Experimental Study of Size Effect in Quasi-Simple Shear Plastic Deformation of Pure Aluminium Single Crystal
Experimental Study of Size Effect in Quasi-Simple Shear Plastic Deformation of Pure Aluminium Single Crystal
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纯铝单晶准简单剪切塑性变形尺寸效应的实验研究
DOI：
10.1299/kikaia.71.51
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
H. Morimoto
中科院分区：
文献类型：
--
作者：
E. Nakamachi;M. Hirose;Yoichi Kawamori;M. Nakanishi;H. Morimoto
通过实验观察，认识到晶体塑性变形过程中屈服应力和硬化演化的尺寸效应。采用不同尺寸的方形平面试件进行了准单剪试验，研究了初始屈服应力和硬化演化规律。因此，获得了以下结果。作为第一个实验结果，分解的剪切应力取决于初始平均自由通过长度的位错。第二，位错到达并穿过试样表面的过程，降低了硬化演化。作为第三种，证实了试样越小，由于位错的积累，硬化演化越高。在晶塑性本构方程中引入初始平均自由通过长度和几何必要位错对硬化演化的影响。
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.