【摘 要】
：
利用有限元软件研究了单次超载对异种金属焊接接头应力腐蚀裂纹扩展的影响。对由镍基合金182与高强度不锈钢A508组成的双材料焊接接头的裂尖应力、应变场进行了分析,得出裂尖
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利用有限元软件研究了单次超载对异种金属焊接接头应力腐蚀裂纹扩展的影响。对由镍基合金182与高强度不锈钢A508组成的双材料焊接接头的裂尖应力、应变场进行了分析,得出裂尖在超载后产生的力学变化。结果表明:超载使材料发生屈服,产生残余压缩应力;随着超载系数增大,裂尖残余压缩应力值变大;对于此种双材料焊接接头,裂尖最大应变值出现在裂尖前方-45°和45°方向。
The effect of single overload on the stress corrosion cracking propagation in dissimilar metal welded joint was studied by finite element software. The crack tip stress and strain field of the dual-material welded joint composed of Ni-based alloy 182 and high-strength stainless steel A508 were analyzed, and the mechanical changes of crack tip after overloading were obtained. The results show that the overloading causes the material to yield and generate residual compressive stress. As the overload coefficient increases, the residual compressive stress at the crack tip becomes larger. For the dual-material welded joint, the maximum strain at the crack tip appears in front of the crack tip ° and 45 ° directions.
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