Abstract
An experimental investigation into the effects of size of cylindrical test specimens on observed axial, lateral and volumetric stress-strain behaviour and strength is described. The effects of end restraint were examined by (1) comparing the output from strain gauges located at different points on test specimens and (2) comparison of stress-strain relationships determined by overall deflection measurements with those from strain gauges bonded over the central zone of specimens. General empirical relationships between slenderness ratio, 50% tangent Young's modulus and ultimate strain, for the different methods of strain measurement were determined. Strain measurements on specimens less than 50 mm dia, are high and not representative of material behaviour. The degree of non-uniformity of strain distribution, in unixially loaded cylindrical specimens was found to increase with increasing stress.
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