J042041 純銅の疲労損傷過程中の非線形超音波挙動の変化([J04204]超音波計測・解析法の新展開(4))

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In this study, we applied fatigue damage evaluation in pure copper plates subjected to zero-to-tension fatigue loading through monitoring of with non-contacting NRUS (nonlinear resonant ultrasound spectroscopy), and nonlinear three-wave interaction method, which is a resonance-based technique exploiting the significant nonlinear behavior of damaged materials. In NRUS, the resonant frequency of an object is studied as a function of the excitation level. As the excitation level increases, the elastic nonlinearity is manifest by a shift in the resonance frequency. In nonlinear three-wave interaction method, two intersecting ultrasonic waves produce a scattered wave when the resonance condition is satisfied. The wave amplitude is measured. NRUS and nonlinear three-wave interaction methods exhibit high sensitivity to microstructural change of the damaged material. It rapidly increases from 60 % of fatigue life to the fracture. This noncontact resonance-EMAT measurement can monitor the evolution of NRUS throughout the fatigue life and has a potential to assess the damage advance and to predict the fatigue life of metals.
一般社団法人日本機械学会の論文
2011-09-11