EFFECT OF REINFORCING POLYPROPYLENE BY STEEL WIRES ON FRICTION COEFFICIENT AND WEAR

Journal of the Egyptian Society of Tribology Pub Date : 2023-01-01 DOI:10.21608/jest.2023.284016

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Abstract

The effect of reinforcing polypropylene (PP) by unidirectional continuous steel wires on friction coefficient and wear was discussed in this work. Scratch test was carried to evaluate the tribological performance of the proposed composites. The tested composites were sheets PP of 5.0 mm thickness. The steel reinforcing wires were 0.3, 0.5, 0.6, 0.7 and 0.8 mm diameters. The numbers of wires reinforcing the test specimens were 0, 3, 6, 9, 12 and 15. The wires were distributed parallel to the direction of motion. It was observed that friction coefficient displayed by the scratch of PP reinforced by steel wires decreased with increasing number and diameter of steel wires. The presence of steel wires decreased the hardness of the PP so that the material removal by the indenter was easier, where PP was affected by the rate of cooling during molding. Besides, reinforcing PP by steel wires increased the rate of cooling causing softening of the PP matrix and decreased the hardness. It can be concluded that presence of steel wires experienced wear decreasing. In addition to that, the influence of the cooling rate on the hardness and the mechanical properties of the polymers affected the wear. Normal load showed pronounced effect on wear of PP.

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钢丝增强聚丙烯对摩擦系数和磨损的影响

研究了单向连续钢丝增强聚丙烯(PP)对摩擦系数和磨损的影响。通过划痕试验对复合材料的摩擦学性能进行了评价。测试的复合材料为5.0 mm厚的PP板材。钢筋直径分别为0.3、0.5、0.6、0.7、0.8 mm。加固试件的钢丝数分别为0、3、6、9、12、15根。导线平行于运动方向分布。结果表明，钢丝增强聚丙烯的摩擦系数随钢丝数量和直径的增加而减小。钢丝的存在降低了PP的硬度，因此压头更容易去除材料，而PP在成型过程中受到冷却速度的影响。此外，钢丝增强PP提高了冷却速度，导致PP基体软化，硬度降低。结果表明，钢丝的存在使磨损逐渐减少。此外，冷却速率对聚合物硬度和力学性能的影响也对磨损产生影响。正常负荷对PP的磨损有显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Journal of the Egyptian Society of Tribology

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