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Specimen proposals for mixed mode testing of adhesive layer
University of Skövde, School of Technology and Society.
University of Skövde, School of Technology and Society.
2006 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 73, no 16, 2541-2556 p.Article in journal (Refereed) Published
Abstract [en]

The experimental methods to determine the fracture properties for adhesives under mixed mode loading is not as well established as compared to such methods for adhesives under pure mode loading. Some controversies exist regarding the decomposition of the mode mixity. For a flexible linear elastic adhesive, the mode mixity of a single-layer adhesive joint is directly related to the deformation of the adhesive layer at the crack tip. The governing equations for linear elastic single-layer adhesive joints show that the mode mixity depends on the external loads, the properties of the adherends and often on the flexibility of the adhesive layer. This implies some fundamental problems that have to be addressed before an experimental method can be established. The purpose of this paper is to investigate different specimen configurations for mixed mode loading. Requirements for the design of a specimen configuration are given. A new specimen configuration is proposed based on the geometry of a semi-infinite symmetric DCB-specimen. According to this study, the proposed test specimen offers exceptional flexibility, variety and stability.

Place, publisher, year, edition, pages
Elsevier, 2006. Vol. 73, no 16, 2541-2556 p.
National Category
Engineering and Technology
Research subject
Technology
Identifiers
URN: urn:nbn:se:his:diva-1900DOI: 10.1016/j.engfracmech.2006.04.017ISI: 000240837000023Scopus ID: 2-s2.0-33747202424OAI: oai:DiVA.org:his-1900DiVA: diva2:32176
Available from: 2008-01-09 Created: 2008-01-09 Last updated: 2013-04-10Bibliographically 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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