A thermal sensitivity-based approach for enhancing robustness of ultrasonic evaluation of material acoustic nonlinearity

摘要

Despite demonstrated effectiveness in characterizing material properties or defect, the evaluation of material acousticnonlinearity is highly prone to measurement contaminations introduced by various practical factors and the low robustnessrestricts its application. In order to obtain a precise quantification of the material acoustic nonlinearity in a robust manner,an approach based on the thermal fluctuations in nonlinear features of ultrasonic waves is developed. In this approach, theinfluence of temperature and defect on the interatomic distance is scrutinized analytically, and on this basis, the nonlinearfeatures of ultrasonic waves linked with the temperature and defect is ascertained explicitly, whereby a thermal sensitivityindex is proposed. With this thermal sensitivity index, the material acoustic nonlinearity can be evaluated without beingaffected by contaminations from practical sources, and therefore the defect which intensifies the material acousticnonlinearity can be identified in a robust manner. Experimental validation corroborates the theoretical prediction,demonstrating that the proposed thermal sensitivity-based approach is capable of enhancing the robustness of materialacoustic nonlinearity evaluation and defect characterization.