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Constitutive behaviour of mixed mode loaded adhesive layer
University of Skövde, School of Technology and Society.
Tech Univ Denmark, Mat Res Dept, Riso Natl Lab, DK-4000 Roskilde, Denmark.
University of Skövde, School of Technology and Society.
2007 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 44, no 25-26, 8335-8354 p.Article in journal (Refereed) Published
Abstract [en]

Mixed mode testing of adhesive layer is performed with the Mixed mode double Cantilever Beam specimen. During the experiments, the specimens are loaded by transversal and/or shear forces; seven different mode mixities are tested. The J-integral is used to evaluate the energy dissipation in the failure process zone. The constitutive behaviour of the adhesive layer is obtained by a so called inverse method and fitting an existing mixed mode cohesive model, which uses a coupled formulation to describe a mode dependent constitutive behaviour. The cohesive parameters are determined by optimizing the parameters of the cohesive model to the experimental data. A comparison is made with the results of two fitting procedures. It is concluded that the constitutive properties are coupled, i.e. the peel and shear stress depend on both the peel and shear deformations. Moreover, the experiments show that the critical deformation in the peel direction is virtually independent of the mode mixity.

Place, publisher, year, edition, pages
Elsevier, 2007. Vol. 44, no 25-26, 8335-8354 p.
Keyword [en]
Adhesive layer, Mixed mode testing, J-integral, Constitutive behaviour, Cohesive law, Inverse method
National Category
Condensed Matter Physics
Research subject
Technology
Identifiers
URN: urn:nbn:se:his:diva-2529DOI: 10.1016/j.ijsolstr.2007.06.014ISI: 000251775400016Scopus ID: 2-s2.0-35448969787OAI: oai:DiVA.org:his-2529DiVA: diva2:134071
Available from: 2009-01-16 Created: 2009-01-16 Last updated: 2013-04-11Bibliographically approved
In thesis
1. Mixed mode loaded adhesive layers: from measurement of material data to analysis of structural behaviour
Open this publication in new window or tab >>Mixed mode loaded adhesive layers: from measurement of material data to analysis of structural behaviour
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In manufacturing of multi-material products, a joining method that is able to cost-effectively assemble components made of dissimilar and similar material, with irregular geometries, is optimal. As an alternative, adhesive bonding is in-creasingly adapted by the industry, which is also used in manufacturing of multi-phase materials. In practice, adhesives are constrained to thin layers. An adhesive as a constrained layer behaves differently compared to the adhesive as a bulk material. In general, adhesive layers are loaded in peel (mode I), or in shear (mode II or III), or in a combination of peel and shear (mixed mode). This thesis deals with mixed mode loaded adhesive layers, from measurement of ma-terial data to analysis of structural behaviour. For studying of structural behaviour of adhesive joints, an integrated approach is developed. Arbitrarily end-loaded single-layer adhesive joints with arbitrary ad-herends of arbitrary length are analysed with the Beam/Adhesive layer (B/A) model. Closed-form solutions are obtained for the adhesive layer as well as for the adherends. For joints with a semi-infinite symmetric geometry, i.e. relative long joints with identical adherends loaded at one end, basic loading cases are obtained. Solutions to these basic loading cases are easy to use in designing of joints with this type of geometry. For nonlinear or general adhesive layers, a mode-dependent cohesive law is de-veloped. The normalized formulation is easy to implement in numerical simula-tions, yet, it captures the characteristics of adhesive layers. For experimental studies, this cohesive law is used to obtain the constitutive behaviour of an adhe-sive layer. The results confirm the ability and suitability of this cohesive law in modelling of adhesive layers. To obtain material data of adhesive layers, experimental methods are developed based on the J-integral. Two specimens, the Mixed mode double Cantilever Beams (MCB) specimen and the Unbalanced Double Cantilever Beams (UDCB) specimen, are designed to allow adhesive layers to be loaded in mixed mode. The MCB-specimen is implemented experimentally and the constitutive behav-iour of the tested adhesive layer is obtained.

Place, publisher, year, edition, pages
Chalmers tekniska högskola, 2007. 17 p.
Series
Doktorsavhandlingar vid Chalmers tekniska högskola, ISSN 0346-718X ; 2572
Keyword
adhesive layer, mixed mode testing, cohesive law, J-integral
National Category
Mechanical Engineering
Research subject
Technology
Identifiers
urn:nbn:se:his:diva-2039 (URN)978-91-7291-891-7 (ISBN)
Public defence
(English)
Available from: 2008-05-09 Created: 2008-05-09 Last updated: 2013-03-26

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