Abstract
The bondline thickness is a crucial parameter affecting the strength and toughness of adhesive joints. This parameter is responsible for the stress distribution, and thus, the efficiency of the stress transfer between the adherends, the failure modes, and the correspondent failure loads. However, the available literature reports different trends and relationships during testing between the thickness and strength, or thickness and toughness. In this chapter, the effect of adhesive thickness on the mechanical properties of adhesive joints is explored using the fracture mechanics framework. Two testing cases are discussed in detail: (i) soft bondlines joining rigid adherends, that is, butt joint and single end notch testing specimens, and (ii) rigid bondlines joining flexible adherends, that is, double cantilever beam geometry. These cases represent two extremes in terms of where the energy is stored while testing: in the first one, the energy is stored in the adhesive while in the second, the energy is stored in the adherends. From this discussion, the bondline thickness emerges as a critical geometrical parameter dictating transition between the two extreme cases. A single theoretical framework is provided that merges the two cases and is used to disclose the recently obtained experimental results.
Original language | English |
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Title of host publication | Advances in Structural Adhesive Bonding, Second Edition |
Publisher | Elsevier |
Pages | 615-641 |
Number of pages | 27 |
ISBN (Electronic) | 9780323912143 |
ISBN (Print) | 9780323984379 |
DOIs | |
Publication status | Published - 2023 |
Bibliographical note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-careOtherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Keywords
- Adhesive thickness
- Crack onset
- Poisson’s ratio effect
- Singular stress fields
- Thick bondlines