基于多轴应力损伤的薄板花瓣型破口形成机理研究  

Mechanism research of thin plate petaling under local loading based on multiaxial stress damage

作　　者：李营[1,2] 吴卫国[1] 张磊[2] 杜志鹏[2] 张玮[2] 赵鹏铎[2] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063 [2]海军装备研究院,北京100161

出　　处：《爆炸与冲击》2017年第3期554-559,共6页Explosion and Shock Waves

基　　金：国家自然科学基金项目(51509196);中央高校专项基金项目(2014-yb-20);非线性力学国家重点实验室开放基金项目(LNM201505)

摘　　要：开展了多种应力状态下的船用钢力学特性实验,基于多轴应力状态损伤的失效准则研究了局部冲击荷载作用下圆形板的花瓣型破口形成过程,划分了花瓣型破口形成的3个阶段,分析了裂纹区域、非裂纹区域应力状态变化过程及损伤情况。得到:(1)考虑多轴应力损伤的舰船用钢失效准则能有效预测受力状态复杂的花瓣状破口;(2)花瓣型破口的形成主要分为蝶形凹陷、中心区域裂纹扩展、花瓣形成与翻转等3个阶段;(3)花瓣型破口的裂纹区和非裂纹区均受力复杂,破口预测须考虑应力状态对损伤特性的影响;(4)花瓣形成过程中,第1阶段和第3阶段均匀变形,第2阶段损伤局部化明显,花瓣卷曲会造成花瓣根部的二次损伤。A failure criterion considering multiaxial stress state was proposed based on the thin plate damage testing. According to the evaluation of the stress state variation and damage level of the cracking and non-cracking areas, the following conclusions can be reached： （1） the petaling phenome- non of the thin plate used for naval ships can be forecasted effectively by the proposed failure criteri- on; （2） the petaling procedure can be divided into three distinct stages consisting of butterfly depress- ing, central area cracking, and petal processing; （3） the stress states of the cracking area and the noncracking area are complicated, and the stress state＇s influence on the damage characteristics should be considered in predicting the petaling crevasse; （4） during the petaling, the central area will sink homogeneously, the cracking will result in large local deformation, and the petal cusps＇ curve will lead to a secondary damage to the petal roots.

关 键 词：花瓣型破口 应力三轴度 应力状态 失效准则 

分 类 号：O346.5[理学—固体力学] U668.2[理学—力学]