Mode II crack paths under compression in brittle solids: A theory and experimental comparison

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Isaksson, PerMittuniversitetet,Institutionen för teknik, fysik och matematik (-2008),FSCN – Fibre Science and Communication Network (author)

Mode II crack paths under compression in brittle solids : A theory and experimental comparison

Article/chapterEnglish2002

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2002
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LIBRIS-ID:oai:DiVA.org:miun-1121
https://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-1121URI
https://doi.org/10.1016/S0020-7683(02)00089-6DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-2632URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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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 ¼ kxb, where b ¼ 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 k has been performed and the conclusion is that k does also agree with the simplified model, even though not as good as the exponent b. However, k 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 (r111) and the compressive remote normal stress perpendicular to the crack plane (r122).

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Materialteknik Pappers-, massa- och fiberteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Paper, Pulp and Fiber Technology hsv//eng
TEKNIK OCH TEKNOLOGIER Maskinteknik Teknisk mekanik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Applied Mechanics hsv//eng
Fracture mechanics
Cellulose and paper engineering
Cellulosa- och pappersteknik

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Ståhle, PerMalmö högskola,Teknik och samhälle (TS)(Swepub:mau)tspest (author)
MittuniversitetetInstitutionen för teknik, fysik och matematik (-2008) (creator_code:org_t)

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In:International Journal of Solids and Structures39:8, s. 2281-22970020-76831879-2146

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Paper Pulp and F ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Applied Mechanic ...

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By the university: Mid Sweden University; Malmö University

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