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Strength and toughness in shear of constrained layers
University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Engineering Science. (Materialmekanik, Mechanics of Materials)ORCID iD: 0000-0001-8335-0855
University of Skövde, The Virtual Systems Research Centre. University of Skövde, School of Engineering Science. (Materialmekanik, Mechanics of Materials)ORCID iD: 0000-0003-0787-4942
2018 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 138, p. 50-63Article in journal (Refereed) Published
Abstract [en]

Confined layers may fracture in shear. This occurs, for example in adhesive joints and composite materials. A common mechanism for shear fracture is the formation of shear hackles associated with an expansion of the layer. This makes shear toughness and strength depend on the constraint of the expansion. By constraining the expansion using external loading in experiments, the expansion is reduced but not totally inhibited. The experiments are evaluated using the path independent properties of the J-integral. It is shown that the shear toughness increases for the more constrained case. Thus, from a strength analysis perspective, ignoring the expansion leads to a conservative estimate of the fracture properties. Extrapolation of the evaluated properties to totally inhibited expansions gives the traction separation relation and the fracture toughness for a layer in simple shear.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 138, p. 50-63
Keyword [en]
Adhesive, Cohesive law, Cohesive layer, Constrain, Dilatation, Mode II, Shear fracture, Shear hackles, Simple shear
National Category
Applied Mechanics
Research subject
Mechanics of Materials
Identifiers
URN: urn:nbn:se:his:diva-14973DOI: 10.1016/j.ijsolstr.2017.12.028OAI: oai:DiVA.org:his-14973DiVA, id: diva2:1191657
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-04-06

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Biel, AndersStigh, Ulf

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