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

    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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