固体滑移界面的超声评价

Ultrasonic evaluation for the splip interface between two solids

为评价固体滑移界面的特性,根据QSM界面模型和粘滞流体的本构方程导出了滑移界面的界面劲度系数及垂直入射到固体滑移界面的超声纵波和SH波的反射系数公式,其中纵波的反射系数与滑移界面层的绝热体积弹性模量、粘滞系数和入射声波的频率有关,而SH波的反射系数与界面层的绝热体积弹性模量和入射波的频率无关。因此,可以用SH波直接评价界面的不同粘滞状态,且不受检测频率的限制。要评价界面的绝热体积弹性模量,则必须增加纵波检测。利用蜂蜜和水模拟不同滑移界面层的声波反射实验验证了上述理论结果。

To evaluate the properties of the slip interface between two solids, its stiffness coefficients and the reflection coefficients of ultrasonic longitudinal and shear horizontal waves at vertical incidence are derived based on QSM model and the constitutive equations of viscous fluid, where the reflection coefficient for longitudinal wave is dependent on the adiabatic bulk module, viscous coefficient of interface and frequency of the wave, but for SH wave it is independent on the adiabatic bulk module and frequency. Accordingly, the viscosity of slip interface can be estimated directly by SH wave without any frequency limits. As to the adiabatic bulk module, additional evaluation by longitudinal wave must be employed too. The experimental results obtained from slip interfaces simulated by honey and water demonstrate the validity of the theory.