DEVELOPMENT OF A MATHEMATICAL MODEL FOR PREDICTING LIFE OF ROLLING BEARINGS

Abstract

A description of rolling contact failure modes is given and the variables affecting the life of a rolling contact are identified. A mathematical model of subsurface and surface crack propagation is presented. The life to failure of volume elements in the vicinity of a defect is formulated. A term 'severity' of a micro defect has been defined. The model is characterized by the inclusion of bulk material parameters, defect characteristics and parameters of geometry, stress, lubrication and surface topography. A statistical expression for the life of an entire rolling body is based on the defect life formula. The new model includes current standard bearing life prediction formulas as a special case. To assist in interpretation of the model, the stressed volume in a Hertzian elliptical stress field has been determined from the computed contours of equal reversing shear stress. A stress analysis has been conducted on the stresses near interacting asperities and around a surface defect (furrow). (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1968
Accession Number
AD0832929

Entities

People

  • J. A. Martin
  • J. I. Mccool
  • Y. P. Chiu

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Creep
  • Differential Equations
  • Engineering
  • Failure Mode And Effect Analysis
  • Geometry
  • Lepidoptera
  • Materials
  • Mathematical Models
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Deformation
  • Plastic Flow
  • Plastic Properties
  • Pressure Distribution
  • Probability Distributions
  • Slope
  • Stress Strain Relations

Fields of Study

  • Engineering

Readers

  • Computer Science.
  • Materials Science (Mechanical Engineering).
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).