EFFECT OF NON-PROPORTIONAL OVERLOADING ON FATIGUE CRACK GROWTH

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GAO Hua CHEN Youxuan LI Ming Shanghai University of Engineering Science
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non-proportional overloading; fatigue crack growth; mixed mode loading;
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The effect of proportional and non-proportional overloading on mode l fatigue crack growthhave been studied,and the influences of crack tip plastic zone,crack tip blunting as well ascrack closure were discussed.Proportional(model I)overloading may cause more seriouscrack growth retardation than non-proportional(mixed mode)overloading.Therefore,forestimating the fatigue life of engineering structures to simplify a real overload which may of-ten be non-proportional as a proportional one is not always safe.
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页码:59 / 64
页数:6
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