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Abstract
Previous work has identified the need for a multiaxial visco-plastic model that can be used in the stress analysis of adhesively bonded structures. Such a model should also be capable of reflecting the hydrostatic sensitivity displayed by such polymeric systems. This paper outlines the development of an appropriate uniaxial model, discusses the role of the various parameters, and outlines methods of fitting actual experimental data derived from creep, relaxation, recovery, and constant strain rate tests on two different adhesive systems. Two different schemes are then discussed to extend the model for multiaxial conditions. These have been integrated into a finite element code as user routines and details of the tangential modulus matrix are briefly presented. Following benchmark testing, these models have been used to predict the rate-dependent response of an adhesively bonded structure with considerable success.