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Stability of beam-like fracture mechanics specimens
University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society. (Materialmekanik)
University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Technology and Society. (Materialmekanik)
2012 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 89, 98-113 p.Article in journal (Refereed) Published
Abstract [en]

Test specimens used to determine the interlaminar strength of composites as well as the strength of adhesive layers are known to occasionally suffer from instability. Thus, even though the experiments are performed under controlled load-point displacement, the experiments are terminated prematurely by unstable crack propagation. Often there exists a critical crack length which must be exceeded in order to obtain stable crack propagation. In this paper, a general method to assess the stability of beam-like fracture mechanics specimens is developed. Both systems subjected to a single load and the more general situation with several independent loads are treated. A simple formula is derived for the critical crack length for one-parameter loading. The only parameter necessary as input is the compliance of the un-cracked specimen. For the case of non-proportional loading, stability is determined by studying the eigenvalues of a symmetric matrix. Other findings quantified in the paper are the effect of orthotropy, the influence of a flexible interphase layer and the influence of the compliance of the loading device.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 89, 98-113 p.
Keyword [en]
Stable crack growth, Unstable crack growth, J-integral, Delamination, Mixed mode fracture, Toughness testing
National Category
Mechanical Engineering
Research subject
Technology
Identifiers
URN: urn:nbn:se:his:diva-6437DOI: 10.1016/j.engfracmech.2012.04.027ISI: 000306535200008Scopus ID: 2-s2.0-84862122861OAI: oai:DiVA.org:his-6437DiVA: diva2:559991
Available from: 2012-10-11 Created: 2012-10-04 Last updated: 2016-01-08Bibliographically approved

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Alfredsson, K. SvanteStigh, Ulf
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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
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  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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  • asciidoc
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