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对TiN膜/碳钢基材体系摩擦磨损过程的有限元模拟表明:磨痕边缘的多种应力集中、磨痕内外的张应力、膜/基界面切应力,都将影响体系的摩擦学行为.用销/盘试验验证了有限元模拟结果,根据对膜层中裂纹的萌生、扩展和体系的损伤、破坏情况分析,摩擦磨损过程分为磨合、稳定磨损、膜层失稳、体系失效阶段.提出了小载荷摩擦磨损下过软基材的膜/基体系失效机制,即膜层在集中应力和张应力作用下发生裂纹萌生和扩展的脆性破坏,其中,由于体系变形引起的磨痕边缘应力集中对膜层早期损伤进而导致体系磨损失效具有最重要作用.
The finite element simulation of the friction and wear process of TiN film / carbon steel substrate system shows that the various stress concentrations at the edge of the wear scar, the tensile stress inside and outside the wear scar, and the shear stress at the film / substrate interface all affect the tribological behavior of TiN film / carbon steel substrate. According to the analysis of the crack initiation and propagation in the film and the analysis of the damage and destruction of the system, the friction and wear process is divided into running-in, stable wear, instability of the film and failure of the system. The failure mechanism of the film / matrix system with soft substrate under the condition of small load and friction and wear is put forward, that is, the brittle fracture of the film occurs under the action of concentrated stress and tensile stress. The edge stress Focus on the early damage to the film and then lead to system wear failure has the most important role.