Adhesive Layer Effects on PZT-induced Lamb Waves at Elevated Temperatures

The role of the adhesive layer on PZT-induced Lamb wave propagation in structures exposed to elevated temperatures is presented in this article. Both experiments and numerical simulations were performed to study the effects of the adhesive layer on sensor signal at elevated temperatures. Experimentally, signals from PZT transducers with different adhesive thicknesses (40 and 120 μm) were investigated up to 500 kHz. In model simulations, the spectral element package (PESEA), which was developed previously, was adopted to simulate the test results. The simulations agreed with the experimental data quite well. Parametric studies were was then performed using PESEA to evaluate the effect of adhesive layer on PZT-induced Lamb wave propagation at elevated temperatures as compared to other mechanical properties of the host structure and PZT materials; these studies revealed that the stiffness change of adhesive layer due to temperature is the most influential parameter for the change in sensor signals as compared to other mechanical properties, and that the thickness of the adhesive layer can affect a sensor signal in a different manner at elevated temperatures. This study shows PESEA can reasonably simulate the adhesive layer effect at elevated temperatures and hence can be a useful tool for understanding the behavior of Lamb wave propagation generated by adhesively bonded PZTs on structures.

[1]  C. M. Percival,et al.  Elevated-temperature elastic moduli of 2024 aluminum obtained by a laser-pulse technique , 1970 .

[2]  A. Patera.  A spectral element method for fluid dynamics: Laminar flow in a channel expansion , 1984 .

[3]  M. Hooker.  Properties of PZT-Based Piezoelectric Ceramics Between-150 and 250°C , 1998 .

[4]  D. Komatitsch,et al.  The spectral element method: An efficient tool to simulate the seismic response of 2D and 3D geological structures , 1998, Bulletin of the Seismological Society of America.

[5]  Youn-Seo Roh.  Built-in diagnostics for identifying an anomaly in plates using wave scattering , 1998 .

[6]  D Komatitsch,et al.  CASTILLO-COVARRUBIAS JM, SANCHEZ-SESMA FJ. THE SPECTRAL ELEMENT METHOD FOR ELASTIC WAVE EQUATIONS-APPLICATION TO 2-D AND 3-D SEISMIC PROBLEMS , 1999 .

[7]  S. Sherrit,et al.  Temperature Dependence of the Dielectric, Elastic and Piezoelectric Material Constants of Lead Zirconate Titanate Ceramics , 1999 .

[8]  D. Komatitsch,et al.  Simulation of anisotropic wave propagation based upon a spectral element method , 2000 .

[9]  Hoon Sohn,et al.  Damage diagnosis using time series analysis of vibration signals , 2001 .

[10]  Constantinos Soutis,et al.  Structural Health Monitoring in Composite Materials Using Lamb Wave Methods , 2001 .

[11]  Constantinos Soutis,et al.  Damage detection in composite materials using lamb wave methods , 2002 .

[12]  Graeme Manson,et al.  Environmental Effects on Lamb Wave Responses from Piezoceramic Sensors , 2003 .

[13]  F. Chang,et al.  Detection and monitoring of hidden fatigue crack growth using a built-in piezoelectric sensor/actuator network: I. Diagnostics , 2004 .

[14]  Fu-Kuo Chang,et al.  Verification of a built-in health monitoring system for bolted thermal protection panels , 2005, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[15]  Carlos E. S. Cesnik,et al.  Studies on effects of elevated temperature for guided-wave structural health monitoring , 2007, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[16]  Fu-Kuo Chang,et al.  Time-Domain Spectral Element Method for Built-In Piezoelectric-Actuator-Induced Lamb Wave Propagation Analysis , 2008 .

[17]  S. Salamone,et al.  Temperature effects in ultrasonic Lamb wave structural health monitoring systems. , 2008, The Journal of the Acoustical Society of America.

[18]  Salvatore Salamone,et al.  Temperature effects in Lamb-wave structural health monitoring systems , 2009, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[19]  Fu-Kuo Chang,et al.  Optimizing a spectral element for modeling PZT-induced Lamb wave propagation in thin plates , 2009 .

[20]  Fu-Kuo Chang,et al.  Adhesive interface layer effects in PZT-induced Lamb wave propagation , 2010 .