A Study on Creep- Fatigue Interaction of Polycristalline Metals at Elevated Temperature : Especially, Based on the Crack Behaviors

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Experiments of static creep, full reversed low-cycle fatigue and low-cycle fatigue with hole-time in tension were performed using commercial pure copper specimens at 270℃. Number of cycles to rupture of the specimen in fatigue with hold-time is smaller than that in pure fatigue, and this holes for the basis of time to rupture. Both crack initiation damage φ_i and propagation damage φ_p of the material computed by linear damage rule are nearly equal to unity. In the fatigue test with hold-time, the reversed loading from tension to compression results in a slower rate of crack propagation and this is interpreted from the dislocation model.
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