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以我国自主研制的尼龙1010为基体,氧化铁(Fe3O4)和氧化铜(CuO)为增强剂,进行氧化物/尼龙复合材料的滚动疲劳实验,研究氧化物/尼龙复合材料的滚动疲劳机制。通过实验发现周期性应力导致在材料临界深处形成显微裂纹和显微空穴成核,裂纹扩展导致形成片晶形磨屑,显微裂纹和显微空穴成核是剥层磨损的主要因素。氧化物颗粒割裂了尼龙1010的基体,在接触应力和摩擦热的复合作用下,表面金属氧化物颗粒由于复合材料表面界面疲劳开裂而剥落,形成表面疲劳。30%CuO/尼龙1010复合材料的抗滚动疲劳磨损性能最好,疲劳磨损量只有尼龙的70%左右;10%Fe3O4/尼龙1010复合材料耐磨性能最差,滚动疲劳磨损量是尼龙的2.4倍。
The rolling fatigue test of oxide / nylon composites was carried out with Nylon 1010 as matrix, Fe3O4 and CuO as reinforcements, and the rolling fatigue mechanism of oxide / nylon composites was studied. It was found through experiment that the periodic stress resulted in the formation of micro-cracks and micro-hole nucleation in the critical depth of the material. The crack growth led to the formation of platelet-shaped wear debris. The micro-cracks and micro-hole nucleation were the main factors . Oxide particles fracture the matrix of nylon 1010. Under the combined action of contact stress and frictional heat, the surface metal oxide particles peel off due to fatigue cracking at the interface of the composite material to form surface fatigue. The wear resistance of 30% CuO / nylon 1010 composites is the best, and the fatigue wear is only about 70% of nylon. The wear resistance of 10% Fe3O4 / nylon 1010 composites is the worst, and the rolling fatigue wear is 2.4 times that of nylon .