純アルミニウム単結晶の準単純せん断塑性変形実験による寸法効果の検討

概要

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The size effects on yield stress and hardening evolution in the crystal plastic deformation processes has been recognized through experimental observations. The quasi-simple shear experiments to evaluate the initial yield stress and the hardening evolution by employing different sizes of square plane specimen was executed. Consequently, the following results were obtained. As a first experimental result, the resolved shear stress depends on the initial mean free pass length of dislocations. As a second one, the process, in which dislocations reach and pass through the surface of a specimen, decreases the hardening evolution. As a third one, it was confirmed that the smaller the specimen, the higher hardening evolution because of accumulation of dislocation. Further, it was concluded that initial mean free pass length and geometrically necessary dislocation effect on hardening evolution should be introduced in the crystalline plastic constitutive equation.
一般社団法人日本機械学会の論文
2005-01-25