Viscoelasticity for characterisation

The important point is that the deformational measurements and observations of fracture provide methods for characterising gum rubber. Because the characterisation results must be related to the processability, the above method is most suitable for the purpose. 

Examples are presented in Section 4.1 of the characterisation of two samples of NBR using tensile stress-strain measurements. The presentation concerns deformational behaviour only, and the failure behaviour will be discussed in Section 4.4. 

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