Open Access

ABSTRACT

Existence of Non-propagating Micro-cracks under the Fatigue Limit

by S. Nishida¹, N. Hattori¹

1 Saga University, Honjyo-machi 1, Saga-shi, Saga, 840-8502, Japan

The International Conference on Computational & Experimental Engineering and Sciences 2007, 4(3), 179-186. https://doi.org/10.3970/icces.2007.004.179

Abstract

The authors have experimentally confirmed that the non-propagating microcracks are observed in the low carbon plain specimens subjected to the stress of fatigue limit by 1×107 cycles and not observed in those of pure copper and aluminum alloys etc.. In addition, there exists clear fatigue limit in typical austenitic stainless steel SUS304 but not exist the non-propagating micro-cracks subjected to the stress of fatigue limit by 1×107 cycles. On the other hand, there exist not only clear fatigue limit but also non-propagating micro-cracks in the high manganese austenitic steel (HMA 0.20%C steel). Then, the authors have focused to the existence of non-propagating micro-cracks under the fatigue limit and investigated the effect of carbon content on the above existence using SUS304 and high manganese austenitic steels (HMA steels) with changing its carbon content only and clarified that the limit of the existence of non-propagating micro-cracks under the stress of fatigue limit by 1×107 cycles is concluded to be between 0.10% ∼0.20% of carbon content.

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