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Crack arrest in Si
3
N
4
-based layered composites with residual stress
M. Lugovy
a
, V. Slyunyayev
a
, V. Subbotin
a
, N. Orlovskaya
a
, G. Gogotsi
b
a
Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhizhanovsky Str., Kiev 03142, Ukraine
b
Institute for Problems of Strength, National Academy of Sciences of Ukraine, 2 Timiryazevskaya str., Kiev 01014, Ukraine
Received 28 May 2003; received in revised form 17 February 2004; accepted 19 February 2004
Available online 12 April 2004
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COMPOSITES
SCIENCE AND
TECHNOLOGY
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Abstract
Effect of macroscopic residual stresses on fracture resistance and crack arrest in non-symmetric Si
3
N
4
/Si
3
N
4
–
x
TiN (
x
= 20, 30 wt%) layered specimens was investigated in this study. One of the aims of the work was also an examination of compliance technique to study
R
-curve effect as applied to layered specimens. A special attention was paid to the development of an analytical method to calculate fracture resistance – crack length dependence in layered structures having different elastic moduli of layers. The validity of the method and its application were examined by calculating stress intensity coefficients for edge-cracked layered specimens and comparison of the results with mechanical characteristics obtained from bending test.
© 2004 Elsevier Ltd. All rights reserved.
Keywords: A. Layered structures; B. Fracture toughness; Modelling; C. Crack; Residual stress
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