一种韧性断裂损伤力学建模方法及其应用  

A New Modeling Approach of Ductile Damage Mechanics and Its Applications

作　　者：张士宏[1] 宋鸿武[1] 徐勇[1] 程明[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016

出　　处：《精密成形工程》2011年第6期27-32,共6页Journal of Netshape Forming Engineering

摘　　要：基于连续损伤力学理论,综合考虑变形历史(温度、应变速率)对损伤的累积演化和临界损伤值的影响,提出了一种新的韧性断裂预测方法。建立了相应的韧性断裂准则,准确地预测了钛合金的热锻成形、镁合金的温热冲压成形和不锈钢板的液压成形过程中的破裂行为,表明该方法可以很好地用于存在变形历史的体积成形和板成形的成形极限预测。Based on continuum damage mechanical theory, a novel approach to predict ductile fractures was proposed considering the effect of deformation history including variations of temperature and strain rates and their distribution as well on cumulative damage evolution and critical damage value. Applications of the approach were discussed as examples in warm forming of Mg alloy sheets, hot forging of Ti alloys and hydraulic bulging of stainless steel sheet based on different ductile frac- ture criteria. The results showed that the novel approach could predict bulk forming and sheet metal forming well.

关 键 词：变形历史 累积损伤 断裂准则 体积成形 板成形 

分 类 号：TG311[金属学及工艺—金属压力加工]