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Analysis of microresidual stresses in 6H-SiC particles within $Al_2O_3-SiC-(Al,Si)$ CMC using raman spectroscopy

Singh, Arvind R and Sood, AK and Jayaram, V and Biswas, SK (1998) Analysis of microresidual stresses in 6H-SiC particles within $Al_2O_3-SiC-(Al,Si)$ CMC using raman spectroscopy. In: Scripta Materialia, 38 (4). pp. 617-622.

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Abstract

Residual stresses can be generated in composites under two conditions (1): (a) processing of the composite can lead to ‘microresidual stress’ and (b) machining operations, like grinding can lead to ‘macroresidual stress’ (2). The genesis of microresidual stress is the mismatch in the thermal expansion coefficient between the matrix and the reinforcing phase. The term ‘microresidual stress’ is used to denote stress which varies in magnitude over dimensions that are of the order of the microstructural scale. ‘Macrostresses’ generally arise near the composite surface because of the differences in processing between the surface and the bulk. Both these stresses are well known to affect the structure and the behaviour of composites (3,4). The influence of these stresses on the properties of composites may result in strong positive or negative effects depending upon their sign and magnitude. For example, local radial tension in the matrix near a particle-matrix interface can lead to crack deflection (5). Hence, information on the sign and magnitude of the residual stress help to tailor the structure and properties of the material for better performance.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Division of Mechanical Sciences > Mechanical Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 04 Dec 2006
Last Modified: 19 Sep 2010 04:32
URI: http://eprints.iisc.ernet.in/id/eprint/9014

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