Rusinek; Urvashi F. Gunputh; Gavin Williams; Slim Bahi; Judyta Sienkiewicz; Paweł Płatek. Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities. Materials 2020, 13, 5730 .

AMA Style

Paul Wood, Antonio Díaz-Álvarez, José. Díaz-Álvarez, María Henar Miguélez, Alexis Rusinek, Urvashi F. Gunputh, Gavin Williams, Slim Bahi, Judyta Sienkiewicz, Paweł Płatek. Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities. Materials. 2020; 13 (24):5730.

Chicago/Turabian Style

Paul Wood; Antonio Díaz-Álvarez; José. Díaz-Álvarez; María Henar Miguélez; Alexis Rusinek; Urvashi F. Gunputh; Gavin Williams; Slim Bahi; Judyta Sienkiewicz; Paweł Płatek. 2020. "Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities." Materials 13, no. 24: 5730.

Journal article
Published: 10 November 2020 in Composite Structures
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Lattice and porous structures have attracted attention in scientific literature due to the development of 3D printers that facilitate their manufacturing. A thorough understanding of the mechanical behaviour of these structures is necessary. In this work, several lattice and porous structures are analysed using the finite element method. Eleven configurations have been studied using periodic boundary conditions, in order to numerically estimate their elastic mechanical properties (Young’s modulus, shear modulus and Poisson’s ratio) as a function of the structure porosity. In addition, a tensile fracture test has been modelled to analyse the predicted fracture pattern as well as the stress-strain curve for each structure. It is shown that structures based on spherical holes distributions lead to stiffer structures in tensile and shear conditions. The distribution of cavities has a strong influence on the mechanical behaviour. The square distribution improves stiffness, while the hexagonal distribution improves the shear modulus. Random distributions clearly decrease the stiffness and strength of the structure, although the damage in these structures is more progressive. Therefore, this work provides a comparative study to assess the influence of the lattice topological structure on some mechanical properties of interest in structural engineering, as a function of porosity.

ACS Style

Miguel Marco; Ricardo Belda; María Henar Miguélez; Eugenio Giner. Numerical analysis of mechanical behaviour of lattice and porous structures. Composite Structures 2020, 261, 113292 .

AMA Style

Miguel Marco, Ricardo Belda, María Henar Miguélez, Eugenio Giner. Numerical analysis of mechanical behaviour of lattice and porous structures. Composite Structures. 2020; 261 ():113292.

Chicago/Turabian Style

Miguel Marco; Ricardo Belda; María Henar Miguélez; Eugenio Giner. 2020. "Numerical analysis of mechanical behaviour of lattice and porous structures." Composite Structures 261, no. : 113292.

Journal article
Published: 16 October 2020 in Materials
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In this paper, experimental and numerical results of an aluminum alloy’s mechanical behavior are discussed. Over a wide range of strain rates (10−4 s−1 ≤ έ ≤ 103 s−1) the influence of the loading impact, velocity and temperature on the dynamic response of the material was analyzed. The interface friction effect on the material’s dynamic response is examined using a split Hopkinson pressure bar (SHPB) in a high temperature experiment using finite element analysis (FEA). The effect of different friction conditions between the specimen and the transmitted/incident bars in the SHPB system was examined using cylinder bulk specimens and cylinder plates defined with four-layer configurations. The results of these tests alongside the presented numerical simulations allow a better understanding of the phenomenon and reduces (minimizes) errors during compression tests at high and low strain rates with temperatures ranging from 21 to 300 °C.

ACS Style

Amine Bendarma; Tomasz Jankowiak; Alexis Rusinek; Tomasz Lodygowski; Bin Jia; María Henar Miguélez; Maciej Klosak. Dynamic Behavior of Aluminum Alloy Aw 5005 Undergoing Interfacial Friction and Specimen Configuration in Split Hopkinson Pressure Bar System at High Strain Rates and Temperatures. Materials 2020, 13, 4614 .

AMA Style

Amine Bendarma, Tomasz Jankowiak, Alexis Rusinek, Tomasz Lodygowski, Bin Jia, María Henar Miguélez, Maciej Klosak. Dynamic Behavior of Aluminum Alloy Aw 5005 Undergoing Interfacial Friction and Specimen Configuration in Split Hopkinson Pressure Bar System at High Strain Rates and Temperatures. Materials. 2020; 13 (20):4614.

Chicago/Turabian Style

Amine Bendarma; Tomasz Jankowiak; Alexis Rusinek; Tomasz Lodygowski; Bin Jia; María Henar Miguélez; Maciej Klosak. 2020. "Dynamic Behavior of Aluminum Alloy Aw 5005 Undergoing Interfacial Friction and Specimen Configuration in Split Hopkinson Pressure Bar System at High Strain Rates and Temperatures." Materials 13, no. 20: 4614.

Journal article
Published: 27 September 2020 in Materials
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Dynamic impact tests using thin metal plates for ballistic characterization have received significant attention in recent years. The Johnson–Cook (J–C) model is extensively used in numerical modeling of impact and penetration in metals. The AISI (American Iron and Steel Institute) 301 steel family presents good impact behavior, excellent formability, and high corrosion resistance. Thus, NICRO (Nickel and Hard Chrome Plated Steel) 12.1 (part of the AISI 301 steel family) was chosen in this work, although parameters of the J–C model or impact results were not found in the literature. In this work, NICRO 12.1 steel plates, were characterized in ballistics with an initial impact velocity up to 200 m/s and three shape nose projectiles. The Johnson–Cook parameters for the NICRO 12.1 steel were calculated for a large range of temperatures and strain rates. Impact tests were carried out using three projectiles: conical, hemispherical, and blunt. The ballistic curves, failure mode, and maximum deformation obtained with each projectile, experimentally and numerically, were compared, and a good correlation was obtained.

ACS Style

Eva Alonso-Elías; Alexis Rusinek; Ignacio Rubio-Díaz; Richard Bernier; Marcos Rodríguez-Millán; María Henar Miguelez. Experimental and Numerical Study of the Thermo-Viscoplastic Behavior of NICRO 12.1 for Perforation Tests. Materials 2020, 13, 4311 .

AMA Style

Eva Alonso-Elías, Alexis Rusinek, Ignacio Rubio-Díaz, Richard Bernier, Marcos Rodríguez-Millán, María Henar Miguelez. Experimental and Numerical Study of the Thermo-Viscoplastic Behavior of NICRO 12.1 for Perforation Tests. Materials. 2020; 13 (19):4311.

Chicago/Turabian Style

Eva Alonso-Elías; Alexis Rusinek; Ignacio Rubio-Díaz; Richard Bernier; Marcos Rodríguez-Millán; María Henar Miguelez. 2020. "Experimental and Numerical Study of the Thermo-Viscoplastic Behavior of NICRO 12.1 for Perforation Tests." Materials 13, no. 19: 4311.

Journal article
Published: 26 July 2020 in Sensors
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In this work, the role of the contact stiffness in the measurement of principal variables in fretting wear tests is assessed. Several fretting wear tribometers found in the literature, including one developed by the authors, are analysed and modelled using numerical methods. The results show the importance of the tribosystem stiffness and tangential contact stiffness in the displacement sensor calibration and in the correct numerical modelling of fretting wear tests, especially for flat-to-flat contact configuration. The study highlights that, in most cases, direct comparisons between fretting results with severe wear obtained with different tribometers cannot be performed if the contact stiffness is not properly considered during the development of the experiments.

ACS Style

Diego Infante-García; Miguel Marco; Alaitz Zabala; Farshad Abbasi; Eugenio Giner; Iñigo Llavori. On the Role of Contact and System Stiffness in the Measurement of Principal Variables in Fretting Wear Testing. Sensors 2020, 20, 4152 .

AMA Style

Diego Infante-García, Miguel Marco, Alaitz Zabala, Farshad Abbasi, Eugenio Giner, Iñigo Llavori. On the Role of Contact and System Stiffness in the Measurement of Principal Variables in Fretting Wear Testing. Sensors. 2020; 20 (15):4152.

Chicago/Turabian Style

Diego Infante-García; Miguel Marco; Alaitz Zabala; Farshad Abbasi; Eugenio Giner; Iñigo Llavori. 2020. "On the Role of Contact and System Stiffness in the Measurement of Principal Variables in Fretting Wear Testing." Sensors 20, no. 15: 4152.

Journal article
Published: 25 July 2020 in Sensors
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Developing more efficient methods for antibiotic susceptibility testing is a pressing issue in novel drug development as bacterial resistance to antibiotics becomes increasingly common. Microfluidic devices have been demonstrated to be powerful platforms that allow researchers to perform multiplexed antibiotic testing. However, the level of multiplexing within microdevices is limited, evidencing the need of creating simple, low-cost and high-resolution imaging systems that can be integrated in antibiotic development pipelines. This paper describes the design and development of an epifluorescence inverted microscope that enables long-term monitoring of bacteria inside multiplexed microfluidic devices. The goal of this work is to provide a simple microscope powerful enough to allow single-cell analysis of bacteria at a reduced cost. This facilitates increasing the number of microscopes that are simultaneously used for antibiotic testing. We prove that the designed system is able to accurately detect fluorescent beads of 100 nm, demonstrating comparable features to high-end commercial microscopes and effectively achieving the resolution required for single-cell analysis of bacteria. The proposed microscope could thus increase the efficiency in antibiotic testing while reducing cost, size, weight, and power requirements, contributing to the successful development of new antibiotic drugs.

ACS Style

Amaro Torres-Simón; María Henar Marino; Clara Gómez-Cruz; Marina Cañadas; Miguel Marco; Jorge Ripoll; Juan José Vaquero; Arrate Muñoz-Barrutia. Development of an Inverted Epifluorescence Microscope for Long-Term Monitoring of Bacteria in Multiplexed Microfluidic Devices. Sensors 2020, 20, 4140 .

AMA Style

Amaro Torres-Simón, María Henar Marino, Clara Gómez-Cruz, Marina Cañadas, Miguel Marco, Jorge Ripoll, Juan José Vaquero, Arrate Muñoz-Barrutia. Development of an Inverted Epifluorescence Microscope for Long-Term Monitoring of Bacteria in Multiplexed Microfluidic Devices. Sensors. 2020; 20 (15):4140.

Chicago/Turabian Style

Amaro Torres-Simón; María Henar Marino; Clara Gómez-Cruz; Marina Cañadas; Miguel Marco; Jorge Ripoll; Juan José Vaquero; Arrate Muñoz-Barrutia. 2020. "Development of an Inverted Epifluorescence Microscope for Long-Term Monitoring of Bacteria in Multiplexed Microfluidic Devices." Sensors 20, no. 15: 4140.

Journal article
Published: 17 May 2020 in Sensors
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This work focuses on the combination of two complementary non-destructive techniques to analyse the final deformation and internal damage induced in aramid composite plates subjected to ballistic impact. The first analysis device, a 3D scanner, allows digitalising the surface of the tested specimen. Comparing with the initial geometry, the permanent residual deformation (PBFD) can be obtained according to the impact characteristics. This is a significant parameter in armours and shielding design. The second inspection technique is based on computed tomography (CT). It allows analysing the internal state of the impacted sample, being able to detect possible delamination and fibre failure through the specimen thickness. The proposed methodology has been validated with two projectile geometries at different impact velocities, being the reaction force history on the specimen determined with piezoelectric sensors. Different loading states and induced damages were observed according to the projectile type and impact velocity. In order to validate the use of the 3D scanner, a correlation between impact velocity and damage induced in terms of permanent back face deformation has been realised for both projectiles studied. In addition, a comparison of the results obtained through this measurement method and those obtained in similar works, has been performed in the same range of impact energy. The results showed that CT is needed to analyse the internal damage of the aramid sample; however, this is a highly expensive and time-consuming method. The use of 3D scanner and piezoelectric sensors is perfectly complementary with CT and could be relevant to develop numerical models or design armours.

ACS Style

Ignacio Rubio; Antonio Díaz-Álvarez; Richard Bernier; Alexis Rusinek; Jose Antonio Loya; Maria Henar Miguelez; Marcos Rodríguez-Millán. Postmortem Analysis Using Different Sensors and Technologies on Aramid Composites Samples after Ballistic Impact. Sensors 2020, 20, 2853 .

AMA Style

Ignacio Rubio, Antonio Díaz-Álvarez, Richard Bernier, Alexis Rusinek, Jose Antonio Loya, Maria Henar Miguelez, Marcos Rodríguez-Millán. Postmortem Analysis Using Different Sensors and Technologies on Aramid Composites Samples after Ballistic Impact. Sensors. 2020; 20 (10):2853.

Chicago/Turabian Style

Ignacio Rubio; Antonio Díaz-Álvarez; Richard Bernier; Alexis Rusinek; Jose Antonio Loya; Maria Henar Miguelez; Marcos Rodríguez-Millán. 2020. "Postmortem Analysis Using Different Sensors and Technologies on Aramid Composites Samples after Ballistic Impact." Sensors 20, no. 10: 2853.

Original paper
Published: 03 February 2020 in International Journal of Fracture
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The finite element method has been widely used to solve different problems in the field of fracture mechanics. In the last two decades, new methods have been developed to improve the accuracy of the solution in 2D linear elastic fracture mechanics problems, such as the extended finite element method (XFEM) or the phantom node method (PNM). The goal of this work is to quantify the differences between some numerical approaches: standard finite element method (FEM), mechanical property degradation, interelemental crack method with multi-point constraints, XFEM and PNM. We explain the different techniques analysed together with their advantages and disadvantages. We compare these numerical techniques to model fracture using problems of reference with known solutions, evaluating their behaviour in terms of convergence with respect to the element size and accuracy of the stress intensity factor (SIF), stresses ahead the crack tip and crack propagation prediction. Some of the new techniques have shown a better accuracy in SIF calculation or stress fields ahead the crack tip and other lead to high errors in local results estimations. However, all methods reviewed here can predict crack propagation for the problems of reference of this work, showing good accuracy in crack orientation prediction.

ACS Style

Miguel Marco; Diego Infante-Garcia; Ricardo Belda; Eugenio Giner. A comparison between some fracture modelling approaches in 2D LEFM using finite elements. International Journal of Fracture 2020, 223, 151 -171.

AMA Style

Miguel Marco, Diego Infante-Garcia, Ricardo Belda, Eugenio Giner. A comparison between some fracture modelling approaches in 2D LEFM using finite elements. International Journal of Fracture. 2020; 223 (1):151-171.

Chicago/Turabian Style

Miguel Marco; Diego Infante-Garcia; Ricardo Belda; Eugenio Giner. 2020. "A comparison between some fracture modelling approaches in 2D LEFM using finite elements." International Journal of Fracture 223, no. 1: 151-171.

Journal article
Published: 06 September 2019 in Metals
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Nickel-based superalloys exhibit an exceptional combination of corrosion resistance, enhanced mechanical properties at high temperatures, and thermal stability. The mechanical behavior of nickel-based superalloys depends on the grain size and the precipitation state after aging. Haynes 282 was developed in order to improve the creep behavior, formability, and strain-age cracking of the other commonly used nickel-based superalloys. Nevertheless, taking into account the interest of the industry in the machinability of Haynes 282 because of its great mechanical properties, which is not found in other superalloys like Inconel 718 or Waspaloy, more research on this alloy is necessary. Cutting tools suffer extreme thermomechanical loading because of the high pressure and temperature localized in the cutting zone. The consequence is material adhesion during machining and strong abrasion due to the hard carbides included in the material. The main recommendations for finishing turning in Haynes 282 include the use of carbide tools, low cutting speeds, low depth of pass, and the use of cutting fluids. However, because of the growing interest in sustainable processes and cost reduction, dry machining is considered to be one of the best techniques for material removal. During the machining of Haynes 282, at both the finishing and roughing turning, cemented carbide inserts are most commonly used and are recommended all over the industry. This paper deals with the machining of Haynes 282 by means of coated carbide tools cutting fluids (dry condition). Different cutting speeds and feeds were tested to quantify the cutting forces, quality of surface, wear progression, and end of tool life. Tool life values similar to those obtained with a lubricant under similar conditions in other studies have been obtained for the most favorable conditions in dry environments.

ACS Style

Antonio Díaz-Álvarez; José Díaz-Álvarez; José Luis Cantero; Henar Miguélez. Sustainable High-Speed Finishing Turning of Haynes 282 Using Carbide Tools in Dry Conditions. Metals 2019, 9, 989 .

AMA Style

Antonio Díaz-Álvarez, José Díaz-Álvarez, José Luis Cantero, Henar Miguélez. Sustainable High-Speed Finishing Turning of Haynes 282 Using Carbide Tools in Dry Conditions. Metals. 2019; 9 (9):989.

Chicago/Turabian Style

Antonio Díaz-Álvarez; José Díaz-Álvarez; José Luis Cantero; Henar Miguélez. 2019. "Sustainable High-Speed Finishing Turning of Haynes 282 Using Carbide Tools in Dry Conditions." Metals 9, no. 9: 989.

Journal article
Published: 02 June 2019 in Metals
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This paper analyses the impact behavior of Inconel 718 through experimental and numerical approach. Different conical projectiles were tested in order to obtain the ballistic curves and failure mechanisms. A three-dimensional (3D) numerical model corresponding to the experimental tests was developed using the Johnson–Cook constitutive model. The experimental data (residual velocities, global, and local perforation mechanisms) were successfully predicted with the numerical simulations. The influence of the projectile’s nose angle was found to be important when designing ballistic protections. The projectile with the narrowest angle, 40°, developed a ballistic limit approximately 10 m/s lower than the projectile with a 72° nose. The use of double-nose projectile for the same nose angle, 72°, led to a ballistic limit 12 m/s lower than that obtained for the single nose.

ACS Style

Marcos Rodríguez-Millán; Antonio Díaz-Álvarez; Richard Bernier; María Henar Miguélez; José Antonio Loya; Rodríguez- Millán; Loya. Experimental and Numerical Analysis of Conical Projectile Impact on Inconel 718 Plates. Metals 2019, 9, 638 .

AMA Style

Marcos Rodríguez-Millán, Antonio Díaz-Álvarez, Richard Bernier, María Henar Miguélez, José Antonio Loya, Rodríguez- Millán, Loya. Experimental and Numerical Analysis of Conical Projectile Impact on Inconel 718 Plates. Metals. 2019; 9 (6):638.

Chicago/Turabian Style

Marcos Rodríguez-Millán; Antonio Díaz-Álvarez; Richard Bernier; María Henar Miguélez; José Antonio Loya; Rodríguez- Millán; Loya. 2019. "Experimental and Numerical Analysis of Conical Projectile Impact on Inconel 718 Plates." Metals 9, no. 6: 638.

Journal article
Published: 14 March 2019 in Computer Methods and Programs in Biomedicine
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Hip fracture morphology is an important factor determining the ulterior surgical repair and treatment, because of the dependence of the treatment on fracture morphology. Although numerical modelling can be a valuable tool for fracture prediction, the simulation of femur fracture is not simple due to the complexity of bone architecture and the numerical techniques required for simulation of crack propagation. Numerical models assuming homogeneous fracture mechanical properties commonly fail in the prediction of fracture patterns. This paper focuses on the prediction of femur fracture based on the development of a finite element model able to simulate the generation of long crack paths. The finite element model developed in this work demonstrates the capability of predicting fracture patterns under stance loading configuration, allowing the distinction between the main fracture paths: intracapsular and extracapsular fractures. It is worth noting the prediction of different fracture patterns for the same loading conditions, as observed during experimental tests. The internal distribution of bone mineral density and femur geometry strongly influences the femur fracture morphology and fracture load. Experimental fracture paths have been analysed by means of micro-computed tomography allowing the comparison of predicted and experimental crack surfaces, confirming the good accuracy of the numerical model.

ACS Style

Miguel Marco; Eugenio Giner; José Ramón Caeiro-Rey; Mª Henar Miguélez; Ricardo Larraínzar-Garijo. Numerical modelling of hip fracture patterns in human femur. Computer Methods and Programs in Biomedicine 2019, 173, 67 -75.

AMA Style

Miguel Marco, Eugenio Giner, José Ramón Caeiro-Rey, Mª Henar Miguélez, Ricardo Larraínzar-Garijo. Numerical modelling of hip fracture patterns in human femur. Computer Methods and Programs in Biomedicine. 2019; 173 ():67-75.

Chicago/Turabian Style

Miguel Marco; Eugenio Giner; José Ramón Caeiro-Rey; Mª Henar Miguélez; Ricardo Larraínzar-Garijo. 2019. "Numerical modelling of hip fracture patterns in human femur." Computer Methods and Programs in Biomedicine 173, no. : 67-75.

Journal article
Published: 01 February 2019 in Materials
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Hybrid stack drilling is a very common operation used in the assembly of high-added-value components, which combines the use of composite materials and metallic alloys. This process entails the complexity of machining very dissimilar materials, simultaneously, on account of the interactions that are produced between them, during machining. This study analyzed the influence of Minimum Quantity Lubrication (MQL) on the performance of diamond-coated carbide tools when drilling Ti/carbon fiber reinforced plastics (CFRP)/Ti stacks. The main wear mechanism observed was diamond-coating detachment, followed by fragile breaks in the main cutting-edge. The tests done with the lower lubrication levels have shown an important adhesion of titanium (mainly on the secondary cutting-edge) and a higher friction between the tool and the workpiece, producing higher temperatures on the cutting region and a thermal softening effect on the workpiece. These phenomena affect the evolution of cutting power consumption with tool wear in the titanium layer. Regarding the quality of the test specimen, no significant differences were observed between the lubrication levels tested.

ACS Style

J. Fernández-Pérez; J. L. Cantero; J. Díaz-Álvarez; M. H. Miguélez. Hybrid Composite-Metal Stack Drilling with Different Minimum Quantity Lubrication Levels. Materials 2019, 12, 448 .

AMA Style

J. Fernández-Pérez, J. L. Cantero, J. Díaz-Álvarez, M. H. Miguélez. Hybrid Composite-Metal Stack Drilling with Different Minimum Quantity Lubrication Levels. Materials. 2019; 12 (3):448.

Chicago/Turabian Style

J. Fernández-Pérez; J. L. Cantero; J. Díaz-Álvarez; M. H. Miguélez. 2019. "Hybrid Composite-Metal Stack Drilling with Different Minimum Quantity Lubrication Levels." Materials 12, no. 3: 448.

Journal article
Published: 18 October 2018 in Metals
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Nickel-based superalloys are widely used in the aeronautical industry, especially in components requiring excellent corrosion resistance, enhanced thermal fatigue properties, and thermal stability. Haynes 282 is a nickel-based superalloy that was developed to improve the low weldability, formability, and creep strength of other γ’-strengthened Ni superalloys. Despite the industrial interest in Haynes 282, there is a lack of research that is focused on this alloy. Moreover, it is difficult to find studies dealing with the machinability of Haynes 282. Although Haynes 282 is considered an alloy with improved formability when compared with other nickel alloys, its machining performance should be analyzed. High pressure and temperature localized in the cutting zone, the abrasion generated by the hard carbides included in the material, and the tendency toward adhesion during machining are phenomena that generate extreme thermomechanical loading on the tool during the cutting process. Excessive wear results in reduced tool life, leading to frequent tool change, low productivity, and a high consumption of energy; consequentially, there are increased costs. With regard to tool materials, cemented carbide tools are widely used in different applications, and carbide is a recommended cutting material for turning Haynes 282, for both finishing and roughing operations. This work focuses on the finishing turning of Haynes 282 using coated carbide tools with conventional coolant. Machining forces, surface roughness, tool wear, and tool life were quantified for different cutting speeds and feeds.

ACS Style

José Díaz-Álvarez; Antonio Díaz-Álvarez; Henar Miguélez; José Luis Cantero. Finishing Turning of Ni Superalloy Haynes 282. Metals 2018, 8, 843 .

AMA Style

José Díaz-Álvarez, Antonio Díaz-Álvarez, Henar Miguélez, José Luis Cantero. Finishing Turning of Ni Superalloy Haynes 282. Metals. 2018; 8 (10):843.

Chicago/Turabian Style

José Díaz-Álvarez; Antonio Díaz-Álvarez; Henar Miguélez; José Luis Cantero. 2018. "Finishing Turning of Ni Superalloy Haynes 282." Metals 8, no. 10: 843.

Journal article
Published: 26 July 2018 in Metals
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Inconel 718 is a Ni superalloy widely used in high responsibility components requiring excellent mechanical properties at high temperature and elevated corrosion resistance. Inconel 718 is a difficult to cut material due to the elevated temperature generated during cutting, its low thermal conductivity, and the strong abrasive tool wear during cutting process. Finishing operations should ensure surface integrity of the component commonly requiring the use of hard metal tools with sharp tool edges and moderate cutting speeds. Polycrystalline cubic boron nitride (PCBN) tools recently developed an enhanced toughness suitable for these final operations. This paper focuses on the study of PCBN tools performance in finishing turning of Inconel 718. Several inserts representative of different manufacturers were tested and compared to a reference carbide tool. The evolution of tool wear, surface roughness, and cutting forces was analyzed and discussed. PCBN tools demonstrated their suitability for finishing operations, presenting reasonable removal rates and surface quality.

ACS Style

José Díaz-Álvarez; Víctor Criado; Henar Miguélez; José Luis Cantero. PCBN Performance in High Speed Finishing Turning of Inconel 718. Metals 2018, 8, 582 .

AMA Style

José Díaz-Álvarez, Víctor Criado, Henar Miguélez, José Luis Cantero. PCBN Performance in High Speed Finishing Turning of Inconel 718. Metals. 2018; 8 (8):582.

Chicago/Turabian Style

José Díaz-Álvarez; Víctor Criado; Henar Miguélez; José Luis Cantero. 2018. "PCBN Performance in High Speed Finishing Turning of Inconel 718." Metals 8, no. 8: 582.

Journal article
Published: 01 July 2018 in Finite Elements in Analysis and Design
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ACS Style

Miguel Marco; Ricardo Belda; María Henar Miguélez; Eugenio Giner. A heterogeneous orientation criterion for crack modelling in cortical bone using a phantom-node approach. Finite Elements in Analysis and Design 2018, 146, 107 -117.

AMA Style

Miguel Marco, Ricardo Belda, María Henar Miguélez, Eugenio Giner. A heterogeneous orientation criterion for crack modelling in cortical bone using a phantom-node approach. Finite Elements in Analysis and Design. 2018; 146 ():107-117.

Chicago/Turabian Style

Miguel Marco; Ricardo Belda; María Henar Miguélez; Eugenio Giner. 2018. "A heterogeneous orientation criterion for crack modelling in cortical bone using a phantom-node approach." Finite Elements in Analysis and Design 146, no. : 107-117.

Journal article
Published: 01 June 2018 in Engineering Fracture Mechanics
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Miguel Marco; Eugenio Giner; Ricardo Larraínzar-Garijo; José Ramón Caeiro; María Henar Miguélez. Modelling of femur fracture using finite element procedures. Engineering Fracture Mechanics 2018, 196, 157 -167.

AMA Style

Miguel Marco, Eugenio Giner, Ricardo Larraínzar-Garijo, José Ramón Caeiro, María Henar Miguélez. Modelling of femur fracture using finite element procedures. Engineering Fracture Mechanics. 2018; 196 ():157-167.

Chicago/Turabian Style

Miguel Marco; Eugenio Giner; Ricardo Larraínzar-Garijo; José Ramón Caeiro; María Henar Miguélez. 2018. "Modelling of femur fracture using finite element procedures." Engineering Fracture Mechanics 196, no. : 157-167.

Journal article
Published: 01 February 2018 in Medical Engineering & Physics
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The biomechanics of the spine is experimentally assessed in terms of range of motion and overall stiffness. Quantification of the surface strain distribution is currently limited either to the vertebrae or the discs, whereas a full-field approach to measure the strain distribution in a multi-vertebra segment is currently missing. The aim of this work was to explore the feasibility of using Digital Image Correlation (DIC) to measure the strain distribution simultaneously on the vertebral bodies and the intervertebral discs of spine segments in different loading configurations. Three porcine spine segments were tested. A white-on-black speckle pattern was prepared which covered the hard and soft tissues. Two different loading configurations (flexion and lateral bending) were reproduced, while two sides of the spine were analyzed with DIC. Measurements were successfully performed on the entire region of interest of all specimens, in both configurations. The DIC analysis highlighted the strain gradients present on the spine segments including tension and compression associated with bending, the direction of principal strains in the different regions, as well as bulging of the discs under compression. Strains of tens of thousands microstrain were measured in the discs, and below 2000 microstrain in the bone. This work showed the feasibility of applying DIC on spine segments including hard and soft tissues. It also highlights the need for a full-field investigation, because of the strain inhomogeneity in the vertebrae and discs.

ACS Style

Marco Palanca; Miguel Marco; Maria Luisa Ruspi; Luca Cristofolini. Full-field strain distribution in multi-vertebra spine segments: An in vitro application of digital image correlation. Medical Engineering & Physics 2018, 52, 76 -83.

AMA Style

Marco Palanca, Miguel Marco, Maria Luisa Ruspi, Luca Cristofolini. Full-field strain distribution in multi-vertebra spine segments: An in vitro application of digital image correlation. Medical Engineering & Physics. 2018; 52 ():76-83.

Chicago/Turabian Style

Marco Palanca; Miguel Marco; Maria Luisa Ruspi; Luca Cristofolini. 2018. "Full-field strain distribution in multi-vertebra spine segments: An in vitro application of digital image correlation." Medical Engineering & Physics 52, no. : 76-83.

Journal article
Published: 13 December 2017 in Metals
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Ni-based superalloys are extensively used in high-responsibility applications in components of aerospace engines and gas turbines with high temperature service lives. The wrought, γ’-strengthened superalloy Haynes 282 has been recently developed for applications similar to other common superalloys, such as Waspaloy or Inconel 718, with improved creep behavior, thermal stability, and fabrication ability. Despite the potential of Haynes 282, there are still important gaps in the knowledge of the mechanical behavior of this alloy. In fact, it was not possible to find information concerning the mechanical behavior of the alloy under impulsive loading. This paper focuses on the mechanical characterization of the Haynes 282 at strain rates ranging from 0.1 to 2800 s−1 and high temperatures ranging from 293 to 523 K using Hopkinson bar compression tests. The experimental results from the thermo-mechanical characterization allowed for calibration of the Johnson–Cook model widely used in modeling metallic alloy’s responses under dynamic loading. Moreover, the behavior of Haynes 282 was compared to that reported for Inconel 718, and the results were used to successfully model the orthogonal cutting of Haynes 282, being a typical case of dynamic loading requiring previous characterization of the alloy.

ACS Style

Marcos Rodríguez-Millán; José Díaz-Álvarez; Richard Bernier; José Luis Cantero; Alexis Rusinek; María Henar Miguelez. Thermo-Viscoplastic Behavior of Ni-Based Superalloy Haynes 282 and Its Application to Machining Simulation. Metals 2017, 7, 561 .

AMA Style

Marcos Rodríguez-Millán, José Díaz-Álvarez, Richard Bernier, José Luis Cantero, Alexis Rusinek, María Henar Miguelez. Thermo-Viscoplastic Behavior of Ni-Based Superalloy Haynes 282 and Its Application to Machining Simulation. Metals. 2017; 7 (12):561.

Chicago/Turabian Style

Marcos Rodríguez-Millán; José Díaz-Álvarez; Richard Bernier; José Luis Cantero; Alexis Rusinek; María Henar Miguelez. 2017. "Thermo-Viscoplastic Behavior of Ni-Based Superalloy Haynes 282 and Its Application to Machining Simulation." Metals 7, no. 12: 561.