In situ monitoring of plastic deformation using ultrasound

الأصل · EN

Ultrasound has long been used as a non-destructive tool to test for the brittle fracture of materials. Could it be used as a similar tool to test for ductile failure? This study reports results of local measurements of the speed of shear waves, vₜ, in aluminum under standard testing conditions at two different locations on the same sample, as a function of stress. There is a clear change in vₜ at the Yield stress, consistent with a proliferation of dislocations. This measurement provides a quantitative, continuous relation between dislocation density and externally applied stress.