Metallurgical Abstracts on Light Metals and Alloys vol.57
The Compression Angle Dependence of the Strength of Porous Metals with Regularly Aligned Directional Pores
Daiki Ichikawa1, Mahiro Sawada1,3 and Shinsuke Suzuki1,2,3
1 Department of Applied Mechanics and Aerospace Engineering, Waseda University, Tokyo 169-8555, Japan
2 Department of Materials Science, Waseda University, Tokyo 169-8555, Japan
3 Kagami Memorial Institute for Materials Science and Technology, Waseda University, Tokyo 169-0051, Japan
[Published in Materials Transactions, Vol. 64 Issue 10 (2023)]
https://doi.org/10.2320/matertrans.MT-M2023055
E-mail: suzuki-s[at]waseda.jp
Key Words: Unidirectional porous metals, yield strength, compressive deformation behavior, failure criteria, finite element method
The paper investigates the validity of the Tsai-Hill criterion for a porous aluminum alloy with regularly aligned unidirectional pores. The Tsai-Hill criterion predicts failure in different directions in anisotropic composite material. The compression tests of porous aluminum alloy were performed with five different compression angles 0, 30, 45, 60, and 90 deg. The numerical analysis of a torsion test of the porous aluminum alloy was also performed to obtain shear strength. The yield strength of the specimen with 30, 45, and 60 deg in compression angle was successfully predicted with a maximum relative error of 4 pct by substituting the yield strength and shear strength of the specimen with 0 and 90 deg into the criterion. The applicable strain range of the Tsai-Hill criterion was also investigated by altering the yield strength to various offset strengths. The resulting prediction showed a maximum relative error of 10 pct when the offset strain was 40 pct or less. Densification of the porous structure caused a drastic decrease in prediction accuracy above that offset strain. An increase in compression angle caused a larger prediction, and buckling of the cell walls caused a smaller prediction compared to the experimental strength.