Patent ID: 6330827
Filing Date: 2001-12-18
Classification: G01N

Abstract:
A method for identifying components with defects using strains applied at acoustic and ultrasound frequencies, comprising the steps of:a. determining the relative resonance frequency shift .vertline..DELTA..function./.function..sub.0.vertline. as a function of applied strain for an acceptable component, where .function..sub.0 is the frequency of the resonance peak at the lowest amplitude of applied strain and .DELTA..function. is the frequency shift of the resonance peak as strain amplitude is increased to determine a reference relationship;b. determining the relative resonance frequency shift .vertline..DELTA..function./.function..sub.0.vertline. as a function of applied strain for a component under test, where .function..sub.0 is the frequency of the resonance peak at the lowest amplitude of applied strain and .DELTA..function. is the frequency shift of the resonance peak as strain amplitude is increased to determine a quality test relationship; andc. comparing the reference relationship with the quality test relationship to determine the presence of defects in the component under test.