The Effect of Plastic Deformation on the Flattening of Friction Surfaces

• الحاوية / القاعدة: Lubricants
• المؤلفون الرئيسيون: Alexey Moshkovich, Igor Lapsker, Lev S. Rapoport
• التنسيق: مقال
• اللغة: الإنجليزية
• منشور في: MDPI AG 2024-08-01
• الموضوعات: friction; wear; flattening; plastic deformation; top of form
• الوصول للمادة أونلاين: https://www.mdpi.com/2075-4442/12/8/276

This work aims to demonstrate the discrepancy between the results achieved in the application of ball-on-flat devices. Meanwhile, the interaction between contact parameters and the morphology of friction surfaces will be considered. Flattening depends on the mechanical properties of contact materials and the variation in the deformed structure in surface layers. To evaluate the interaction between roughness parameters and contact pressure, wear, and morphology of the surfaces, a ball-on-disk rig was applied. The average groove sizes were measured on micro- and macroscales. The relation between groove sizes on micro- and macro scales is close to the same. The flattening sinusoidal ball-on-flat model was considered. The real friction and wear tests were used to analyze plastic deformation by accounting for dislocation gliding and the interaction between neighboring asperities. The relation of shear stresses to the interference of rough asperities was established. The effective plastic strain gradient was evaluated. The formation of a highly effective plastic strain gradient is associated with a high dislocation density. The effect of dislocation density on the hardening–softening of surface layers is considered.