应力/应变场对插销试验焊接接头氢扩散的影响

Effect of Stress and Plastic Strain on Hydrogen Diffusion In Welded Joint of Implant Test

采用ABAQUS有限元分析软件及有关焊接接头中氢扩散与集聚的计算模拟技术计算分析了不同外加载荷条件下插销试件的应力、应变场及其对氢扩散与聚集过程的影响。计算结果表明 ,静载拉伸条件下插销缺口前沿有明显的应力应变集中 ,随着外加载荷的增加 ,缺口尖端应力逐渐增大 ,但应力集中系数逐渐减小 ;在相同初始氢条件下 ,随着外加载荷的增加 ,缺口前沿应力应变集中部位氢的峰值浓度逐渐提高 ,氢浓度达到峰值的时间也逐渐增长。分析认为 ,插销缺口附近产生的应力应变集中是导致氢在该区域产生聚集的重要原因。

The stress/strain field and hydrogen diffusion in implant specimen under different external loads are calculated by ABAQUS finite element software and the simulation technology of hydrogen diffusion in weldment. The results show that there exists an evident stress/strain concentration area in the vicinity of implant notch, and the stress near the tip of implant notch increases with the raise of the external load, but the stress concentration factor decreases gradually. With the same initial hydrogen content, the diffusible hydrogen peak value appearing in the stress/strain concentration area near the tip of implant notch increases gradually with the raise of the external load, and the time at which the peak value appears is delayed correspondingly. It is concluded that the stress and strain concentration near the tip of the implant notch is the important reason for hydrogen accumulation in this area.