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Micro and macroscopic features of impact failed defect induced carbon-epoxy composites

Kishore, * and Khan, B (1999) Micro and macroscopic features of impact failed defect induced carbon-epoxy composites. In: Praktische Metallographie / Practical Metallography, 36 (9). pp. 487-494.

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Laminated composite structures are susceptible to damage under impacts with attendant properly degradation. While studies on damage tolerance behaviour are emphasised and the findings reported, the citations correlating impacts with the fracture features are limited. In the present study, therefore, attempts have been made to depict how the transition of the fracture features take place depending on the type and extent of defect introduced onto the carbon-epoxy system. The test specimens were subjected to differing levels of low energy pendulum impacts with a view to have specimens with varying levels of intial impacts history. Into such specimens, additional defect in the form of slits of varying depths were introduced by a mechanical process. The test coupons were then allowed to fail by impact. The fracture surface was studied under scanning electron microscope. The fractographic features that appear, based on the induced/inserted defects, are presented in this paper. It was noticed that the energy absorbed for final fracture could be associated with the defect introduced into the system. It was also observed that the size of the mechanically inserted defect had a significant influence on the features of the fracture surface.

Item Type: Journal Article
Publication: Praktische Metallographie / Practical Metallography
Publisher: Carl Hanser Verlag
Additional Information: Copyright of this article belongs to Carl Hanser Verlag.
Keywords: Laminate;Epoxy resin;Carbon fiber;Defect;Notched test piece; Mechanical shock;Repeated charge;Fracture surface;Rupture; Mechanism;Experimental study;
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 30 Jun 2011 11:36
Last Modified: 30 Jun 2011 11:36
URI: http://eprints.iisc.ac.in/id/eprint/38659

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