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Test methods for assessing durability performance of adhesive joints.

Broughton, W R (1999) Test methods for assessing durability performance of adhesive joints. NPL Report. CMMT(A)208

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This report presents three test methods that can be used to assess durability of adhesive joints under combined cyclic or static loading and hostile environments. Two of these methods: (i) thick adherend shear test (TAST) loaded in compression; and (ii) tapered strap joint can be used to characterise the shear behaviour of adhesive materials. These methods complement existing techniques by providing alternative solutions to the measurement of shear properties. The compression TAST specimen is a much smaller specimen than the standard geometry and is suitable for measuring the shear properties of bonded panels with a total thickness of 5 to 6 mm. The smaller specimen offers the potential for rapid environmental conditioning. The tapered strap joint is compatible for use with standard type extensometers. Thus, it is useful for measuring changes in stiffness for cyclic fatigue tests and for monitoring creep strain.
The third method, the skin-doubler test, in contrast is more representative of real-life structures (e.g. T-joint flange). The large bond length associated with the technique enables maximum load transfer from the skin to the doubler. The procedure allows the determination of shear stress/strain distributions along the bond length and can also be used to measure the ply drop strength for co-bonded and co-cured composites. Symmetric and non-symmetric specimen configurations are covered in the procedure. The technique can be used under combined hostile environments and cyclic loading conditions. The draft procedures presented in this report are working documents written in the International Standards format.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMMT(A)208
Subjects: Advanced Materials
Advanced Materials > Adhesives
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/1280

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