复杂应力状态下7085铝合金失效破坏试验与数值研究  

Experimental and Numerical analysis of Ductile Failure of AL7085 underComplex Stress States

作　　者：刘彦杰 高小青 李明强 LIU Yan-jie;GAO Xiao-qin;LI Ming-qiang(AVIC the First Aircraft Institute,Xi’an 710089,China)

机构地区：[1]航空工业第一飞机设计研究院,西安710089

出　　处：《强度与环境》2021年第1期40-46,共7页Structure & Environment Engineering

基　　金：中国飞机强度研究所创新基金(BYST⁃CKKJ⁃20⁃027)。

摘　　要：本文在损伤力学和金属延性断裂理论的框架下,通过设计多种局部细节特征的元件级试验件,研究7085铝合金材料在不同应力状态下的破坏性能。通过试验与有限元分析相结合,建立7085铝合金材料断裂塑性应变与应力状态参数(应力三轴度)间的关系,作为金属材料失效判据。最后,通过接头结构破坏试验,验证失效判据的预测精度,试验与数值仿真结果表明通过本文设计的元件级试验件获取的材料应力三轴度-断裂应变失效判据能有效预测复杂应状态下接头结构的失效行为。In this paper,the ductile failure of AL7085 under complex stress state is researched by coupon experiment and numerical analysis in the frame of damage mechanics and ductile fracture theory.By the combination of experiment and FEM simulation,the relation of triaxiality-fracture strain is built as fracture criterion.In order to verify the accuracy of fracture criterion of AL7085,experiment of joint structure is conducted as well as the fracture simulation.The comparison of experiment and simulation shows that the fracture criterion established by coupons under complex stress state can describe the failure of joint structure in a good accuracy.

关 键 词：复杂应力状态 接头结构 延性断裂 断裂应变失效准则 有限元分析 

分 类 号：V216.5[航空宇航科学与技术—航空宇航推进理论与工程]