Strength of adhesively bonded joints under mixed axial and shear loading

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• 作者：Gré ; gory Bresson^a ; ^b ; Julien Jumel^a ; Martin E.R. Shanahan^a ; ^{martin.shanahan@u-bordeaux1.fr} ; Pierre Serin^b
• 关键词：Adhesive strength ; Arcan test ; Mixed mode ; Statistical analysis
• 刊名：International Journal of Adhesion and Adhesives
• 出版年：2012
• 期刊代码：75_01437496
• 类别：et
• 出版时间：June, 2012
• 卷：35
• 期：Complete
• 页码：27-35
• 文件大小：1521 K

摘要

This study aims at optimising adhesive properties in an aluminium/structural epoxy assembly for different conditions of surface pre-treatment. We consider the mechanical behaviour and failure under proportional, multi-axial loading using an instrumented, Arcan-type test. Values of fracture strength were found to be dispersed (even for a given surface treatment). Typically dispersion was of the order of 15%. This statistical behaviour, also observed with a simple tensile test, seems to be related to the heterogeneous nature of the microstructure of the adhesive bond, which contains voids, as well as mineral particles for reinforcement. A statistical analysis is suggested for use in conjunction with a strength envelope in practical design, for cases when the stress distribution is significantly heterogeneous. It is believed that this approach may be developed in order to understand the well-known scatter of adhesion strength results, and thus contribute to better reliability assessment.