Application of Finite Element Method for Analysis on Process of Stress Relief Annealing

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In order to analyze theoretically creep behaviors accompanying stress relief annealing, the authors applied their theory of thermal elastic-plastic creep analysis based on the finite element method, which is extended in this study. The present theory takes account of temperature dependency of mechanical and creep properties, and is able to analyze thermal elastic-plastic and creep behaviors using any creep law, for example, the power, the exponential, the time-hardening and the strain-hardening creep ones which are dealt with in this paper. Examples were analyzed for two kinds of creep laws, the power creep and the exponential laws, which are observed in such material as quenched and tempered H.T.60. The solution by this method assures its good convergence for a comparatively large time increment because changes of the creep properties and effect of stress variation in a time increment are considered. The results of analysis show good coincidence with the experiment. By this method, the behavior of welded joints revealed during the entire thermal cycle, from welding to stress relief annealing, can be analyzed consistently.
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