Strength of adhesively bonded joints under mixed axial and shear loading |
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| Affiliation: | 1. Université de Bordeaux, Institut de Mécanique et d''Ingénierie—Bordeaux (I2M) UMR 5295, 351 cours de la libération, 33405 Talence Cedex, France;2. Centre National d''Etudes Spatiales, Direction des Lanceurs, rond point de l''Espace, 91023 Evry Cedex, France;1. Department of Lightweight Design with Structured Materials, Brandenburg University of Technology Cottbus-Senftenberg, Cottbus D, 03046, Germany;2. Chair of Physical Metallurgy and Materials Technology, Brandenburg University of Technology Cottbus-Senftenberg, Cottbus D, 03046, Germany;1. Faculty of Engineering and Industrial Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia;2. University of Baghdad, Baghdad, Iraq;3. Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia |
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| Abstract: | 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. |
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