OPCM AE传感器特性的理论仿真与实验研究

基于均匀场和细观力学理论,对应用于结构损伤声发射(AE)检测的1-1型压电复合材料(OPCM)AE传感器,建立了它的等效力电模型,在此基础上,推出了其等效力、电参数,通过这些参数的对比,发现OPCM具有明显的正交异性的特性;同时,应用有限元仿真计算,得到了在x和z两方向上传感器受到单向应力波荷载作用时,电极面输出的电压存在明显差异;所设计的实验表明:OPCM能够区分出不同方向的应力波,并对特殊方向上的应力波具有强烈的响应,再次证实了OPCM传感器的正交异性特性。

Principled simulation and test research on performance of OPCM AE sensor

Based on the theories of uniform fields and micromechanics,for the 1-1 orthotropic piezoelectric composites materials(OPCM) sensors in structural damage acoustic emission(AE) test,equivalent electromechanical model is established and some equivalent electromechanicl parameters are derived,comparing these parameters the distinct orthotropic performance of OPCM is discovered.The result is gained that the sensor electrode volt outputs have evidence difference under the actions of the unilateral stress wave in x and/or z direction by finite element mothods simulation.The result of theorthotropic performace that OPCM AE sensors can distinguish stress waves from the different directions is obtained further by the designed experiment.The experiment indicates that the OPCM AE sensor has strong response to stress wave from special direction.