为了研究裂纹长度对异种金属焊接接头裂纹扩展驱动力的影响，采用机械预压缩法在裂纹前端引入残余应力，模拟了残余应力与外加载荷共同作用下焊接接头紧凑拉伸试样裂纹端部应力应变的分布。结果表明：裂纹长度会引起裂纹前缘残余应力场的显著改变；由于材料力学性能不均匀导致的焊缝界面处的应力偏差，会引起裂纹扩展方向发生变化；低屈服强度材料对应着更高的应力三轴度，裂纹的萌生，起裂和扩展都容易出现在镍基合金焊缝中。与长裂纹相比，短裂纹更容易发生起裂和扩展。
In order to study the effect of crack length on the driving force of crack propagation in dissimilar metal welded joints, the residual stress was introduced at the crack front by the mechanical pre-compression method. The distribution of stress and strain at the crack front of compact tensile specimens in the welded joint under the combined action of residual stress and applied load was simulated. The results show that the residual stress field at the crack front has significantly changed because of the crack length. The stress deviation at the welded interface caused by the non-uniform material mechanical properties can lead to the change of crack propagation direction. Material of low yield strength corresponds to higher stress triaxiality. Crack initiation and its propagation are likely to occur in nickel-based alloy welds. Compared with long cracks, short cracks are more prone to initiate and propagate.
2022,44(13): 76-80 收稿日期：2021-09-16
DOI：10.3404/j.issn.1672-7649.2022.13.018
分类号：TG407
基金项目：陕西省自然科学基础研究计划资助项目（2020JM-523, 2021JM-389）
作者简介：石哲任(1998-),男,硕士研究生,研究方向为计算机辅助工程分析
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