Accession Number:

AD0832929

Title:

DEVELOPMENT OF A MATHEMATICAL MODEL FOR PREDICTING LIFE OF ROLLING BEARINGS

Descriptive Note:

Final rept. 22 Dec 1966-22 Dec 1967

Corporate Author:

SKF INDUSTRIES INC KING OF PRUSSIA PA RESEARCH LAB

Personal Author(s):

• Chiu, Y. P.
• Martin, J. A.
• McCool, J. I.

Report Date:

1968-04-01

Pagination or Media Count:

159.0

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

Descriptors:

• *ROLLER BEARINGS
• STRESSES
• MATHEMATICAL MODELS
• CRACK PROPAGATION
• DEFECTS(MATERIALS)
• MATHEMATICAL PREDICTION
• MATHEMATICAL ANALYSIS
• SHEAR STRESSES
• FATIGUE(MECHANICS)
• STATISTICAL ANALYSIS
• FAILURE(MECHANICS)
• LUBRICATION

Subject Categories:

• Manufacturing and Industrial Engineering and Control of Production Systems
• Machinery and Tools
• Air Breathing Engines (Unconventional)

Distribution Statement:

APPROVED FOR PUBLIC RELEASE