屈服应力定义对纯铝L2屈服规律的影响

EFFECT OF DEFINITION OF THE YIELD STRESS ON YIELD RULE OF PURE ALUMINIUM L2

本文报导了工业纯铝L2薄壁圆管试件在比例加载时P-p复杂应力状态的实验研究结果,主要研究了: (1)初始加载和预施塑性变形后加载时材料硬化特性的差异;(2)不同屈服应力定义对初始屈服曲面的后继屈服曲面的影响; (3)不同屈服应力定义对强化规律的影响; (4)对相同加载路径、预变形不同的后继屈服曲面做了比较,此外,还对后继屆服曲面的角点问题进行了初步讨论。

In this paper thin-vailed tubes of pure aluminium L2 are investigated experimentally under the type of P-p in proportional loading. The main points are as follows.1.The difference of hardening characters between preloading and non-preloading .2.The effect of the definition of yield stress on the initial and subse- quent yield surfaces.3.The effect of the definition of yield stress on hardening rules.4.The comparison between the subsequent yield surfaces in different amounts of prestrains at the same loading path.