Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach

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 concent...

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Bibliographic Details
Published in:International journal of adhesion and adhesives 2015-04, Vol.58, p.44-52
Main Authors: Lee, Mildred, Yeo, Eudora, Blacklock, Matthew, Janardhana, Madabhushi, Feih, Stefanie, Wang, Chun H.
Format: Article
Language:English
Subjects:
Adhesive bonding
Adhesive strength
Adhesives
Bonded joints
Cohesion
Cohesive model
Failure criterion
Mathematical models
Plastic deformation
Strength
Stress concentration
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Summary: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.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2015.01.006