Influence of Mean Stress on Crack Closure Phenomenon and Fatigue Crack Propagation
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概要
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Measurements and observations on the closure of fatigue crack initiated from notch roots in an annealed and a quenched-and-tempered 0.54% carbon steel in tension-compression fatigue tests were made successively while increasing the stress level, in order to investigate the influence of mean stress on fatigue crack propagation and crack closure phenomenon. The following are the results obtained: (1) The crack closure phenomenon in tension-compression fatigue can be recognized more clearly in the annealed steel than in the tempered steel. (2) The crack propagation rate dl/dN can be expressed as [numerical formula] where Δσ_<eff> means the effective stress range under which the crack is fully open and l is the crack length. The exponent m is about 1.6 for the annealed steel and about 3 for the tempered steel. Mean stress affects Δσ_<eff> alone, therefore, the constant C is not related to the mean stress.
- 一般社団法人日本機械学会の論文
著者
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TAKAO Ken-ichi
Faculty of Pharmaceutical Sciences, Science University of Tokyo
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Nisitani Hironobu
Faculty of Engineering, Kyushu University
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Takao Ken-ichi
Faculty Of Science And Engineering Saga University
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Nisitani Hironobu
Faculty Of Engineering Kyushu University
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