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Rate and temperature dependent mechanical properties of a flexible adhesive.

Duncan, B C; Hinopoulos, G; Ogilvy-Robb, K; Arranz, E (2000) Rate and temperature dependent mechanical properties of a flexible adhesive. NPL Report. CMMT(A)262

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Design stress analyses of adhesively bonded structures may be performed using Finite Element methods provided that suitable material models and mechanical properties data are available. Flexible adhesives appear to be best modelled by hyperelastic models. However, their properties are dependent on strain rate and temperature. The aim of this work is to characterise the behaviour of a typical flexible adhesive. Statistical analysis of bulk specimen tensile and single-lap joint shear tests shows that stress at failure increases with decreasing temperature and increasing strain rate. Strain-to-failure shows less significant dependence. Within the hyperelastic temperature region and at strain rates up to 10-1 s-1, the statistical analyses show that temperature has a higher influence than strain rate on the material properties. There is a reasonable correlation between failure stress values in tensile and single-lap joint tests. The mechanical properties have been investigated using visco-elastic models. Rate dependence of the adhesive stress-strain response can be described using a relaxation model. Time-temperature superposition shows some promise for modelling the failure of the adhesive specimens.
This work has shown that there is no single property that will describe the mechanical or failure properties of the flexible adhesive studied since these properties vary with temperature and strain rate. Appreciation of this is vital when load bearing joints are designed so that all possible service conditions can be considered. However, these findings indicate that there are methods that can model the rate and temperature behaviour of the adhesive and of the bonded joint. These would enable interpolation of properties to conditions not measured and, potentially, allow extrapolation to conditions beyond the range measured.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMMT(A)262
Subjects: Advanced Materials
Advanced Materials > Adhesives
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/1843

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