This study examines the effect of Type-B liquid metal embrittlement (LME) cracks on high-cycle fatigue resistance of a spot-welded plate of transformation-induced plasticity (TRIP) steel. Tensile shear and cross tension were employed to simulate a spot-welded component subjected to a complex state of stress. Interestingly, neither the existence nor the depth of Type-B LME cracks changed the high-cycle fatigue resistance of the spot-welded samples under the two deformation modes tested. The finite-element analysis revealed the formation of maximum local stress at the sample notch, which acted as a crack-initiation site. It should be noted that this site was not changed even upon adding a Type-B LME crack to the simulation model.

中文翻译：

---

B型液态金属脆性裂纹对点焊1180 TRIP钢高周疲劳性能的影响

本研究检验了 B 型液态金属脆化 (LME) 裂纹对相变诱导塑性 (TRIP) 钢点焊板的高周疲劳强度的影响。使用拉伸剪切和横向张力来模拟承受复杂应力状态的点焊部件。有趣的是，B 型 LME 裂纹的存在和深度均未改变点焊样品在两种变形模式下的高周疲劳强度。有限元分析表明，在样品缺口处形成了最大的局部应力，作为裂纹起始点。应该注意的是，即使在模拟模型中添加 Type-B LME 裂缝，该站点也没有改变。