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- W2106812397 abstract "An analytical model of plasticity-induced crack closure is presented that is consistent with self-similar fatigue crack growth, where the plastic zone size and the plastic-wake thickness increase linearly with increasing crack length. The Dugdale model is used to represent crack tip plasticity, which allows the problem to be solved analytically. Detailed results are presented for the key model variables as a function of stress range and load ratio, in particular for the cyclic crack-tip opening displacement which can serve as a correlating parameter for crack growth rates, both within and beyond the small-scale yielding limit. For cases where the crack growth rate is proportional to the cyclic crack-tip opening displacement, results are presented for the variation of the exponent n characterising the dependence of growth rate on the stress range. It is noted that while n=2 in the small-scale yielding limit, as required for consistency with linear elastic fracture mechanics in that limit, the value of n deviates significantly from the small-scale yielding limit, even for applied stresses just above one-fifth of material yield stress. The present model can also be applied to fatigue crack growth under fully-plastic remote loading, with an appropriate choice for the limit stress and the modulus. This is shown to be particularly relevant for predicting small-crack growth rates at notch roots, in the presence of substantial notch-root plasticity. It is noted that small-crack growth rates predicted by previous models would be significantly unconservative relative to predictions from the present model." @default.
- W2106812397 created "2016-06-24" @default.
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- W2106812397 date "2001-02-01" @default.
- W2106812397 modified "2023-09-30" @default.
- W2106812397 title "Self-similar analysis of plasticity-induced closure of small fatigue cracks" @default.
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- W2106812397 doi "https://doi.org/10.1016/s0022-5096(00)00024-7" @default.
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