SUS304鋼の高温多軸疲労寿命特性と破面形態の関係

概要

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In order to investigate the properties of biaxial low-cycle fatigue in SUS 304 stainless steel at elevated temperature, strain controlled, tension-compression-torsion fatigue tests were carried out under in-phase and out-of-phase conditions between axial and torsional strain cycling's. The fracture mode under the in-phase cycling was found to be classified into two types; i. e. Mode I and Mode II. It was also found that the fracture mode changed from Mode I to Mode II with an increase in the strain ratio, Δγ・Δε. On the other hand, under the out-of-phase cycling, the mixed failure of Mode I and Mode II was found from SEM fractographic observation. The in-phase fatigue life with the Mode I type failure was correlated well with the tensile strain energy and that with Mode II type failure the torsional strain energy. By using these correlations, the out-of-phase fatigue life could be predicted by the linear damage rule.
社団法人日本材料学会の論文
1988-03-15