CAJ | 학술논문

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。
기우련속손상역학이론,종합고필변형역사（온도、응변속솔）대손상적루적연화화림계손상치적영향,제출료일충신적인성단렬예측방법。건립료상응적인성단렬준칙,준학지예측료태합금적열단성형、미합금적온열충압성형화불수강판적액압성형과정중적파렬행위,표명해방법가이흔호지용우존재변형역사적체적성형화판성형적성형겁한예측。
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.