The role of roughness amplitude on depth distribution of contact stresses

7th International Conference on Advanced Concepts in Mechanical Engineering

Tufescu, A.^1 ; Cretu, S.^1 ; Balan, M.R.^1

Mechanical Engineering, Mechatronics and Robotics Department, Gheorghe Asachi Technical University of Iasi, Iasi, Romania^1

关键词: Contacting surfaces;    Depth distribution;    Fatigue limit stress;    Hertzian contacts;    Rolling contact fatigue;    Roughness amplitude;    Semi-analytical methods;    Von Mises equivalent stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012012/pdf
DOI  :  10.1088/1757-899X/147/1/012012

来源: IOP

【 摘 要 】

The normal pressure distribution on contact area and depth distribution of von Mises equivalent stress are of major importance in prediction of various failure phenomena (e.g. rolling contact fatigue, scuffing) of the contacting surfaces. The paper reveals the relationship between roughness amplitude and stress state developed in the loaded material. The study was performed on a double rows spherical roller bearing under three levels of radial loading, and three significant values for the surface roughness. The numerical simulation was used to generate Gaussian rough surfaces with imposed values for Raparameter. A semi-analytical method was used to solve the non-hertzian contact between rough surfaces. For the same loading level, the depth distribution of von Mises stress for rough surfaces is close to the distribution found for smooth surfaces, except the shallow layer close to the contacting surfaces. For medium and especially high loads, the contact between rough surfaces develops, inside this shallow layer, von Mises equivalent stresses higher than the fatigue limit stress.