S0301-2-1 SUS304鋼の軸ねじり疲労における非比例負荷効果におよぼす温度とひずみ速度の影響(疲労特性に及ぼす各種因子の影響(2))

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The PP (fast-fast) and CC (slow-slow) type combined push-pull and cyclic torsion tests have been conducted on thin-walled tubular specimens of SUS304 austenitic stainless steel at 623 K and 823 K in air under in-phase and 90 deg out-of-phase conditions, and the temperature and strain rate dependency of nonproportional loading effects on axial-torsional low cycle fatigue behaviors of SUS304 steel are examined. At 623K the reduction in life due to nonproportional loading is below a factor of 2 and the effects of strain rate on nonproportional test life is little, whereas, at 823 K, the reduction in life beyond a factor of 2 is observed in both in-phase and 90deg out-of phase straining CC tests and non-proportional loading effects are not observed in both PP and CC tests.
2009-09-12