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Ultrasonic evaluation of delamination in quasi-isotropic CFRP laminates subjected to low-velocity impact

Hosur, MV and Murthy, CRL (1996) Ultrasonic evaluation of delamination in quasi-isotropic CFRP laminates subjected to low-velocity impact. In: 14th World Conference on NDT - Trends in NDE Science and Technology (14th WCNDT), Dec 08-13, 1996, New Delhi, India.

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Abstract

Ultrasonic C-Scan is used very often to detect flaws and defects in the composite components resulted during fabrication and damages resulting from service conditions. Evaluation and characterization of defects and damages of composites require experience and good understanding of the material as they are distinctly different in composition and behavior as compared to conventional metallic materials. The failure mechanisms in composite materials are quite complex. They involve the interaction of matrix cracking, fiber matrix interface debonding, fiber pullout, fiber fracture and delamination. Generally all of them occur making the stress and failure analysis very complex. Under low-velocity impact loading delamination is observed to be a major failure mode. In composite materials the ultrasonic waves suffer high acoustic attenuation and scattering effect, thus making data interpretation difficult. However these difficulties can be overcome to a greater extent by proper selection of probe, probe parameter settings like pulse width, pulse amplitude, pulse repetition rate, delay, blanking, gain etc., and data processing which includes image processing done on the image obtained by the C-Scan.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to A A Balkema.
Department/Centre: Others
Date Deposited: 15 Mar 2012 09:16
Last Modified: 15 Mar 2012 09:16
URI: http://eprints.iisc.ernet.in/id/eprint/43957

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