The mechanisms of wear phenomena for fibrous materials are classified in four kinds under various rubbing conditions as follows; (1) frictional wear, (2) ploughing or abrasive wear, (3) shaving wear and (4) fatigue wear. In this experiment, the steel roller (18mmφ) with sharp bezels on surface is used for the abradant, in order to carry on the experiment under the shaving wear condition.The samples used are monofilaments of polypropylene (417d) and polyethylene (402d).The following results are obtained;(1) The dead weight added on the fiber during wear test, SB, is expressed as follows;SB=CoNB-Kswhere NB is the number of rubbing cycles up to rupture, Co and Ks are constants.(2) The temperature dependence of dead weight to break at NB=1000, SB·1000, shows two maxima for both the polymers.(3) In the case of polypropylene, the maxima of SB·1000 appear at about 48°C and 98°C. In the region 20∼50°C, there is but little change in tensile strength, elongation and total frictional force, therefore the maximum of SB·1000 at about 48°C seems to be due to the variations of wear-resistance and internal friction with temperature. On the other hand, the maximum of SB·1000 at about 98°C may be considered as derived from the temperature dependence of mechanical properties.(4) In the case of polyethylene, the maximums of SB·1000 appear at lower temperature than on the case of polypropylene. But the temperature dependence of SB·1000 in both the polymers shows very similar behavior with each other against the reduced temperature, T-Tαa, where Tαa is the temperature at which the main dispersion appears in the dynamic viscoelastic behavior of the polymers.Consequently, the temperature depndence of wear-resistance seems to be dependent on polymer properties, especially molecular motion of polymer.(5) The relationship between the wear resistance and the mechanical properties is described qualitatively as follows;amount of wear loss ∞total frictional force/modulus×tensile strength×elongation.
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Kishi et al. (1965) studied this question.