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Fatigue damage of adhesive layers: experiments and models
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik)ORCID iD: 0000-0003-0309-3073
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik)
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik)
University of Skövde, School of Engineering Science. University of Skövde, The Virtual Systems Research Centre. (Materialmekanik)ORCID iD: 0000-0003-0787-4942
2014 (English)In: Procedia Materials Science, ISSN 2211-8128, Vol. 3, 829-834 p.Article in journal (Refereed) Published
Abstract [en]

Mode I fatigue crack growth at load levels close to the threshold is studied with the aim of improving the understanding of the fatigue properties. We also aim at identifying a suitable damage evolution law for large-scale simulation of built-up structures. A fatigue test rig is designed where up to six specimens are tested simultaneously. Each specimen is evaluated separately indicating the specimen-to-specimen variation in fatigue properties. A rubber-based and a PUR-based adhesive are tested. The two adhesives represent adhesives with very different material properties; the rubber adhesive is a stiff structural adhesive and the PUR adhesive is a soft modular adhesive. The experiments are first evaluated using a traditional Paris’ law approach. Inspired by an existing damage evolution law, a modified damage evolution law is developed based on only three parameters. The law is implemented as a user material in Abaqus and the parameters are identified. The results from simulations show a very good ability to reproduce the experimental data. With this model of fatigue damage, a zone of damage evolves at the crack tip. The extension of this zone depends on the stiffness of the adherends; stiffer adherends leads to a larger damage zone. This means that the rate of crack growth depends on the stiffness of the adherends. Thus, not only the state at the crack tip governs the rate of crack growth. This is in contrast to the results of a model based on Paris’ law where only the state at the crack tip, through the energy release rate, governs the rate of crack growth. This indicates that the threshold value of the energy release rate may depend on the stiffness of the adherends.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 3, 829-834 p.
National Category
Applied Mechanics
Research subject
Technology
Identifiers
URN: urn:nbn:se:his:diva-9603DOI: 10.1016/j.mspro.2014.06.135OAI: oai:DiVA.org:his-9603DiVA: diva2:730313
Conference
20th European Conference on Fracture (ECF20)
Projects
ULFS
Funder
Knowledge Foundation
Available from: 2014-06-27 Created: 2014-06-27 Last updated: 2016-04-27Bibliographically approved
In thesis
1. Influences of temperature, fatigue and mixed mode loading on the cohesive properties of adhesive layers
Open this publication in new window or tab >>Influences of temperature, fatigue and mixed mode loading on the cohesive properties of adhesive layers
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis concerns some aspects that have influence on the strength of adhesive layers. The strength is determined by the stress deformation-relation of the layer. This relation is also referred to as cohesive law. The aspects having influence on the cohesive laws that are studied in this work are temperature, fatigue, multi-axial fatigue and mixed mode loading.

For each aspect, a model is developed that can be used to describe the influence of the aspects on the cohesive laws numerically, e.g. by using the finite element method. These models are shown to give good agreement with the experimental results when performing simulations that aims at reproducing the experiments. For the aspect of temperature, a FE-model is suggested that can be used to simulate the mechanical behaviour in pure mode loadings at any temperature within the evaluated temperature span. Also, a damage law for modelling high cycle fatigue in a bonded structure in multi-axial loading is presented. Lastly, a new experimental set-up is presented for evaluating strength of adhesives during mixed mode loading. The set-up enables loading with a constant mode-mix ratio and by the experimental results, a potential model for describing the mechanical behaviour of the evaluated adhesive is presented.

Place, publisher, year, edition, pages
Göteborg: Chalmers Publication Library, 2015. 33 p.
Series
Doktorsavhandlingar vid Chalmers tekniska högskola, ISSN 0346-718X ; 3866
Keyword
adhesive layer, cohesive law, fatigue, finite element analysis, fracture energy, mixed mode, multi-axial fatigue, potential model, temperature
National Category
Applied Mechanics
Identifiers
urn:nbn:se:his:diva-10972 (URN)978-91-7597-185-8 (ISBN)
Public defence
2015-06-08, 10:00 (English)
Opponent
Available from: 2015-05-29 Created: 2015-05-28 Last updated: 2016-01-12Bibliographically approved

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Walander, TomasEklind, AlexanderCarlberger, ThomasStigh, Ulf
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