予変形が種々の方向に重畳されるときのその後の塑性変形挙動 : 第3報, 繰返し予変形後の再負荷変形特性

概要

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The plastic behavior of metals (SUS 304, 2-1/4Cr-1 Mo steel Al alloy) after cyclic prestraining is systematically and experimentally investigated in a stress (strain) plane that consists of axial and torsional stress (strain) components. A useful multiaxial deformations sensor for both a cyclic test and a following large straining test is developed. The stress level in reloading after cyclic prestraining is never below the initial stress-strain curve, independently of the loading direction, even after cyclic softening, but may become strong depending on the prestraining direction, even after cyclic softening has occurred. An initial plastic anisotropy is never weak and never vanishes due to cyclic prestraining, but may become strong depending on the prestraining direction. The larger the cyclic strain hardening, the smaller the coefficient of work hardening in reloading. Therefore, it is suggested that the initial stress-strain relations should/can be used as basic material data for a strength and safty analysis of a structure that is subjected to both an usual cyclic load and an abrupt overload due to accident, earthquake and so on.
一般社団法人日本機械学会の論文
1986-08-25