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Suppression of wear in dry sliding friction induced by negative thermal expansion
Physical Review E ( IF 2.4 ) Pub Date : 2020-10-16 , DOI: 10.1103/physreve.102.042801
Aleksandr S. Grigoriev , Evgeny V. Shilko , Andrey I. Dmitriev , Sergey Yu. Tarasov

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.

中文翻译:

抑制负热膨胀引起的干式滑动摩擦的磨损

表面温度是控制滑动干接触过程中磨损的关键因素之一。通过计算机建模,我们研究了具有负热膨胀性的特殊类型材料在滑动摩擦时表面磨损率接近零的可能性。数值模拟揭示了负热膨胀系数材料的两种磨损状况,取决于所施加的法向应力水平。当施加的应力低于临界水平时,在摩擦过程中可获得稳定的几乎零磨损率和纳米粗糙表面。否则,磨损率与热膨胀系数为正的“传统”材料的数量级相同。根据材料的机械,热物理和表面粗糙度特性分析临界应力值。
更新日期:2020-10-17
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