Metal ductile fracture strain calculation method and system

The invention relates to a metal ductile fracture strain calculation method and system, and the method comprises the steps: decomposing a stress vector in a stress space, and obtaining a stress parameter; calibrating the initial calculation parameters based on the metal material to be measured to obtain calibrated calculation parameters; obtaining a Rode angle based on the stress parameter, and obtaining a Rode angle parameter based on the Rode angle; converting the stress space into a stress-strain space, and obtaining equivalent plastic strain based on the stress-strain space; obtaining a stress triaxial degree based on the equivalent plastic strain and the calibrated calculation parameters; and inputting the stress triaxial degree, the calibrated calculation parameter and the Rode angle parameter into a calculation model to obtain the fracture strain. The method is wide in application range and high in prediction precision. 本发明涉及一种金属延性断裂应变计算方法及系统，方法包括：对应力向量在应力空间中进行分解，得到应力参数；基于待测金属材料对初始的计算参数进行标定，得到标定的计算参数；基