论文标题
在粘附存在下圆柱碎片颗粒生长的机械模型
A mechanistic model for the growth of cylindrical debris particles in the presence of adhesion
论文作者
论文摘要
已知磨损体积在摩擦过程中不断增加，阿卡德（Archard）特别提出了一个模型，以描述在两体接触构型中抗腹部碰撞时磨损颗粒形成的可能性。虽然该模型在磨损的调查中很大程度上被采用，但自从该过程的早期阶段以来，在表面之间捕获的磨损碎屑的存在将系统变成了三体接触配置。在这样的配置中，在被困的碎屑和滑动体之间的界面处产生了大量的磨损。在这里，依靠分析模型，我们开发了一个框架，该框架描述了粒子表面接口处的三体配置中的裂纹生长。然后，我们表明裂纹生长在滑动表面内而不是在碎屑颗粒中受到青睐，并通过使用相位场折断的数值模拟来测试这种结果。这会导致磨损量增加和碎屑颗粒积聚，而不是分解。还研究了粘附，摩擦系数以及所应用的全球切向力和正常力的比率。
The wear volume is known to keep increasing during frictional processes, and Archard notably proposed a model to describe the probability of wear particle formation upon asperity collision in a two-body contact configuration. While this model is largely adopted in the investigations of wear, the presence of wear debris trapped between the surfaces changes the system into a three-body contact configuration already since the early stages of the process. In such a configuration, a significant amount of wear is produced at the interface between the trapped debris and the sliding bodies. Here, relying on analytical models, we develop a framework that describes crack growth in a three-body configuration at the particle-surface interface. We then show that crack growth is favoured within the sliding surfaces, instead of within the debris particle, and test such result by means of numerical simulations with a phase-field approach to fracture. This leads to an increase in the wear volume and to debris particle accretion, rather than its break down. The effects of adhesion, coefficient of friction, and ratio of the applied global tangential and normal forces are also investigated.
