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Mode II crack paths under compression in brittle solids - a theory and experimental comparison

Isaksson, P. and Ståhle, P. LU (2002) In International Journal of Solids and Structures 39(8). p.2281-2297
Abstract
A study of crack propagation paths in the situation where the crack is suppressed to open during growth due to high compressive forces has been performed. This problem was analyzed theoretically very recently by the authors and is here extended to involve a limited number of illustrative experimental results reported elsewhere in the literature. By analyzing the experimental crack growth patterns, the conclusion is that the model cannot describe the more realistic microscopic failure in detail. Since shear crack growth on the microscale strongly depend on inhomogenities in the material, like cavities, grains or inclusions; the closed crack growth patterns observed are not smooth or free of kinks. Nevertheless, the model show good agreement... (More)
A study of crack propagation paths in the situation where the crack is suppressed to open during growth due to high compressive forces has been performed. This problem was analyzed theoretically very recently by the authors and is here extended to involve a limited number of illustrative experimental results reported elsewhere in the literature. By analyzing the experimental crack growth patterns, the conclusion is that the model cannot describe the more realistic microscopic failure in detail. Since shear crack growth on the microscale strongly depend on inhomogenities in the material, like cavities, grains or inclusions; the closed crack growth patterns observed are not smooth or free of kinks. Nevertheless, the model show good agreement with the reported experimental observations of the paths of closed macroscopic mode II cracks on samples in brittle materials, induced under overall compression.

Failure patterns experimentally observed supports the theory that the growth of mode II cracks under compression in brittle materials follow a propagation path described by a function y=λxb, where b=3/2. This is strongly supported by the measured values obtained from various experiments. In all the studied experiments, the exponent b was found in the interval [1.43–1.58]. Further, an investigation of the curvature parameter λ has been performed and the conclusion is that λ does also agree with the simplified model, even though not as good as the exponent b. However, λ differs in general <15% from the theoretical value predicted by the model. The process of crack growth is in the simplified model assumed to be controlled by the mode II stress intensity factor KII of the main crack and the difference between the compressive remote normal stress parallel with the crack plane (σ11∞) and the compressive remote normal stress perpendicular to the crack plane (σ22∞). (Less)
Abstract (Swedish)
A study of crack propagation paths in the situation where the crack is suppressed to open during growth due to high compressive forces has been performed. This problem was analyzed theoretically very recently by the authors and is here extended to involve a limited number of illustrative experimental results reported elsewhere in the literature. By analyzing the experimental crack growth patterns, the conclusion is that the model cannot describe the more realistic microscopic failure in detail. Since shear crack growth on the microscale strongly depend on inhomogenities in the material, like cavities, grains or inclusions; the closed crack growth patterns observed are not smooth or free of kinks. Nevertheless, the model show good agreement... (More)
A study of crack propagation paths in the situation where the crack is suppressed to open during growth due to high compressive forces has been performed. This problem was analyzed theoretically very recently by the authors and is here extended to involve a limited number of illustrative experimental results reported elsewhere in the literature. By analyzing the experimental crack growth patterns, the conclusion is that the model cannot describe the more realistic microscopic failure in detail. Since shear crack growth on the microscale strongly depend on inhomogenities in the material, like cavities, grains or inclusions; the closed crack growth patterns observed are not smooth or free of kinks. Nevertheless, the model show good agreement with the reported experimental observations of the paths of closed macroscopic mode II cracks on samples in brittle materials, induced under overall compression. Failure patterns experimentally observed supports the theory that the growth of mode II cracks under compression in brittle materials follow a propagation path described by a function y = lambdax(b), where b = 3/2. This is strongly supported by the measured values obtained from various experiments. In all the studied experiments, the exponent b was found in the interval [1.43-1.58]. Further, an investigation of the curvature parameter has been performed and the conclusion is that does also agree with the simplified model, even though not as good as the exponent b. However, lambda differs in general <15% from the theoretical value predicted by the model. The process of crack growth is in the simplified model assumed to be controlled by the mode 11 stress intensity factor K-II of the main crack and the difference between the compressive remote normal stress parallel with the crack plane (sigma(11)(infinity)) and the compressive remote normal stress perpendicular to the crack plane (sigma(22)(infinity)). (C) 2002 Elsevier Science Ltd. All rights reserved. (Less)
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author
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Crack growth, Mode 2, Brittle Material, Compressive stresses, Frictionless contact
in
International Journal of Solids and Structures
volume
39
issue
8
pages
17 pages
publisher
Elsevier
external identifiers
  • wos:000175669900011
  • scopus:0037066651
ISSN
0020-7683
DOI
10.1016/s0020-7683(02)00089-6
language
English
LU publication?
no
additional info
Isaksson, P Stahle, P Stahle, Per/J-3590-2014
id
5a91bcee-0987-4f40-99e6-2310b6899281
date added to LUP
2019-06-25 19:08:04
date last changed
2022-04-02 19:38:51
@article{5a91bcee-0987-4f40-99e6-2310b6899281,
  abstract     = {{A study of crack propagation paths in the situation where the crack is suppressed to open during growth due to high compressive forces has been performed. This problem was analyzed theoretically very recently by the authors and is here extended to involve a limited number of illustrative experimental results reported elsewhere in the literature. By analyzing the experimental crack growth patterns, the conclusion is that the model cannot describe the more realistic microscopic failure in detail. Since shear crack growth on the microscale strongly depend on inhomogenities in the material, like cavities, grains or inclusions; the closed crack growth patterns observed are not smooth or free of kinks. Nevertheless, the model show good agreement with the reported experimental observations of the paths of closed macroscopic mode II cracks on samples in brittle materials, induced under overall compression.<br>
<br>
Failure patterns experimentally observed supports the theory that the growth of mode II cracks under compression in brittle materials follow a propagation path described by a function y=λxb, where b=3/2. This is strongly supported by the measured values obtained from various experiments. In all the studied experiments, the exponent b was found in the interval [1.43–1.58]. Further, an investigation of the curvature parameter λ has been performed and the conclusion is that λ does also agree with the simplified model, even though not as good as the exponent b. However, λ differs in general &lt;15% from the theoretical value predicted by the model. The process of crack growth is in the simplified model assumed to be controlled by the mode II stress intensity factor KII of the main crack and the difference between the compressive remote normal stress parallel with the crack plane (σ11∞) and the compressive remote normal stress perpendicular to the crack plane (σ22∞).}},
  author       = {{Isaksson, P. and Ståhle, P.}},
  issn         = {{0020-7683}},
  keywords     = {{Crack growth; Mode 2; Brittle Material; Compressive stresses; Frictionless contact}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{2281--2297}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Solids and Structures}},
  title        = {{Mode II crack paths under compression in brittle solids - a theory and experimental comparison}},
  url          = {{http://dx.doi.org/10.1016/s0020-7683(02)00089-6}},
  doi          = {{10.1016/s0020-7683(02)00089-6}},
  volume       = {{39}},
  year         = {{2002}},
}