The fracture appearance showed that ductile fracture happened during tests at elevated temperature. 断口形貌显示，叠轧材料的高温断裂属于韧性断裂。
To predict the forming limit in sheet metal forming, a ductile fracture criterion is introduced into the finite element simulation. 摘要为了准确地预测板料成形极限，将韧性断裂准则引入到有限元模拟中。
