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

Lee, Mildred, Yeo, Eudora, Blacklock, Matthew, Janardhana, Madabhushi, Feih, Stefanie and Wang, Chun H. (2015) Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach. International Journal of Adhesion & Adhesives, 58. pp. 44-52. ISSN 0143-7496

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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.

Item Type:	Article
Uncontrolled Keywords:	Stress concentration, Cohesive model, Failure criterion
Subjects:	F200 Materials Science H800 Chemical, Process and Energy Engineering J400 Polymers and Textiles
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Becky Skoyles
Date Deposited:	26 Jun 2018 08:42
Last Modified:	10 Oct 2019 17:48
URI:	http://nrl.northumbria.ac.uk/id/eprint/34698

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