考虑热力耦合效应的磨损剥层机理研究与计算分析

Study and Analysis of the Delamination Theory Based on the Coupling Effect Between Thermal Stress and Circular Shear Stress

现有的摩擦磨损机理与计算理论较少涉及滑动摩擦过程中的温度效应,提出了考虑摩擦温度应力与机械应力耦合情况下的一种摩擦磨损新机理与计算模型。具体地,首先依据摩擦界面原子受迫振动温升模型与计算理论得到滑动摩擦的界面摩擦热,应用热传导理论计算了摩擦金属体的温度分布;然后对单纯摩擦温度应力下金属基体的裂纹开展条件与分布规律进行了分析,提出了考虑热应力和界面循环剪切应力耦合作用的材料磨损剥层新机理,建立了该机理下的磨损物理模型,在合理假设的基础上推导了摩擦磨损计算公式;最后对一些典型的磨损现象进行了探讨。

The effect of temperature is not frequently involved in the current mechanism study of wear and calculation theory.A new mechanism of wear is proposed under the consideration of coupling effect between ther-mal stress and circular shear stress.Concretely speaking, the friction heat between metal sliding interfaces is ob-tained according to the rising model and calculation theory of forced vibration of interface atoms, and the distri-bution of temperature of inner body is gained by heat conduction theory, and then the development and distribu-tion pattern of crack is studied.A new delamination theory is put forward, and the physical model and method of calculation are established based on reasonable assumptions.Finally, some typical phenomena are analyzed u-sing the new delamination theory.