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Studies of fracture in shear of a constrained layer
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik, Mechanics of Materials)ORCID iD: 0000-0003-0787-4942
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik, Mechanics of Materials)ORCID iD: 0000-0001-8335-0855
2017 (English)In: Advanced Problems in Mechanics: Proceedings of the XLV Summer School Conference / [ed] Dmitri A. Indeitsev and Anton M. Krivtsov, St Petersburg: Institute for Problems in Mechanical Engineering RAS , 2017, 420-428 p.Conference paper, (Refereed)
Abstract [en]

Cracks normally propagate in the opening mode associated with a state of local symmetry at a crack tip. However, the micro- or macrostructure of a material or structure sometimes forces cracks to propagate in a shearing mode. Irrespective of the actual material studied, fracture in shear is frequently asso- ciated with the formation of a large number smaller sigmoidal-shaped cracks in the propagation direction of the major crack. Propagation of the major shear crack is accomplished by coalescing the sigmoidal-shaped cracks. Ex- periments show that the formation of sigmoidal cracks due to shear loading leads to a normal separation of the joined substrates. Theoretical studies show that constraining the local opening of the sigmoidal cracks increases the frac- ture resistance for the propagation of the major crack. In the present study, experiments with a ductile adhesive loaded in shear and where the normal sep- aration is constrained are presented. The experiments are evaluated using the path independent J-integral. The associated cohesive law shows that consid- erable normal compressive stress develops in the adhesive during macroscopic shear loading. It is also concluded that by ignoring the normal separation in the evaluation of the experiments, the strength of the adhesive is underesti- mated. Thus, the procedure developed in earlier studies is conservative from a strength analysis perspective. The present technique might be possible to extend to other materials to reveal their properties in shear fracture.

Place, publisher, year, edition, pages
St Petersburg: Institute for Problems in Mechanical Engineering RAS , 2017. 420-428 p.
Series
Advanced problems in mechanics (Online)/Proceedings of the International Summer school-conference "Advanced problems in mechanics", ISSN 2312-9921
National Category
Applied Mechanics
Research subject
Mechanics of Materials
Identifiers
URN: urn:nbn:se:his:diva-13852OAI: oai:DiVA.org:his-13852DiVA: diva2:1114530
Conference
Advanced Problems in Mechanics, St Petersburg, Russia, June 22-27, 2017
Note

Just nu finns inte proceedings på hemsidan (förra årets proceedings verkar ha publicerats i oktober). Proceedings skall kunna hittas här (se högra delen av sidan): http://apm-conf.spb.ru 

Available from: 2017-06-24 Created: 2017-06-24 Last updated: 2017-08-15

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