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单次超载对异种金属焊接接头应力腐蚀裂纹尖端力学场的影响

Fan YANG,He XUE,Jianwei SUN,Yinghao CUI

Hot Working Technology（2017）

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Abstract
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.
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