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Unbalanced UCB-specimen
University of Skövde, School of Technology and Society.
2006 (English)In: CDCM06 online proceedings, University of Stuttgart , 2006Conference paper, (Refereed)
Abstract [en]

The Double Cantilever Beam (DCB) specimen is a common test geometry for testing of mode I fracture properties of adhesive joints. However, when unbalances are introduced to the adherends, the adhesive layer is loaded in a combination of peel (mode I) and shear (mode II). In this work the unbalanced DCB-specimen is studied by the use of the beam/adhesive layer (B/A) model, in which the adherends are considered as beams and the adhesive layer as a generalised spring media. The effect of the thickness of adhesive layer together with the effect of the geometrical and material unbalances is analysed. The result of the B/A model is compared to the continuum model through FE-simulations. Finally, an unsymmetric DCB-specimen is dimensioned for mixed mode testing of adhesive layer.

Place, publisher, year, edition, pages
University of Stuttgart , 2006.
Keyword [en]
adhesive layer; mixed mode testing, Double Cantilever Beam specimen
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:his:diva-2545ISBN: 3-930683-90-3 OAI: oai:DiVA.org:his-2545DiVA: diva2:134249
Available from: 2009-01-19 Created: 2009-01-19 Last updated: 2013-03-20
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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