傾斜機能材料の熱弾塑性応力解析と最適材料設計

概要

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Equivalent inclusion method was applied to the functionally gradient material (FGM) of ceramic and metal to evaluate the work hardening constants and thermal conductivity. Thermal and stress analyses of FGM were performed by the two-dimensional finite-element method. In order to reduce the sintered residual stresses, thermal stresses at thermal loading and total residual stresses after cooling, the compositional profiles of FGM were analysed. Based on the results, optimum material design of FGM for thermal loading was performed. The results obtained are as follows. (1) The optimum material design conditions under the operation conditions are that (i) the material pair should be ZrO_2 and SUS304, (ii) FGM should consist of five layers, and (iii) the compositional profile should have a gentle slope on the ZrO_2 side. (2) The tensile residual stresses after cooling are larger than the sintered residual stresses, because the maximum stress at the thermal loading is beyond the yield stress. (3) The optimum material design for the stress for a given operation condition can be determined by the method developed in this study.
一般社団法人日本機械学会の論文
1993-03-25