Dependence of the Tensile Properties of Polyethylene on Strain Rate and Temperature

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概要

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• Tensile stress-strain curves for a drawn polyethylene filament were measured at strain rates between 10%/min and 1000%/min. This was carried out at 10° intervals from 0 to 80°C. The effects of strain rate and temperature on the ultimate strain, tensile strength, yield strength and on initial elastic modulus were investigated by the time-temperature superposition method which was extended by Takemura so as to take account of the effect of the amount of crystallinity and orientation.When the observed values are plotted against log strain rate, it seemes to be necessary to introduce a vertical translation, in order to superpose each curves observed at different temperature by horizontal shift. As an approximation we used a value of vertical translation which was calculated for the isotropic polyethylene. When this vertical translation was applied to the data for the ultimate strain, tensile strength and yield strength, reasonable values for the shift factor along the log strain rate axis were obtained, in spite of the fact that in this case the deformation exceeds the range of linear viscoelasticity. The horizontal shift factors were slightly different from each other. Activation energies obtained by plotting the horizontal shift factors against temperature were all about 20Kcal/mol. On the other hand, an activation energy obtained by application of the same superposition method to the initial elastic modulus was unreasonably large as compared with that obtained by Nagamatsu and his co-workers in the stress relaxation experiment.

• 社団法人 日本材料学会の論文

社団法人 日本材料学会 | 論文

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