耐熱鋳造合金の高温疲労変形の評価

概要

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This paper deals with the cumulative inelastic deformation (cyclic creep deformation) under cyclic loading. From the viewpoint of practical use, an attempt was made to evaluate the cyclic creep deformation by the finite element method based on the conventional creep analysis. In order to examine the fundamental properties of the cyclic deformation of a Fe-based cast heat-resistant alloy (XF818), the basic tests were carried out at various temperatures (500, 600, 700℃) and stress range lebels (113, 226, 339 MPa) under the uniaxial load condition of constant stress ratio (R=0). By using the test results, the behavior of cyclic creep deformation of the material was expressed by an equation including the stress range, temperature and number of cycles so as to apply to the numerical analysis for estimation of the cyclic creep deformation. In the analysis, the conventional finite element creep analysis was employed by use of the time hardening deformation rule, replacing the elapsed time with the number of cycles. The finite element analyses and cyclic creep tests was carried out for two kinds of specimens in the conditions of temperature and stress distributions. From the comparison between the analytical and experimental results, the applicability of the proposed method was confirmed.
社団法人日本材料学会の論文
1992-07-15