Thermomechanical Modeling of Engineering Surfaces in Sliding Contact

0084632在现代工程实践中，依靠摩擦响应的系统和部件无处不在。 离合器、制动器和摩擦密封件是机械工程中众所周知的例子。尽管滑动接触问题看起来很简单，它的经济重要性，以及近几十年来致力于研究这一主题的努力，但对行为的许多方面的详细物理理解仍然是难以捉摸的，特别是与热效应有关的那些。在这个项目中，在基于模型的模拟的探索性研究的倡议下，我们将开发一个计算力学方法来模拟这些问题的基础上，多层次的边界元法，可以扩大到解决大型问题。一个不稳定的三维热机械配方，包括表面纹理和近表面的非线性将实施。将采用与速度或温度有关的摩擦力。计算方法，而完全三维的性质，将首先被应用到一系列的旋转环几何形状，将在物理实验的计划研究。 实验将与基于固定环或盘在恒定和非稳态滑动条件下的全场变形分析的计算结果相一致。***

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. ***