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Mixed mode modeling of a thin adhesive layer using a meso-mechanical model
2008 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 40, no 8, 665-672 p.Article in journal (Refereed) Published
Abstract [en]

A representative volume element is modeled using the finite element method. It is used to analyze mixed mode behavior of a thin adhesive layer. Two sources of dissipation is modeled; plasticity and decohesion. Macroscopic traction–separation laws are extracted from the simulations. The results indicate that a boundary of mode mix exists between a region where major plastic dissipation is present and a region where it is not. Without major plastic dissipation, the fracture energy is low and essentially governed by the cohesive properties. This is the case in peel dominated loading cases. In shear dominated loading cases plastic dissipation gives a substantial contribution to the fracture energy. The results show that pure shear loading gives the largest fracture energy.

Place, publisher, year, edition, pages
Elsevier, 2008. Vol. 40, no 8, 665-672 p.
Keyword [en]
Mixed mode; Cohesive laws; Fracture energy; Traction–separation laws; Representative volume element; Adhesive
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hj:diva-24118DOI: 10.1016/j.mechmat.2008.02.006OAI: oai:DiVA.org:hj-24118DiVA: diva2:726079
Available from: 2014-06-17 Created: 2014-06-17 Last updated: 2015-11-13
In thesis
1. Meso-Mechanical Modeling and Analysis of Adhesive Layers
Open this publication in new window or tab >>Meso-Mechanical Modeling and Analysis of Adhesive Layers
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is concerned with the modeling, simulation and analysis of adhesive layers. By use of an in situ scanning electron microscopy study it is found that the adhesive studied in the present thesis has a very complex structure with two different compounds, a mineral and an epoxy/thermoplastic blend. A representative volume element (RVE) model is developed to study the behavior of the adhesive layer at the meso-level. It is a continuum model where interface finite elements are implemented at the boundaries of the continuum elements in order to enable crack initiation and propagation of micro cracks. On a structural level, two deformation modes, modes I and II, dominate the behavior of thin adhesive layers. With the RVE it is possible reproduce experimental stress-deformation relations from both modes. However, in a real structure, mixed mode loading usually occur. A range of mode mixes is studied, using the RVE, from an un-loaded state until fracture of the layer. The results indicate that the behavior of the interface elements dominate for mode mixes close to mode I and plasticity in the continuum elements dominates for mode II dominated mode mixes. Furthermore, effects of large root curvatures of the adherends is analyzed numerically by simulating plastically deforming double cantilever beam specimens using the finite element model. The developed RVE is implemented in the models to simulate the behavior of the adhesive layer. By this methodology, virtual experiments can be analyzed with extreme detail. It is shown that in-plane straining of the adhesive layer significantly influences the strength of adhesive joints at large plastic strain of the adherends. There is a never ending need in industries to minimize computational time. To this end, an interphase finite element for structural analyses is developed. The element considers in-plane straining of the adhesive layer due to large curvatures of surrounding substrates.

Place, publisher, year, edition, pages
Göteborg: Chalmers tekniska högskola, 2007. 13 p.
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:hj:diva-24122 (URN)978-91-7291-998-3 (ISBN)
Public defence
2007-10-04, Hörsalsvägen 2b, Göteborg, 13:00 (Swedish)
Opponent
Supervisors
Available from: 2015-02-05 Created: 2014-06-17 Last updated: 2015-02-05Bibliographically approved

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