Compressive Behavior of Porous Metals with Aligned Unidirectional Pores Compressed in the Direction Perpendicular to the Pore Direction

Tamai, Tomoya; Muto, Daiki; Yoshida, Teruo; Sawada, Masaru; Suzuki, Shinsuke; Vesenjak, Matej; Ren, Zoran

doi:10.1007/s11661-019-05183-3

Cited by 6 publications

(6 citation statements)

References 25 publications

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“…Tamai et al revealed that pores deform sequentially row by row from central row to upper and lower rows in aligned unidirectional porous metal. 17) However, the specimens in this research do not deform as that of an aligned one. First, deformation occurs at the cell wall, which has relatively small • pc A, then it spreads to its surrounding.…”

Section: Evaluation Of Each Cell Wallmentioning

confidence: 72%

“…However, we found that the solver was able to converge only up to approximately 15% in compressive strain due to extremely large local deformation. 17) Therefore, an explicit solver was employed for this study to account also for large deformation, since the focus of this study is the deformation behavior in the plateau region, which exceeds 15% in compressive strain. Using the settings above, we proceeded with the FEA of the other specimen R0.2581 and newly added five different pore geometries.…”

Section: Methodsmentioning

confidence: 99%

“…Tamai et al calculated critical stress for the plastic collapse of the cell walls • pc by considering their bending moment, shear force, and axial force. 17) This approach evaluates the geometric and material strength of the cell walls before compression. Therefore, it can be also applied to evaluate various shapes of the cell walls in this study.…”

Section: Evaluation Of Each Cell Wallmentioning

confidence: 99%

“…Tamai et al then fabricated a porous specimen with aligned unidirectional pores in order to simplify the deformation behavior and be able to do an in situ observation of the pores. 17) They revealed that the plateau region is initiated due to the plastic collapse of the cell walls by constructing a new model of cell walls, which is based on the deformation model of Gibson and Ashby. 18) They also observed a sudden drop in compressive stress in the plateau region with some relative thicknesses.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Compressive Stress Drop in the Plateau Region in Porous Metals with Unidirectional Pores

et al. 2020

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A drop in compressive stress in the plateau region is one of the issues in compressive behavior of porous metals since it has a negative effect on energy absorption efficiency. The compressive deformation behavior of porous aluminum with irregular unidirectional pores was investigated to clarify the mechanism of the drop. Compression tests of cubic specimens with various irregular circular pore geometries were performed. Digital image correlation and finite element analysis were also conducted to obtain strain and stress distribution of the surface perpendicular to the pores. Fracture of the cell walls was observed when the drop occurred. The results show that pore geometry has an effect on the number and the amount of drop in compressive stress. Measurement of an area of two nearest pores of the fractured cell walls suggests that the amount of drop in compressive stress increases as the area increases. Also, a calculation of normalized critical stress for the plastic collapse of the cell walls shows that the fractured cell walls tend to be geometrically weak. Furthermore, stress concentration occurred around the fractured cell walls, which resulted in a secondary fracture of the cell walls.

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Section: Evaluation Of Each Cell Wallmentioning

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Evaluation Of Each Cell Wallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the Compressive Stress Drop in the Plateau Region in Porous Metals with Unidirectional Pores

et al. 2020

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“…The mechanical properties of that porous metals have been investigated. [11] However, the question arose: What is an optimal pore layout for energy absorption?…”

Section: Introductionmentioning

confidence: 99%

Prediction of Macroscopic Deformation Bands in Porous Metals with Unidirectional Through‐Pores

Sawada,

Suzuki

2023

Adv Eng Mater

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The formation of macroscopic deformation bands constitutes undesired stress fluctuations in the compression of porous metals. This research aimed to reveal the predictability of the formation of deformation bands in porous metals with unidirectional through‐pores. Finite element analyses of compression tests of such porous metals were conducted with the commercial code Abaqus/Standard and Explicit 2018. Three cubic specimens with different L/d (specimen edge length L, pore diameter d) but with the almost same porosity were prepared, and quasi‐static compression was simulated. The results suggested that the formation of horizontally propagated deformation bands will be suppressed as L/d increases. A path search was performed to predict the location of deformation bands on a graph that represents equivalent plastic strain (PEEQ) distribution in the specimens. It was revealed that horizontally propagated deformation bands at compressive strain e=10.0 pct can be predicted as the path with the largest mean of PEEQ at e=1.0 pct when the following two conditions are met; the minimum PEEQ in the path has to be larger than zero, and the standard deviation of the PEEQ mean in candidate paths has to be sufficiently large.This article is protected by copyright. All rights reserved.

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Nonlinear analysis of compressive behavior of 17-4PH steel structures with large spherical pores built by selective laser melting

et al. 2022

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Compressive Behavior of Porous Metals with Aligned Unidirectional Pores Compressed in the Direction Perpendicular to the Pore Direction

Cited by 6 publications

References 25 publications

Characterization of the Compressive Stress Drop in the Plateau Region in Porous Metals with Unidirectional Pores

Characterization of the Compressive Stress Drop in the Plateau Region in Porous Metals with Unidirectional Pores

Prediction of Macroscopic Deformation Bands in Porous Metals with Unidirectional Through‐Pores

Nonlinear analysis of compressive behavior of 17-4PH steel structures with large spherical pores built by selective laser melting

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