Prediction of Stress Corrosion Crack Propagation Behavior in Residual Stress Field of Type 304 Stainless Steel Welded Joint

概要

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Crack propagation features of stress corrosion cracking (SCC) of type 304 stainless steel in 42% MgCl_2 solution were studied and it was made clear that crack growth rate was represented well by the following equation. da/dt = C(K^2-K^2_ISCC)・・・・・(1) da/dt: Crack growth rate, K: Stress intensity factor, C: Constant, K_ISCC: Threshold stress intensity factor for SCC In residual stress field of welded joint, crack propagation behavior of SCC was predicted by the following integrated from of equation (1), as an example of application to a nearly practical problem. t=∫da/C(K_2-K^2_ISCC・・・・・( 2 ) K for arbitrary crack length in welded joint was calculated by method of superposition. And the integration mentioned above can be done by Sympson's integration with computer. When the residual stress distribution in non-cracked plates is already known, crack propagation behavior of SCC can be predicted by numerical analysis of equation (2). Namely, crack length in arbitrary time and arresting point of crack with a decreasing of potential energy in system, or welded joint, can be predicted within permissible errors.
社団法人溶接学会の論文
1983-10-01