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Project PAJ2, Report No. 5. The application of finite element methods to the design of adhesive joints.

Dean, G; Hu, F; Duncan, B C (1998) Project PAJ2, Report No. 5. The application of finite element methods to the design of adhesive joints. NPL Report. CMMT(A)102

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Abstract

This article has been submitted for publication in the magazine Benchmark which is published by the association of finite element users NAFEMS. It summarises recent work in Project PAJ2 on the evaluation of the applicability of elastic-plastic models in FE packages for describing the deformation of tough adhesives at large strains. The limitations of these models is evident from the results of tests carried out in tension and shear on bulk specimens and in tension on butt-joint specimens of selected adhesives. The exponent Drucker-Prager model appears to satisfactorily describe the deformation behaviour of a toughened epoxy over the range of stress states generated by these tests. However, results on a toughened acrylic could not be accurately described using this model.
These observations are consistent with the interpretation that deformation under tension is controlled by a different plastic deformation mechanism from deformation under shear. If this is generally true for toughened adhesives, then the ability of the exponent Drucker-Prager model to describe deformation of the epoxy adhesive may be fortuitous.
A more full account of the data analysis and the measurement methods used to obtain the
data presented will be given in a subsequent report from the Project.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMMT(A)102
Subjects: Advanced Materials
Advanced Materials > Adhesives
Advanced Materials > Polymers
Last Modified: 07 Sep 2018 14:29
URI: http://eprintspublications.npl.co.uk/id/eprint/998

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