GSD-12 OBSERVATION OF CRACK PROPAGATION BEHAVIOR IN STEEL ROLLER UNDER SLIDING-ROLLING CONTACT FOR EVALUATING ITS FATIGUE LIFE(GEAR STRENGTH AND DURABILITY)

概要

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In order to assess the sliding-rolling contact fatigue lives of surface-hardened sintered rollers from the view point of linear fracture mechanics, the crack propagation behavior was investigated under a sliding-rolling contact condition. The surface-hardened rollers which have three kinds of artificial defects were fatigue tested, and the crack propagation rate was measured. The stress intensity factor was calculated using the finite element method. The crack propagated from the hole was almost parallel to the roller surface. Therefore, it could be said that the crack propagation under a sliding-rolling contact condition was in the mode II. The parameters m and C in Paris's law were obtained from this experiment. Using those parameters, the fatigue lives of the surface hardened sintered roller were estimated. The estimated fatigue lives were almost the same as the experimental ones. The fatigue lives of the sintered rollers depend mainly on the pore distribution and the hardness. It could be considered that the cracks of the sintered rollers occurred from many mean pores and propagated from one pore to another pore.
一般社団法人日本機械学会の論文
2001-11-15