T2纯铜平板剪切试样的大变形破坏试验研究

Experimental study on large strain failure of T2-copper plate shear specimens

用纯铜平板剪切试样进行破坏试验,对试样的断口倾角、韧带截面和断裂截面的应力三轴度、Lode参数进行了计算分析,并通过实测给出破坏区域的断裂应变估计,从而给出平板剪切试样剪切断裂应变与光滑试样拉伸断裂应变的比较,两者近似相等。该结果证实Rice-Tracey指数函数公式与实测断裂应变规律不符,从而说明Rice-Tracey指数函数公式在应用过程中存在局限性。

The rupture experiments were conducted by using plate shear specimen of T2 pure cop-per. The fracture dip angle, the stress triaxiality and Lode parameters at the ligament section and the fracture section of the specimen were analyzed and calculated, and the fracture strain of failure area was estimated, which gave the comparison of shear fracture strain with tensile fracture strain of the material. Both the two strains are approximately equal. The results imply that Rice-Tracey exponen-tial function formula does not match the fracture strain data by the experiment, which also shows the limitations of Rice-Tracey exponential function formula in its application.