Title

Mechanical behavior and failure mechanisms of boron carbide based three-layered laminates with weak interfaces

Authors

Authors

M. Lugovy; V. Slyunyayev; V. Subbotin; F. Liang; J. H. Gou; N. Orlovskaya; T. Graule;J. Kuebler

Comments

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Abbreviated Journal Title

Ceram. Int.

Keywords

Laminate; Ceramics; Fracture toughness; Residual stress; STRESS INTENSITY FACTOR; FRACTURE-TOUGHNESS; CERAMIC COMPOSITES; RESISTANCE; DESIGN; Materials Science, Ceramics

Abstract

The effect of weak interfaces on failure mechanisms of a three-layered composite was studied. Three-layered B(4)C/B(4)C-C(nanofibers) laminates have been produced using a hot pressing technique. The laminates were designed with thick (similar to 2.6 mm) outer layers of B(4)C and a thin (similar to 90 mu m) center layer of B(4)C-70 wt.% C(nanofibers). Based on the difference in coefficients of thermal expansion and Young's moduli of the pure B(4)C and B(4)C-70 wt.% C(nanofibers) layers, it was estimated that low tensile thermal residual stress with a magnitude of 11.3 +/- 2.5 MPa was developed in the thick B(4)C outer layers, and compressive residual stress with a magnitude of 455.7 +/- 5 MPa was developed in the thin central B(4)C-70 wt.% C(nanofibers) layer. The apparent fracture toughness of laminates was measured and based on the estimated fracture toughness values, a threshold stress was calculated. (C) 2011 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Journal Title

Ceramics International

Volume

37

Issue/Number

7

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

2255

Last Page

2261

WOS Identifier

WOS:000293759300028

ISSN

0272-8842

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