Abstract
The sliding friction behavior of low density and high density polyethylenes with normal pressure and velocity is investigated for unlubrtcated conditions using the conventional friction measuring arrangement. Apart from its dependence on velocity, the coefficient of friction is found to vary significantly with normal pressure. The investigation of friction at very high contact pressures, as encountered in deformation processing, has been carried out for the case of direct extrusion using an instrumented extrusion die with movable head. The variation of extrusion and die-head force with ram travel is recorded for particular ram speeds. The extrusion data has been analyzed assuming von Mises1 yield criterion and spherical velocity fields and using the adhesion and constant shear theories of friction. The frictional shear stress and coefficient of friction are calculated for the state of stress involved in the extrusion process. The frictional shear stress of low density polyethylene is found to be of the order of its bulk shear strength which is in agreement with the adhesion theory of friction.
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© 1974 Plenum Press, New York
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Saleem, M.A., Bahadur, S. (1974). Polymer Friction under Conditions of Deformation Processing. In: Lee, LH. (eds) Advances in Polymer Friction and Wear. Polymer Science and Technology, vol 5. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-9942-1_9
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DOI: https://doi.org/10.1007/978-1-4613-9942-1_9
Publisher Name: Springer, Boston, MA
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