Abstract
One major characteristic of bonded structures is the highly localised nature of deformation near sharp corners, ply-terminations, and ends of joints where load transfer occurs. This paper presents an investigation of the use of a cohesive zone model in predicting the strong effects of stress concentration due to varying adherend thickness on the pull-off strength measured by the Pneumatic Adhesion Tensile Testing Instrument. A comparison is made with the point-strain-at-a-distance criterion, where the plastic deformation of the adhesive is analysed using a modified Drücker-Prager/cap plasticity material model. The fracture properties of the cohesive zone model were determined using double-cantilever and end-notch flexural specimens, and the cohesive strengths were measured using tensile and lap shear tests. Comparisons with experimental results reveal that the cohesive zone model with perfectly plastic (or non-strain-softening) cohesive law provides accurate predictions of joint strengths.
Original language | English |
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Pages (from-to) | 44-52 |
Number of pages | 9 |
Journal | International Journal of Adhesion and Adhesives |
Volume | 58 |
Early online date | 21 Jan 2015 |
DOIs | |
Publication status | Published - 1 Apr 2015 |
Externally published | Yes |
Keywords
- Cohesive model
- Failure criterion
- Stress concentration