Multiscale analysis of friction behavior at fretting interfaces

Abstract

Friction behavior at fretting interfaces is of fundamental interest in tribology and is important in material applications. However, friction has contact intervals, which can accurately determine the friction characteristics of a material; however, this has not been thoroughly investigated. Moreover, the fretting process with regard to different interfacial configurations have also not been systematically evaluated. To bridge these research gaps, molecular dynamics (MD) simulations on Al-Al, diamond-diamond, and diamond-silicon fretting interfaces were performed while considering bidirectional forces. This paper also proposes new energy theories, bonding principles, nanoscale friction laws, and wear rate analyses. With these models, semi-quantitative analyses of coefficient of friction (CoF) were made and simulation outcomes were examined. The results show that the differences in the hardness, stiffness modulus, and the material configuration have a considerable influence on the fretting process. This can potentially lead to the force generated during friction contact intervals along with changes in the CoF. The effect of surface separation can be of great significance in predicting the fretting process, selecting the material, and for optimization.

Metal matrix nanocomposites in tribology: Manufacturing, performance, and mechanisms

“…No matter which wear mechanisms are dominating, it could be seen that wear is a process described by mass transfer fundamentally. Of course, mass transfer needs energy exchange [104,132], but setting mass transfer as the essential characteristic for wear process could distinguish with friction and link with the widely-accepted morphology quantification results, as shown in Fig. 12.…”

“…4(a). One simple logic to understand the benefits of more nanophases is that, due to the strengthening effect, more nanophases will increase the hardness of the soft matrices, which reduces the possibility of being plowed by the harder counterpart and its fine features like asperities [103][104][105]. Therefore, more nanophases could mitigate the plowing effects during the tribological processes.…”

Effects of solid lubricants on the tribological behavior of steel‐backed UHMWPE fabric composites

“…The wear rates of the four composites were analyzed by cleaning, drying, and weighing samples before and after testing. Sample thickness was measured and the wear rate calculated using formula (3). Owing to the lack of enhanced fillers, UHMWPE-0 exhibited the highest wear rate compared to the others during the whole test (Figure 8).…”

“…As the shipping industry prosperously grows, energy consumption control and environmental protection has gained much attention and become an increasing issue in maritime development. [1][2][3] Usually, the lubricating method aboard ship requires oil application, which not only needs to be changed at regular intervals, but also costs space and energy to handle as a waste substance, resulting in large consumption in resources and environmental impact. [4][5] Particularly in marine functions, while under actual working conditions, lubricating oil is sometimes not easily added or changed in specific applications.…”

Tribo-informatics: Concept, architecture, and case study

“…In recent years, the field of tribology has experienced significant developments in both scope and depth [1]. Tribology has not only achieved many new developments in areas such as traditional lubrication [2], surface engineering [3], biotribology [4], and computational tribology [5,6], but also essential applications in new fields such as superlubricity [7] and triboelectric nanogenerators [8]. Significant research achievements have been gained in various tribology disciplines, including biology, materials science, and engineering.…”