压力容器用钢的应力状态与断裂模式的关系及其工程应用  

The Relation between Failure Models of Steels Used in Pressure Vessel and Stress-State and its Engineering Application

作　　者：王晓春[1] 郑津洋[1] 孙国有[1] 

机构地区：[1]浙江大学化工机械研究所

出　　处：《压力容器》2002年第3期13-15,40,共4页Pressure Vessel Technology

摘　　要：结合细观力学在金属韧性材料断裂中的研究成果 ,提出压力容器用钢的断裂模式有两种 :韧窝型断裂模式和剪切型断裂模式 ;决定这两种断裂模式的转变的是应力三轴度。应力三轴度是一种表征材料受力时的应力状态的度量。给出了压力容器用钢的应力状态与两种断裂模式的关系 。Based on some advances by means of meso-mechanics of ductile fracture of metals, two failure models of steels used in pressure vessel is proposed: one is dimple fracture, and another is shear-slip fracture. The transformation between the two models depends on the stress triaxiality in the region where failure takes place. The stress triaxiality is a kind of measure of stress-state of materials. The relation between failure models of steels used in pressure vessel and stress-state is given. And study the engineering application of the relation in the optimum design and the safe assessment of pressure vessel.

关 键 词：压力容器用钢 细观力学 应力状态 应力三轴度 断裂模式 

分 类 号：TH49[机械工程—机械制造及自动化] TG142.41[一般工业技术—材料科学与工程]