8 April 2009 Experimental structural health monitoring of Z-fibre reinforced co-cured composite pi-joints using Lamb wave propagation
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Abstract
The goal of this research is to establish a methodology for damage detection in unreinforced and z-fiber reinforced cocured composite pi- joints using lamb wave based structural health monitoring technique. Because of the lack of natural reinforcement in the thickness direction, delamination has been a predominant failure mode besides other failure modes in laminated composites. Z-fiber reinforcement is one of the ways of controlling or delaying delamination and thus, delaying the failure. Here, DCB (Double Cantilever Beam) and Pi-Joint specimens, with and without z-fiber reinforcement, are considered for experimental analysis. Damage is experimentally induced in the specimen under static loading. Lamb wave propagation based structural health monitoring is performed using PZT sensors in a pitch-catch arrangement. Amplitude vs. time and amplitude vs. frequency response are plotted for various excitation frequencies. At lower frequencies (particularly at 20 KHz), pure A0 mode is generated, which is confirmed by out of phase response of simultaneous PZT sensors. From the response data analysis, presence of damage in unreinforced, z-fiber reinforced DCB and pi-joint specimens is confirmed.
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Hitesh Kapoor, Hitesh Kapoor, Som R. Soni, Som R. Soni, } "Experimental structural health monitoring of Z-fibre reinforced co-cured composite pi-joints using Lamb wave propagation", Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 72941C (8 April 2009); doi: 10.1117/12.817800; https://doi.org/10.1117/12.817800
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