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Delamination Detection in Laminated Composite with Uncertainty Due to Material Degradation in Damaged Region



Ultrasonic guided wave sensitivity to damage severity in a laminated composite due to impact induced matrix crack is investigated. Ultrasonic guided wave has certain advantages such as long-range propagation without much attenuation, ability to bring damage induced signature from buried location. Those advantages can be exploited to monitor larger area of a complex structure with a few numbers of transducers. Due to the impact load on a composite laminate, matrix cracks can develop and the degradation in the material stiffness develops in the transverse direction with reference to the fiber orientation. Progressive matrix cracking further coalesces and initiate delamination. Ultrasonic guided wave propagation in a laminated composite with matrix crack is studied using numerical simulation. For fast simulation, a time domain spectral finite element (TSFE) scheme is developed, where a higher-order spectral family of interpolation functions is employed to model the wave propagation in a laminated composite. Development of matrix cracks without and with delamination at the adjacent interface is modeled and the sensitivity of the ultrasonic wave is determined from the simulated sensor signal obtained due to scattering from the damage region. Power spectral density of the signal is represented statistically to develop further insight to the problem of estimating the damage severity. Confirming delamination initiation with received signal in the laminate composite structures is of great interest. The nature of uncertainty in the received signal due to variation in the matrix crack regions is studied using statistical approach


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