Grigoriev Aleksandr S, Shilko Evgeny V, Dmitriev Andrey I, Tarasov Sergey Yu
Institute of Strength Physics and Materials Science SB RAS, Tomsk 634055, Russia.
Phys Rev E. 2020 Oct;102(4-1):042801. doi: 10.1103/PhysRevE.102.042801.
Surface temperature is among crucial factors which control wear during sliding dry contact. Using computer modeling, we study the possibility to achieve close to zero rate of surface wear during sliding friction of the special type of materials which possess negative thermal expansion. The numerical simulations reveal two wear regimes for materials with negative thermal expansion coefficient as dependent on the applied normal stress level. When the applied stress is lower than that of a critical level, a steady almost zero wear rate and nanorough surface are achieved during friction. Otherwise, wear rate is of the same order of magnitude as for "traditional" materials with positive thermal expansion coefficient. The critical stress value is analyzed depending on the material's mechanical, thermophysical, and surface roughness characteristics.
表面温度是控制干滑动接触过程中磨损的关键因素之一。通过计算机建模，我们研究了在具有负热膨胀特性的特殊材料滑动摩擦过程中实现接近零表面磨损率的可能性。数值模拟揭示了负热膨胀系数材料在滑动摩擦时，根据所施加的法向应力水平存在两种磨损状态。当施加的应力低于临界水平时，摩擦过程中可实现稳定的几乎为零的磨损率以及纳米级粗糙表面。否则，磨损率与具有正热膨胀系数的“传统”材料处于同一数量级。根据材料的机械、热物理和表面粗糙度特性对临界应力值进行了分析。
