Mukhopadhyay, Anoop Kumar and Joshi, Keshaw D and Dey, Arjun and Chakraborty, Riya and Rav, Amit and Biswas, Sampad Kumar and Gupta, Satish C (2010) Shock deformation of coarse grain alumina above Hugoniot elastic limit. Journal of Materials Science, 45 (13). pp. 3635-3651. ISSN 0022-2461

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Abstract

Symmetric shock experiments were conducted on a 10 mu m grain size coarse alumina ceramic with a gas gun to identify its Hugoniot elastic limit (HEL). To understand the damage initiation and their subsequent growth mechanisms in coarse grain alumina subjected to shock impact at levels much above the HEL, additional asymmetric shock recovery experiments with the same gas gun were then deliberately conducted on the same alumina at shock pressure levels more than three times as high as the HEL and the fragments collected by a dedicated catcher system. Detailed characterization of the shock recovered alumina fragments by X-ray diffraction, nanoindentation, scanning electron microscopy, field emission scanning electron microscopy and transmission electron microscopy were utilized to understand the nature and process of failure initiation, incubational growth, coalescence and propagation leading to fragmentation. Based on these data a new qualitative damage model was developed to explain the deformation mechanism.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Bidhan Chaudhuri
Date Deposited:	14 Feb 2012 12:40
Last Modified:	14 Feb 2012 12:40
URI:	http://cgcri.csircentral.net/id/eprint/817

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