Studies on the Fatigue Crack Initiation and Propagation : Report 1, Effects of Crack Length, Stress Range and Minimum Stress on Fatigue Crack Propagation

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The fatigue crack propagation behaviors were investigated on HT80 steel plates under net section stress control in which stress range and minimum stresses were widely varied. The fatigue crack growth rates were proportional to the effective crack length 2ae which was an actual crack length 2a modified by the finite width effect of the specimen. When minimum stress δmin was in compression side, the growth rate depended on maximum stress δmax and in tension side, it depended on stress range Δδn. As the result, the effects of crack length, stress range and minimum stress on the fatigue crack propagation can unifyingly be shown such that the crack growth rate is proportional to the cyclic plastic zone size at a crack tip[numerical formula]. Where, δy is yield strength of material and δn is δmax when δmin≤0 and is Δδn When δmin≥0

収録刊行物

  • Bulletin of JSME

    Bulletin of JSME 17 (103), 22-31, 1974

    一般社団法人 日本機械学会

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