Paper Title:
Modelling of Crack Bifurcation in Laminar Ceramics with Large Compressive Stress
  Abstract

Ceramic laminates designed with strong interfaces have shown crack growth resistance (R-curve) behaviour through microstructural design (e.g. grain size, layer composition) and/or due to the presence of compressive residual stresses, acting as a barrier to crack propagation. The goal of the contribution is to model the mechanism of crack bifurcation in laminar ceramics with large compressive stress which still have not been satisfactory explained. Experimental observations of the crack path in the multilayered ceramics tested under several kinds of loading showed crack penetration (i.e. crack propagating normal to the layers followed by crack bifurcation when the crack propagated from the tensile to the compressive layer. Numerical results [1] show that the initiation of crack bifurcation can be explained by the near-tip J-integral, provided that micro-cracks exist near the crack tip. We revisit the problem using the concept of Finite fracture mechanics and the matched asymptotic expansion method in order to evaluate the energy release rate criteria describing the competition of the crack bifurcation and straight crack propagation near behind the bimaterial interface.

  Info
Periodical
Key Engineering Materials (Volumes 488-489)
Edited by
Z. Tonković and M.H. Aliabadi
Pages
130-133
DOI
10.4028/www.scientific.net/KEM.488-489.130
Citation
M. Kotoul, O. Ševeček, T. Profant, "Modelling of Crack Bifurcation in Laminar Ceramics with Large Compressive Stress", Key Engineering Materials, Vols. 488-489, pp. 130-133, 2012
Online since
September 2011
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Price
$32.00
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