2437 繰返し二軸圧縮に伴うアルミニウムの塑性挙動(G03-9 変形・弾塑性挙動(2),G03 材料力学)

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  • 2437 Plastic Behavior of Aluminum during Cyclic Biaxial Compression

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The plastic behavior of metallic material is known to be influenced by strain paths. In order to improve the metal working products after severe deformation processes, it is necessary to clarify the resulting mechanical properties and establish the estimation procedure after various large plastic deformation. As one of the approaches for that purpose, the cyclic biaxial compression tests were performed on industrial aluminum to investigate the influence of compressive strain histories upon mechanical behavior. The biaxial compression with arbitrary strain path was achieved by a newly developed biaxial compression test device. We selected the five different cyclic strain paths, by which the material ideally returns to its original shape after deformation. The influences of strain paths were clearly observed on the stress-strain relations. Although the equivalent stress at the end of each deformation cycle was found to increase despite the strain paths, the largest increment of the stress for the cumulative strain was obtained by the sequential plane strain compressions.

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