Fatigue Life Extension of a Through-Thickness Crack Using Local Heating

摘要

On the basis of the beneficial effect of compressive residual stresses oncrack growth retardation, artificial compressive residual stress fieldswere induced to the through-thickness crack by local heating near thecrack tip. To verify the delaying effect of the proposed technique, crackgrowth tests and some numerical analyses were carried out on threetypes of CT specimens in accordance with ASTM standard. Based onthe results of tests and analyses, the retardation of fatigue crack growthwas discussed quantitatively.