Parametric study on stressed volume and its application to the quantification of rolling contact fatigue performance of heterogeneous material.pdfVIP

Tribology International 107 (2017) 221–232 Contents lists available at ScienceDirect Tribology International journal homepage: /locate/triboint Parametric study on stressed volume and its application to the quanti?cation of rolling contact fatigue performance of heterogeneous material Wanyou Yanga, Yanyan Huanga, Qinghua Zhoua,c,?, Jiaxu Wanga,b, Xiaoqing Jinb, Leon M. Keerc a School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China b State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400030, China c Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA MARK ARTICLE INFO Keywords: Stressed volume Rolling contact fatigue Distributed inhomogeneities Surface asperity Volumetric stress integral ABSTRACT This research explores the in?uence of distributed inhomogeneities and surface asperities on the stressed volume of heterogeneous material in contact with a sphere. The recently developed modeling method for solving rough-surface contact problems involving distributed inhomogeneities, incorporated with FFT algorithms and a mesh di?erential re?nement scheme, is utilized. The e?ective stressed volume, quantitatively described by e?ective depth, length and width, is investigated to characterize the rolling-contact-fatigue in?uence zone in heterogeneous material. Furthermore, a parametric study is conducted for the in?uences of inhomogeneity distribution and surface roughness on volumetric stress integral in order to understand the rolling contact fatigue performance of particle-laden inhomogeneous materials. 1. Introduction Rotating mechanical components, such as bearings, are widely used in mechanical transmission systems to allow rotary motion and support signi?cant cyclic load. Rolling contact fatigue (RCF) is a main failure mode for bearings and other rotating mechanical components. Many RCF empirical and analytical models have been developed and proposed over the past few decades [1