A Study on Creep-Fatigue Interaction of Polycrystalline Metal at Elevated Temperature : Specially, on the Effect of Hydrostatic Pressure on Crack Behavior.

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Sheet test specimen of commercial pure copper was used and tests on three types of stress waves were performed under atmospheric and hydrostatic pressures of 1000kg/cm^2 at 270℃. From the present experiments the following were concluded. At the same stress wave, time to rupture of the material under hydrostatic pressure was remarkably longer than that in atmosphere. In this connection, slower crack initiation and propagation rate were observed under hydrostatic pressure as compared to atmospheric pressure. From the calculation of both fatigue damage φ_f of the material and creep damage φ_c in the tests of fatigue with hold-time, the value of commulative damage, φ_c+φ_f, is larger than unity under both hydrostatic and atmospheric pressures. The fatigue damage of the material is predominant under hydrostatic pressure but the creep damage of the material is influential under atmospheric pressure.
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