压电材料兰姆波方法在薄板损伤检测中的数值仿真

Numerical simulation of piezoelectric sensor Lamb wave method for plate damage detection

利用压电材料(PZT)对薄板结构中的裂纹进行损伤检测与定位,通过数值仿真说明了该方法的有效性.基于大型有限元软件ANSYS平台,利用其中的耦合场单元,建立了薄板与压电材料的耦合动力学模型.利用PZT的传感/作动功能在薄板中激发和接收Lamb波,对板中存在多种裂纹情况通过对Lamb波传播过程和检测的数值仿真进行了研究.通过时域分析法对裂纹存在下Lamb波传播进行分析,研究裂纹角度对PZT响应的影响,采用时间延迟法对裂纹进行损伤定位.

Crack detection with piezoelectric（PZT）sensors is emerging as an effective and powerful technique in structural damage detection.Wafers or patches made of PZT can be used as both actuators and sensors;and their electrical impedance can be used as identifier for changes in the dynamic characteristics of host structures.This goal of this paper is to use the finite element method to simulate the structural damage detection methods with PZT.By using the coupled field elements of the ANSYS,this paper uses transient dynamic finite element modeling to examine the response of a plate to excitation by bonded piezoelectric transducers.Time-domain analysis method is used to analyze the Lamb waves about kinds of cracks.The type and angle of the cracks are studied,time-delay estimation method is used to locate the given defects.