Effects of creep on mechanical fields nearby crack tip in weld joints

摘要

Stress and strain differences nearby crack tip caused by material heterogeneity of welded joints willeventually affect the stress corrosion cracking growth rate. By using 316 stainless steel and Inconel82 as the base metal and weld metal, the effects of creep on mechanical fields nearby crack tip inweld joints were studied by finite element method with one inch compact tension specimen. Theresults indicate that yield strength has greater impact on the mechanical field nearby crack tip;the material which has lower yield stress and larger creep rate will lead to lower stress and largerstrain at crack tip. When two different metals are welded together, the stress and strain in weldfusion line specimen is mainly dominant by creep of the metal with larger creep strain rate.Moreover, the creep effects on equivalent plastic strain and plastic zone are insignificant nomatter where the crack tip locates in weld joints.