The transferability of continuum damage parameters for ductile fracture from CT specimen to pipe has been investigated for 316LN stainless steel. The authors have earlier established crack initiation stress and crack evolution energy as damage parameters for 316LN SS, based on coupled experimental and numerical analysis. Using these fracture parameters, XFEM crack growth simulations were carried out for through-wall circumferentially cracked straight pipes of 80NB diameter. To verify the applicability of damage parameters for various crack geometries, the stress triaxiality ahead of a growing crack in CT specimen and through wall crack in pipes has been assessed. The average triaxiality for CT specimen is 1.25 and for the pipes, it varies from 0.4 to 0.62 depending on initial through wall crack size. The predicted maximum load, load-displacement response, crack growth and pipe ovality are compared with the experimental results.

对于316LN不锈钢，已经研究了延展性破坏参数从CT试样到管材的连续传递参数的可传递性。基于耦合的实验和数值分析，作者已经较早地建立了裂纹萌生应力和裂纹扩展能量作为316LN SS的损伤参数。使用这些断裂参数，对直径为80NB的贯穿壁圆周裂纹的直管进行了XFEM裂纹扩展模拟。为了验证损伤参数对各种几何形状的适用性，已经评估了在CT试样中裂纹扩展之前以及管道中壁裂纹通过之前的应力三轴性。CT样品的平均三轴度为1.25，对于管道，其平均三轴度在0.4到0.62之间变化，具体取决于初始贯穿壁的裂缝尺寸。预计的最大负载，