Numerical Analysis of Heat Exchange in a Dry Friction Contact between a Pin and a Rotating Cylinder

本资料包含pdf文件1个，下载需要1积分

In industrial machinery, thermal expansion can change the geometry of mechanical components, particularly the operating clearances and the characteristics of materials. This may result in overloading and dangerous tightening. In addition, intense heat flux through thick walls deforms parts and cause thermal stresses. The heat alters also the mechanical and the tribological properties of materials; it lowers their resistance and their modulus of elasticity. These phenomena require the limitation of temperature and heat flow and the dimensioning of the members accordingly. It is therefore of very high importance to determine the temperature field in the interfacial sliding contacts. Since it is difficult to measure these temperatures, it seems important to use developed models with experimental investigations in order to improve the understanding of the phenomena and to determine the temperature distribution in and near the contact zone. The objective of this work is to determine experimentally the temperature at 2 mm from the contact, and then a regression is performed to calculate the coefficients that optimize the temperature corresponding to the interface using a numerical modeling based on the finite volume method. To achieve this, we have considered the solution of a two-dimensional problem given by the equation of heat conduction, in steady state, with a Hertz contact pressure, limited to a circular contact zone of radius a. In addition, in order to control the maximum number of parameters related to the generation of heat by sliding, we used our experimental results which give the evolution of the friction coefficient as a function of load and speed. The values of the latter allow the calculation of the heat flow generated by mechanical friction.