METHOD AND DEVICE FOR ESTIMATING FATIGUE LIMIT SURFACE PRESSURE OF LIGHT LOAD CONDITION ROLLING BEARING MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for estimating the fatigue limit surface pressure of a light load condition rolling bearing material capable of precisely estimating the fatigue limit surface pressure of a rolling contact metal material such as rolling bearing steel or the like from the result of a short-term fatigue test.;SOLUTION: The relation between the shearing stress amplitude and load frequency of a metal material becoming the track wheel or rolling body of a rolling bearing used under a condition wherein only stress within an elastic limit acts is calculated by a perfect alternating ultrasonic torsion fatigue test (S1) and the shearing fatigue strength τ_lim in an ultralong life region is determined from the relation between the shearing stress amplitude and the load frequency according to an S-N diagram or the like (S2). The maximum contact surface pressure P_max at the time when the load wherein the maximum alternate stress amplitude τ₀ acting on the inside of the surface layer of the metal material determined from contact dimension data and the load become equal to the shearing fatigue strength τ_lim is set as the estimate value of fatigue limit surface pressure P_maxlim (S3).;COPYRIGHT: (C)2012,JPO&INPIT