This paper proposes a numerical method to simulate ductile fracture of a cracked pipe using small punch test data. The method is using FE damage analysis method based on the multi-axial fracture strain energy density model. The parameters in the damage model can be extracted solely from small punch test data, using which compact tension and circumferential through-wall cracked pipe tests are simulated. To validate the proposed method, simulation results are compared with TP316L experimental data. For the compact tension test, faster crack growth is predicted but for the pipe test, good agreement is obtained. The effect of the stress triaxiality on the prediction accuracy is discussed.

本文提出了一种利用小冲头试验数据模拟裂纹管延性断裂的数值方法。该方法采用基于多轴断裂应变能密度模型的有限元损伤分析方法。损伤模型中的参数可以仅从较小的冲头测试数据中提取，使用该数据可以模拟紧凑的张力和周向贯穿壁的裂管测试。为了验证该方法的有效性，将仿真结果与TP316L实验数据进行了比较。对于紧凑的拉伸测试，可以预测裂纹扩展更快，但是对于管道测试，则可以得到很好的一致性。讨论了应力三轴度对预测精度的影响。