Modelling the large strain constitutive behaviour of polycarbonate under isothermal and anisothermal conditions
Sweeney, John Caton-Rose, Philip D. Coates, Philip D.
Sweeney, John
Caton-Rose, Philip D.
Coates, Philip D.
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2005
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Abstract
We have studied the tensile behaviour of polycarbonate at large strains
below the glass transition temperature. Experiments have been carried out at a series of constant temperatures and also under conditions of falling temperature. The specimens neck with a natural draw ratio of ~2, and the study focuses mainly on the necked material. Isothermal experiments reveal an elastic mechanism that initiates beyond the natural draw ratio. A model consisting of an Eyring process and two Gaussian elastic mechanisms is shown to be applicable to both the isothermal and anisothermal stress relaxation and stress-strain results. The same model also produces reasonable estimates of the stresses generated during the necking process. In addition, a simple relationship
between isothermal and anisothermal stress relaxation is demonstrated.
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Sweeney J, Caton-Rose PD and Coates PD (2005) Modelling the large strain constitutive behaviour of polycarbonate under isothermal and anisothermal conditions. Journal of Applied Polymer Science. 96(6): 2105-2116.
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