Wang Yang, Xu Jingxiang, Ootani Yusuke, Ozawa Nobuki, Adachi Koshi, Kubo Momoji
Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan.
Department of Mechanical System Engineering Graduate School of Engineering Tohoku University 6-6-01 Aoba, Aramaki Aoba-ku Sendai 980-8579 Japan.
Adv Sci (Weinh). 2020 Dec 7;8(2):2002827. doi: 10.1002/advs.202002827. eCollection 2021 Jan.
Wear of contact materials results in energy loss and device failure. Conventionally, wear is described by empirical laws such as the Archard's law; however, the fundamental physical and chemical origins of the empirical law have long been elusive, and moreover empirical wear laws do not always hold for nanoscale contact, collaboratively hindering the development of high-durable tribosystems. Here, a non-empirical and robustly applicable wear law for nanoscale contact situations is proposed. The proposed wear law successfully unveils why the nanoscale wear behaviors do not obey the description by Archard's law in all cases although still obey it in certain experiments. The robustness and applicability of the proposed wear law is validated by atomistic simulations. This work affords a way to calculate wear at nanoscale contact robustly and theoretically, and will contribute to developing design principles for wear reduction.
接触材料的磨损会导致能量损失和器件故障。传统上，磨损是由诸如阿查德定律等经验定律来描述的；然而，这些经验定律的基本物理和化学根源长期以来一直难以捉摸，而且经验磨损定律在纳米尺度接触中并不总是成立，这共同阻碍了高耐久性摩擦系统的发展。在此，提出了一种适用于纳米尺度接触情况的非经验且稳健适用的磨损定律。所提出的磨损定律成功揭示了为什么纳米尺度的磨损行为在某些情况下虽然仍遵循阿查德定律的描述，但并非在所有情况下都如此。通过原子模拟验证了所提出磨损定律的稳健性和适用性。这项工作提供了一种在理论上稳健地计算纳米尺度接触磨损的方法，并将有助于制定减少磨损的设计原则。
