WE43合金在不同应力状态下的本构关系及断裂行为表征

Constitutive relationship and characterization of fracture behavior for WE43 alloy under various stress states

研究WE43合金在不同应力状态下的塑性和断裂行为。设计拉伸、压缩及剪切试样,并进行力学实验。采用数字图像相关技术对测试过程进行记录和处理。实验结果表明:WE43合金具有低的拉压非对称性,其断裂机制属于韧性断裂。基于Drucker屈服函数,采用不同的硬化规律模拟单轴拉伸和压缩下的塑性变形行为。通过数值模拟得到应力状态和断裂应变。采用Brozzo、Oh、Ko-Huh和DF2016准则对韧性断裂行为进行数值预测,并与实验结果进行对比。结果表明:采用Swift-Voce硬化定律和Drucker屈服函数能合理模拟塑性变形。DF2016断裂准则能准确预测合金在各种应力状态下的断裂行为。

The plasticity and fracture behavior of the WE43 alloy were investigated under various stress states.Mechanical experiments were conducted with special designed specimens for tension,compression and shear.The testing process was recorded and handled by digital image correlation technology.Experimental results show that WE43 alloy possesses the low tension-compression asymmetry and the fracture mechanism belongs to the ductile fracture.The plastic deformation behavior under uniaxial tension and compression was simulated with different hardening laws based on the Drucker yield function.The stress state and fracture strain were obtained by the numerical simulation.The ductile fracture behavior was numerically predicted by Brozzo,Oh,Ko-Huh and DF2016 criteria to compare with the experimental results.The results suggest that the plastic deformation can be reasonably modeled by the Swift-Voce hardening law and Drucker yield function.It is also demonstrated that the DF2016 criterion can accurately predict the fracture behavior of the alloy under various stress states.