Influence of surface pre-treatment on the shear stress-strain relationships of structural adhesives
conference paper
Using two types of adhesively bonded aluminium joints, a TAST specimen and a specifically designed stiff double lap joint, experiments show that the (apparent) yield stress, the amount of plastic flow and the occurence of strain hardening is influenced by the surface pre-treatment used for an Al-Mg-Si aluminium alloy adherend. Grit blasted specimens (220 grade alumina grit) fail shortly after yielding of the adhesive and do not reveal any macroscopic effects of strain hardening. Phosphoric acid anodised (PAA) specimens show a lower yield stress and yielding that is followed by a significant amount of plastic flow and the occurrence of strain hardening. additional experiments and non-linear finite element analysis indicate the spatial distribution of stress raisers at the interface to be the governing phenomenon to explain this difference in behaviour
TNO Identifier
330079
Source title
SAE-VI Structural Adhesives in Engineering, Bristol, UK, July 2001
Pages
1-5
Files
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