Development of the multi-axial stress test machine and verification of crystal plasticity model

研制了一种薄壁管状试件多轴向应力试验机。试验机能够对薄壁管状试样施加轴向力、内部压力和扭矩。利用研制的试验装置，可以观察到三轴应力状态下的塑性变形行为。这台机器观察到的实验证据将为验证金属的本构模型提供有意义的信息。

A multi-axial stress testing machine for thin-walled tubular specimens has been developed in the present study. The test machine is capable of applying axial force, internal pressure and torque to a thin-walled tubular specimen. Using the testing apparatus developed in this study, the plastic deformation behavior under tri-axial stress state can be observed. This experimental evidence observed by this machine would provide meaningful information for validating the constitutive models for metals.