Failure Analysis of Rolling Bearings Based on Explicit Dynamic Method and Theories of Hertzian Contact
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TECHNICAL ARTICLE—PEER-REVIEWED
Failure Analysis of Rolling Bearings Based on Explicit Dynamic Method and Theories of Hertzian Contact Qifeng Gao . Xiongxi Wu . Zesong Li
Submitted: 17 November 2018 ASM International 2019
Abstract Bearing failure is one of the most important factors influencing performance, accuracy and reliability of rotating machineries. Bearing faults are commonly shown as the defects such as rolling body fracture, rolling body, and surface pitting, etc. Dynamic model of 6206 deep groove ball bearing with the above-mentioned bearing faults has been established by finite element method. Exponent Hardening Plasticity Cowper Symonds model related to strength and hardening coefficients is adopted for describing elastoplastic material model of rolling body. The smaller difference between simulated results obtained by EDM and theoretical results calculated by Hertzian point contact theory validates the reliability of explicit dynamic model established in this paper. Dynamic contact characteristics of rolling bearing with different faults such as rolling body fracture, rolling body peeling, and bearing pitting are investigated using explicit dynamic model above. By comparing contact characteristics of fault bearing with those of fault-free bearing, it provides a reference for fault diagnosis and failure prevention of rolling bearing. Keywords Bearing fault Hertzian point contact Contact characteristics Explicit dynamic Fault diagnosis
Q. Gao (&) X. Wu Zhejiang Industry Polytechnic College, Shaoxing, China e-mail: [email protected]
List of DOF EHP FEM EDM at vt xt M C K Qt Dt a b Rq F(q) v 1, v 2 E1, E2 a*, b* rmax Qn e9 c, p eeff p ee m n
Symbols Degree of freedom Exponent hardening plasticity Finite element method Explicit dynamic method Acceleration vector Velocity vector Displacement vector Mass matrix Damping matrix Stiffness matrix Loading matrix Time step Semi-axis of Hertzian contact area in rolling direction Semi-axis of Hertzian contact area in rolling direction perpendicular to rolling Sum of curvature Function of curvature difference Poisson’s ratio Elastic modulus Dimensionless quantities related to F(q) Maximum stress Normal loading Strain rate Parameters of Cowper–Symonds strain rate Effective plastic strain Elastic strain Strength coefficient Hardening coefficient
Z. Li College of Control Science and Engineering, Zhejiang University, Hangzhou, China
123
J Fail. Anal. and Preven.
Introduction As the most important parts of transmitting motion and bearing loads in rotating machineries, rolling bearings are of small frictional resistance, fast starting velocity, high transferring power efficiency, more convenient lubrication and maintenance, and have been widely used in the automotive industry, textile machineries, precision instruments, machine tools, robotics, aerospace and other important areas [1]. With the increasingly high demanding of performance, accuracy and reliability for rotating machineries, high-quality requirements of rolling bearings have been more and
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