1. Key features
1.1 Plastics and viscoelastic materials
It follows that the relationships that can be established between the stresses σ imposed on them and the resulting deformations ε involve time t. To see this for yourself, simply apply a constant uniaxial tensile load to a plastic bar, and you'll see that the deformation measured immediately after the load is applied continues to increase. Clearly, a simple, purely elastic model cannot describe this behavior.
If a rigid PVC profile is bent on itself at room temperature, its appearance changes at the point of bending: it becomes lighter in the stretched section and darker in the compressed section, but no breakage is observed.
If the end of this profile had been struck against a hard surface, part...
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Key features
Solid-state polymer rheology
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"Plastics and composites"
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Solid-state polymer rheology
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