Broughton, W R; Hinopoulos, G (1999) Evaluation of the single-lap joint using finite element analysis. NPL Report. CMMT(A)206

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Abstract

This report evaluates the effect of moisture, specimen geometry and adherend properties on the behaviour of the single-lap joint. Finite element analyses was used to establish the effects of these parameters on the joint stiffness and stress distribution within the adhesive layer. The report also includes an evaluation of the perforated single-lap joint, assumed to promote accelerated ageing by shortening the diffusion path of moisture. A series of stress and deformation analyses using finite element analysis (FEA) has been conducted on the single-lap configuration for this purpose. The analyses were based on experimental data obtained from data generated within the DTI funded ADH and PAJ programmes.
The effect of moisture on the joint performance was investigated using a sequentially coupled mechanical-diffusion finite element model that incorporated continuously varying adhesive material properties. The numerical predictions revealed that the stress distributions become more uniform along the adhesive layer with increasing moisture content. Peel stresses at the ends of the bonded area also decrease with increasing moisture content. The introduction of holes decreases the time taken for the moisture content in the adhesive layer to reach saturation, although increasing the size of the holes and reducing the bonded area only has a marginal effect on the joint performance.
The parametric studies on the specimen geometry revealed that stress distributions are sensitive to changes in adherend material properties, adherend and adhesive thickness and the applied load. In general, stresses were reduced when changes to the joint resulted in smaller joint displacement or an increase in the ability of the adhesive layer to plastically deform.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)206
Subjects:	Advanced Materials Advanced Materials > Mechanical Measurement
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/1281

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