High Strain Rate and Plastic Deformation Response of OFHC Copper by Finite Element Method

Etemadi, Ehsan; Zamani, Jamal; Mousavi, M

doi:10.1155/2014/620854

Cited by 6 publications

(5 citation statements)

References 19 publications

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“…All four structures studied in this research were designed in the CAD section of SolidWorks 2018 software and then imported into the Abaqus/CAE 2017 software. Abaqus is a powerful software to simulate structures under static [83] and dynamic loading [84,85]. The defined interaction properties for the contact between the components were considered as 'All With Self' with tangential behavior and friction coefficient of 0.2, and the Tie constraint was used at the junctions of the components of the structure.…”

Section: Finite Element Simulationmentioning

confidence: 99%

Design of novel 3D auxetic structures based on S-shaped unit-cells

Khadem-Reza¹,

Etemadi²,

Abbaslou³

et al. 2022

Smart Mater. Struct.

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In this study, four novel three-dimensional (3D) warp and woof structures with negative Poisson’s ratio (NPR) were designed and assembled using the interlocking assembly method. The designed structures, including S-shaped auxetic unit-cells (UCs), exhibited NPR properties in two perpendicular planes. Because of the lower stress concentration of S-shaped than conventional re-entrant UCs, this UC was suggested for use in energy absorber structures. Furthermore, the mechanical behavior of the designed structures under quasi-static loading was simulated using the finite element method (FEM). In addition, two designed structures were fabricated using fused deposition modeling (FDM) 3D printing technology and subjected to quasi-static compressive loading. The results of FE simulation and experimental work were verified and good agreement was found between them. Stress-strain diagrams, values of energy absorption (W), specific energy absorption (Ws), and NPRs in two perpendicular planes were evaluated. The results showed that four designed auxetic structures had NPR in two perpendicular directions. In addition, stress concentration contours of the structures were investigated using FE simulation. Finally, considering the results of energy absorption and stress concentration for designed structures, the proposed structure to be utilized for energy-absorbing systems was introduced.

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Section: Finite Element Simulationmentioning

confidence: 99%

Design of novel 3D auxetic structures based on S-shaped unit-cells

Khadem-Reza¹,

Etemadi²,

Abbaslou³

et al. 2022

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

“…ABAQUS software has the ability to solve static and dynamic problems with complex geometries of several types of structures and composites through different nonlinear analysis. [27][28][29][30][31][32] Figure 1(a) shows the overall scheme and the chosen Cartesian coordinate system for the RVE. Figure 1(b) shows the location of the spheres and the fiber in RVE for a specific case.…”

Section: Homogenization By Micromechanicsmentioning

confidence: 99%

Evaluation of mechanical properties of fiber reinforced composites filled with hollow spheres: A micromechanics approach

Biarjemandi

Etemadi

Lezgy-Nazargah

2020

Journal of Composite Materials

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Recent researches show that the embedment of hollow spheres in the matrix phase of composite materials improves the strength of these structures against crack propagations. Rare studies are reported for calculating equivalent elastic constants of fiber reinforced composites containing hollow spheres. In this paper, the effects of hollow spheres on mechanical characteristics of fiber reinforced composite are studied for the first time. To achieve this aim, a micromechanics based finite element method is employed. Representative volume elements (RVEs) including hollow spheres with different radius, thickness and volume fraction of hollow spheres, are modeled by using 3D finite elements. The equivalent elastic constants are calculated through homogenization technique. The results are compared with available experimental works. Good agreements find between two sets of results. Also, the volume fraction, number and thickness of hollow spheres as effective parameters on mechanical properties of composite were investigated. The results show the equivalent elastic properties increase with increasing the volume fraction and number of hollow spheres and decrease with increasing the number of hollow spheres. Furthermore, the equivalent Young’s modulus in transverse directions to the fiber direction and shear modulus of the composite increase with increasing the thickness of hollow spheres. As a final result, the presence of hollow spheres in the matrix phase generally increases the equivalent elastic constants without significant changes in the weight of structures.

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“…ABAQUS is a powerful software for modeling different constitutive equations for various structures under several strain rate loadings. [18][19][20] Owing to the symmetric geometry of the model, including the punch, die, and sample, only half of the model was simulated, reducing the computational costs. Figure 3(a) to (d) shows the finite element simulations pertaining to the three setups (U1, U2, and U3) and the regular U-bending setup (U4).…”

Section: Finite Element Simulationmentioning

confidence: 99%

Novel U-bending designed setups for investigating the spring-back/spring-go of two-layer aluminum/copper sheets through experimental tests and finite element simulations

Etemadi

Naseri

Valinezhad

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper presents novel U-bending setups in order to investigate the effects of the curvatures created on the punch, die, or both on the spring-back/spring-go of the two-layer aluminum/copper sheets. Comparison of the new U-bending setups with the regular ones showed that the curvatures had important roles in reducing the spring-back/spring-go in the U-bending process. The results further indicated the good agreement between spring-back/spring-go and finite element simulations. Moreover, through finite element simulations, the effects of three effective parameters on reducing the spring-back/spring-go, including the curvature radius ( r) of the punch, the distance between curvature center and the fillet center ( d) in the punch, and the curvature radius at the end of the die ( R) were investigated. In achieving the desired state (90°), the results showed that the distance of curvature center from the fillet center ( d) was a more important parameter compared with the curvature radius at the end of the punch ( r) and the curvature radius at the end of the die ( R). This paper also focuses on the thicknesses of copper and aluminum as well as the stacking sequence of layers. Concerning the thicknesses of the implemented copper and aluminum change, the minimum angle of the spring-back/spring-go relative to the desired state was 75% Al/25% Cu thickness. Furthermore, the spring-back of aluminum/copper was lower than the copper/aluminum layer sheet. The effects of both thickness changing and stacking sequence of aluminum/copper layers on the spring-back/spring-go amounts of different sheets were due to the relocation of the neutral axis.

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High Strain Rate and Plastic Deformation Response of OFHC Copper by Finite Element Method

Cited by 6 publications

References 19 publications

Design of novel 3D auxetic structures based on S-shaped unit-cells

Design of novel 3D auxetic structures based on S-shaped unit-cells

Evaluation of mechanical properties of fiber reinforced composites filled with hollow spheres: A micromechanics approach

Novel U-bending designed setups for investigating the spring-back/spring-go of two-layer aluminum/copper sheets through experimental tests and finite element simulations

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