Dean, G; Crocker, L E (2000) Comparison of the measured and predicted deformation of an adhesively bonded lap-joint specimen. NPL Report. CMMT(A)293

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Abstract

Force versus extension curves and strain distributions for a lap-joint specimen have been calculated using finite element analyses. The specimen is bonded using a modern rubber toughened adhesive chosen for its high toughness. Calculations have been made over a range of loading speeds using the linear and exponent Drucker-Prager materials models. The measurement and analysis of experimental data needed to derive the materials parameters and properties required for the predictions are described. Particular attention has been given to the acquisition of data at high strain rates that are relevant for predictions of performance under impact.
The predicted force/extension curves are compared with measured data and are seen to lie at consistently higher force levels for each loading speed. An explanation for this is proposed associated with the progressive rupture of the adhesive layer under load. This explanation is supported by the results of failure measurements on bulk and butt-joint specimens of the adhesive and calculations of strain distributions in the adhesive before and after the onset of rupture.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	CMMT(A)293
Subjects:	Advanced Materials Advanced Materials > Adhesives
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2018

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