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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/65642

Title: Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach
Keywords: Polymer-matrix Composites (PMCs)
Stress/strain curves
Non-linear behaviour
Modelling
Issue Date: 18-May-2011
Publisher: Elsevier
Abstract: Abstract This paper presents the development of a constitutive model able to accurately represent the full non-linear mechanical response of polymer-matrix fibre-reinforced composites with unidirectional (UD) plies under quasi-static loading. This is achieved by utilising an elasto-plastic modelling framework. The model captures key features that are often neglected in constitutive modelling of UD composites, such as the effect of hydrostatic pressure on both the elastic and non-elastic material response, the effect of multiaxial loading and dependence of the yield stress on the applied pressure. The constitutive model includes a novel yield function which accurately represents the yielding of the matrix within a unidirectional fibre-reinforced composite by removing the dependence on the stress in the fibre direction. A non-associative flow rule is used to capture the pressure sensitivity of the material. The experimentally observed translation of subsequent yield surfaces is modelled using a non-linear kinematic hardening rule. Furthermore, evolution laws are proposed for the non-linear hardening that relate to the applied hydrostatic pressure. Multiaxial test data is used to show that the model is able to predict the non-linear response under complex loading combinations, given only the experimental response from two uniaxial tests.
URI: http://hdl.handle.net/2262/65642
ISSN: 02663538 (ISSN)
DOI: 10.1016/j.compscitech.2011.03.009
Rights: 2011
Affiliation: Department of Aeronautics, Imperial College London - Prince Consort Road--> , South Kensington--> , London--> , SW7 2AZ--> - UNITED KINGDOM (Vyas, G.M.)
UNITED KINGDOM (Vyas, G.M.)
Department of Aeronautics, Imperial College London - Prince Consort Road--> , South Kensington--> , London--> , SW7 2AZ--> - UNITED KINGDOM (Pinho, S.T.)
Department of Aeronautics, Imperial College London - Prince Consort Road--> , South Kensington--> , London--> , SW7 2AZ--> - UNITED KINGDOM (Robinson, P.)
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