JP Journal of Solids and Structures
Volume 2, Issue 1, Pages 69 - 82
(March 2008)
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OPTIMIZATION OF LAMB WAVE PROPAGATION PARAMETERS FOR DAMAGE DETECTION IN COMPOSITE MATERIALS
Ch. Ratnam (India), B. Satish Ben (India) and B. Avinash Ben (India)
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Abstract:
The efficient and reliable damage detection is critical for the utilization of composite materials. There is currently no standard or even a best-practice precedent for damage detection via Lamb wave testing. Several procedures have been developed in the literature, each with valuable characteristics. The goal of the present work is to determine experimentally and analytically the effects of various parameters on the sensitivity of damage detection. These parameters are divided into three categories: actuator and sensor geometry, actuation pulse, and specimen properties. The effects of the PZT dimensions coming under first category are not explored thoroughly in this research however, since much literature exists on this topic, however the second category of variables, i.e., the actuation pulse parameters are explored very much. These included the pulse shape, amplitude, frequency and number of cycles to be sent during each pulse period. These parameters were varied experimentally on a test specimen to observe their effects on the generated waves.
The effects of the parameters on the generated waves in a test specimen are observed experimentally and optimal values of parameters for damage detection are arrived. |
| Keywords and phrases: Lamb wave, propagation parameters, damage detection, composites. |
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