Abstract
Abstract— The pressure‐overload method for proof‐testing pressure‐vessels was investigated for hydrofilters made of an Al‐alloy. After a vessel had been overloaded using a hydrostatic fluid, the fatigue crack growth rate of the material was studied at three levels of hydrodynamic pressure. The period of fatigue crack growth Np and the uniaxial equivalent stress σe were calculated on the basis of fractographic analyses for various combinations of the hydrostatic overload and the hydrodynamic pressure. Increasing the overload level increased Np, and decreased σe. For a pressure overload of 3 times the normal pressure the initiation of a fatigue crack did not occur after 2 × 106 cycles of loading at an hydrodynamic pressure of 20.6 MPa. Striation spacing could not be correlated against the value of the hydrodynamic pressure after an overload of 2.5 times the normal pressure. A unified relationship between the durability Nd and the ratio Np/Nd (=Ndp) at different hydrodynamic fluid pressures was demonstrated.
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