韧性材料在多向动应力状态下的动强度理论  

The Dynamic Failure Criterion of the Toughness Material at Multiaxis Dynamic Stresses State

作　　者：张正元[1] 周中坚[1] 惠君 

机构地区：[1]同济大学机械学院

出　　处：《同济大学学报（自然科学版）》1989年第4期475-482,共8页Journal of Tongji University:Natural Science

摘　　要：韧性材料的多向静应力状态,有最大正应力、最大剪应力等强度理论,作为强度设计计算的判断准则,而在多向动应力状态下的强度理论是什么呢?至今尚未有确切的定论。本文根据韧性材料的疲劳破坏机理,提出了在多向动应力状态下,材料的某一截面上沿某个方向首先开始破坏,主要是由于其剪应力时间历程的作用最不利所引起的,并同时考虑了该截面上的正应力时间历程的影响,建立了韧性材料在多向动应力状态下疲劳破坏截面的位置及其寿命的计算公式,作为动强度设计计算的判断准则,简称之为动强度理论。For a static stresses state of toughness material, there are 4 failure criterions such as maximum normal stress criterion and maximum shear stress criterion used as judge criterion of strength design and calculation. But what is the failure criterion for multiaxis dynamic stresses state? There has been no conclusion before. According to the mechanism of fatigue fracture, this paper advances a new theory that at a multiaxis dynamic stresses state a section of the material first destroys in the direction of shear stress time history effect＇s being most unfavourable. And considering the effect of the normal stress time history, a formula of the fatigue fracture section position and the fatigue life of the toughness material in the position at a multiaxis dynamic stresses state has been built.

关 键 词：韧性材料 应力状态 动态 

分 类 号：TH123.3[机械工程—机械设计及理论]