1329 引張り予ひずみした構造用鋼のねじり疲労特性に及ぼす炭素量の影響(S21-4 疲労破壊機構,S21 金属材料の疲労特性と破壊機構)

概要

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In the present study, the effects of carbon content on the tortional fatigue properties have been investigated using four kinds of structural carbon steels, S15C, S25C, S35C and S45C with different tensile pre-strain ratios, in the view-point of fatigue strength, crack initiation and propagation and the non-propagating crack behaviors. According to the experimental results and observation of crack propagation behaviors, the main results obtained in this study are as follows: (1) The increasing of carbon content improves the fatigue strength of test materials with the same tensile pre-strain ratio. (2) Carbon content difference does not affect the initiation point, crack branch point and branch direction of the torsional fatigue cracks. (3) The length of the non-propagating cracks decreases with the increasing of carbon content for materials with the same tensile pre-strain ratio.
2005-09-18