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

MUNIAN, RAJENDRA KUMAR and MAHAPATRA, D ROY and GOPALAKRISHNAN, S (2017) Delamination Detection in Laminated Composite with Uncertainty Due to Material Degradation in Damaged Region. In: 11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017, 12 - 14 September 2017, Stanford.

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Abstract

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.

Item Type:	Conference Paper
Publisher:	DEStech Publications
Additional Information:	The Copyright of this article belongs to the DEStech Publications.
Keywords:	Cracks; Guided electromagnetic wave propagation; Laminating; Safety engineering; Spectral density; Stiffness matrix; Structural health monitoring; Ultrasonic applications; Ultrasonic waves; Delamination detections; Delamination initiation; Interpolation function; Laminate composite structures; Long-range propagation; Spectral finite elements; Statistical approach; Ultrasonic guided wave; Laminated composites
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	17 Jun 2022 07:40
Last Modified:	17 Jun 2022 09:19
URI:	https://eprints.iisc.ac.in/id/eprint/73520

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