Experimental investigations on fracture of polymers

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Abstract
This article describes the experimental investigations on fracture of a polymeric material under various uniaxial and biaxial stress fields, at controlled rates of loading. The biaxial stress fields have been produced by subjecting tubular specimens to pure internal pressure, internal pressure combined with tension loading, pure torsion and torsion combined with tension loadings. The experimental arrangements developed for conducting the above tests have been described. Examination of fractured specimen subjected to various biaxial stress fields indicates that the fractured surface is mostly along the plane of maximum normal stress. However, the mode of fracture in the case of pure compression test resembles that of a brittle material. From the experimental fracture data, limiting failure curves for the material have been obtained corresponding to various maximum extension ratio rates. The experimental failure data were compared with various criteria of failure essentially developed for metals. It was found that none of the classical failure criteria applies to the material tested.

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