摘要
提出了一种基于有限宽超声束反射的固-固界面退化特性评价方法,从理论和数值仿真角度进行了分析和计算。将两固体界面间的薄层简化为界面弹簧模型,以界面法向和切向劲度系数表征界面的退化程度。通过数值计算求得有限宽超声纵波束在不同入射角和界面不同退化程度下的反射横波、反射纵波的镜面反射系数。进一步地,通过建立二维有限元模型,仿真研究了有限宽超声纵波束在给定入射角及界面不同退化程度下镜面反射系数的变化规律。结果表明,反射纵波和反射横波的镜面反射系数随有限宽超声纵波束的入射角及界面劲度系数的改变而变化,且存在镜面反射系数随界面劲度系数单调且敏感变化的入射角,据此可准确评价界面的退化程度。
An approach based on the acoustic reflection of a bounded ultrasonic beam is proposed for the degradation evaluation of interfacial degradation of the solid-solid. Theoretical analysis and numerical simulation are implemented. By using a spring model for simulating the interface between the two solids, the interfacial degradation can be characterized by the normal stiffness coefficient sand tangential interfacial stiffness coefficients. Under the conditions of different incident angles of a bounded ultrasonic longitudinal wave beam width and different degrees of interfacial degradation, the specular reflection coefficients of the reflected longitudinal waves and the transverse waves are obtained through numerical calculation. Furthermore, at a given incident angle, the variation of different degrees of the interfacial degradation on the specular reflection coefficient is also obtained by a 2D finite element model. It is shown that the specular reflection coefficients of the reflected longitudinal and transverse waves change with the incident angle of the bounded ultrasonic longitudinal wave beam and the interfacial stiffness coefficient. A specific incident angle in which the specular reflection coefficient changes sensitively and monotonously with the interfacial stiffness coefficient is found,which can be used to accurately evaluate the degree of interfacial degradation.
作者
徐帆
吴坤
许才彬
邓明晰
XU Fan;WU Kun;XU Caibin;DENG Mingxi(College of Aerospace Engineering,Chongqing University,Chongqing 400044,China)
出处
《应用声学》
CSCD
北大核心
2023年第1期123-130,共8页
Journal of Applied Acoustics
基金
国家自然科学基金项目(12134002)。
关键词
有限宽超声束
镜面反射系数
界面退化特性
Bounded ultrasonic beam
Specular reflection coefficient
Interfacial degradation characteristics
