Rokhlin S I, Wang L, Xie B, Yakovlev V A, Adler L
The Ohio State University, Edison Joining Technology Center, Nondestructive Evaluation Program, 1248 Arthur E. Adams Dr., Columbus, OH 43221, USA.
Ultrasonics. 2004 Apr;42(1-9):1037-47. doi: 10.1016/j.ultras.2003.12.025.
An experimental method incorporating high frequency pulsed angle beam ultrasonic measurements modulated by low frequency vibrations of a bonded structure is described. This method uses parametric/nonlinear mixing between high and low frequencies to characterize adhesive degradation. It is demonstrated that good quality (undamaged) bonds exhibit little dependence of ultrasonic signature on the overlay of low frequency vibration loads; however, environmentally degraded or imperfect bonds exhibit strong modulation of the resonance frequency of the ultrasonic signal reflected from the bond. The results are interpreted using a model for normal and oblique wave interaction with two nonlinear interfaces separated by an adhesive layer under quasi-static stress modulation.
描述了一种实验方法，该方法结合了由粘结结构的低频振动调制的高频脉冲角束超声测量。此方法利用高频与低频之间的参量/非线性混合来表征胶粘剂的降解。结果表明，质量良好（未损坏）的粘结对超声特征几乎不依赖于低频振动载荷的叠加；然而，环境降解或不完善的粘结对从粘结处反射的超声信号的共振频率表现出强烈的调制。使用一个模型来解释这些结果，该模型用于描述在准静态应力调制下，由胶粘剂层分隔的两个非线性界面的法向波和斜向波相互作用。
