复合层合梁层裂损伤与超声导波的相互作用研究  

Study of Interactions Between Delamination Damage in a Laminated Composite Beam and Ultrasonic Guided Wave

作　　者：许伯强[1] 来锴 徐桂东[1] 徐晨光[1] 

机构地区：[1]江苏大学理学院,江苏镇江212013

出　　处：《电子科技》2015年第11期55-60,共6页Electronic Science and Technology

基　　金：国家自然科学基金资助项目(11172114);江苏省六大人才高峰基金资助项目(2012-ZBZZ-027)

摘　　要：基于谱有限元法(SFEM),建立了压电晶片驱动/传感与各向异性层状复合梁耦合的谱有限元模型,数值模拟研究了耦合系统超声导波的激发、传播特征,并分析了导波与损伤的相互作用。模型中复合梁采用铁木辛柯梁理论、压电晶片层采用欧拉伯努利梁理论,利用哈密顿原理得到梁/压电晶片的时域耦合运动控制方程和边界条件,通过快速傅里叶变换将耦合运动控制方程转换至频域可导出谱有限元模型。与有限元分析结果比较表明,所建模型可精确模拟复合梁中导波的传播且计算效率高。进而分析了导波和层裂损伤的相互作用,结果表明导波在缺陷处会产生反射,且反射信号到达压电传感器的时间和幅值与缺陷的位置及长度有关。Based on the spectral finite element method （SFEM）, a spectral finite element model is developed for a delaminated laminated composite beam coupled with a guided wave excitation and propagation characteristics of the surface-bonded piezoelectric actuator/sensor. Ultrasonic coupling system are researched by numerical simulation, and the interactions between the guided wave and the defect are analyzed. The composite beam is based on the Timo- shenko beam theory and the piezoelectric wafer layer is represented by the Euler Bernoulli beam theory in the model. The beam/piezoelectric wafer coupled governing motion equations and the boundary conditions in time domain are ob- tained by using the Hamilton＇s principle, and then the spectral finite element model is formulated by transforming the coupled governing equations into frequency domain via the discrete Fourier transform. The high calculation efficiency and the ability of the present model to accurately predict the wave propagation in the composite beam are verified by comparing with the finite element method results. Then the interactions between the waves and the damage are dis- cussed. The results show that the guided wave can generate reflection wave from the defect, and that the arrival tim,＊ and the amplitude of the length of the defect.

关 键 词：复合材料层合梁 层裂损伤 谱有限元模型 压电晶片驱动/传感 

分 类 号：TN04[电子电信—物理电子学] O422[理学—声学]