Thermomechanical Modeling of Engineering Surfaces in Sliding Contact

在现代工程实践中，依赖摩擦响应的系统和部件无处不在。离合器、刹车和摩擦密封圈都是机械工程中众所周知的例子。尽管滑动接触问题显然很简单，具有重要的经济意义，而且近几十年来一直致力于这一主题的研究，但对行为的许多方面，特别是与热效应有关的方面，仍然缺乏详细的物理理解。在基于模型的仿真探索性研究项目的支持下，我们将开发一种基于多层边界元方法的计算力学方法来模拟这些问题，这种方法可以扩展到解决大型问题。将实施一种包括表面结构和近表面非线性的非定常三维热力学公式。将采用与速度或温度相关的摩擦。这些计算方法虽然在本质上是完全三维的，但首先将应用于一系列旋转环几何形状，这些几何形状将在并行的物理实验程序中进行研究。实验结果将与基于定常和非定常滑动条件下静环或圆盘全场变形分析的计算结果进行比较。***

0084632SoomIn modern engineering practice, systems and components that rely onfrictional response are ubiquitous. Clutches, brakes and rubbing sealsare well known examples from mechanical engineering. Despite the apparentsimplicity of the sliding contact problem, its economic importance, andthe efforts that have been devoted to research on this topic recentdecades, a detailed physical understanding of many aspects of behaviorremains elusive, particularly those associated with thermal effects. Inthis project, supported under the initiative on Exploratory Research on Model Based Simulation, we will develop a computational mechanics approach tomodeling these problems based on a multi-level boundary element methodwhich can be scaled up to solve large problems. An unsteadythree-dimensional thermomechanical formulation that includes surfacetexture and near-surface nonlinearities will be implemented. A speedor temperature dependent friction will be employed. The computationalmethods, while fully three-dimensional in nature, will initially beapplied to a series of rotating ring geometries that will be studied in aparallel program of physical experiments. The experiments will becompared with computational results based on full field deformationanalysis of a stationary ring or disc under both constant and unsteadysliding conditions. ***