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.
出处
《精密成形工程》
2011年第6期27-32,共6页
Journal of Netshape Forming Engineering
关键词
变形历史
累积损伤
断裂准则
体积成形
板成形
deformation history
cumulative damage
ductile fracture criteria
bulk forming
sheet metal forming
