Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 68, Issue 1, Pages 209-214Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2007.04.020
Keywords
layered structures; contact strength; finite element analysis (FEA); residual stresses
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Ceramic laminates with residual stress arising from thermal mismatch, show higher strength and larger apparent fracture toughness than their monolithic counterparts. For an effective improvement under in-service conditions, such enhancement should be reflected on the blunt-contact behaviour, characterized by an inhomogeneous multiaxial stress state. The contact strength test is an interesting alternative to traditional testing methods to evaluate contact-focused resistance of brittle materials. Because of the Hertzian-like stress state, high stresses can be generated far from the surface, producing failure from the weakest part of the structure, and this is especially true in pre-stressed materials, such as the one herein studied. In this work, experimental tests on a laminated ceramic are reported together with a FE analysis, showing a noteworthy improvement, although in some cases the composite structure may fail in an inner layer, and providing general tools for designing contact-resistant structures. (c) 2007 Elsevier Ltd. All rights reserved.
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