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Stability of beam-like fracture mechanics specimens
Högskolan i Skövde, Forskningscentrum för Virtuella system. Högskolan i Skövde, Institutionen för teknik och samhälle. (Materialmekanik)
Högskolan i Skövde, Forskningscentrum för Virtuella system. Högskolan i Skövde, Institutionen för teknik och samhälle. (Materialmekanik)
2012 (engelsk)Inngår i: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 89, s. 98-113Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2012. Vol. 89, s. 98-113
Emneord [en]
Stable crack growth, Unstable crack growth, J-integral, Delamination, Mixed mode fracture, Toughness testing
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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, id: diva2:559991
Tilgjengelig fra: 2012-10-11 Laget: 2012-10-04 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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Alfredsson, K. SvanteStigh, Ulf

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