Evaluation of Contact Stress and Fracture Parameters

  • K. Ramesh


In many mechanical devices, there exist contact between two or more parts such as in gears, rolling element bearings, locomotive wheels and rails etc. The stresses caused by the pressure distribution between the bodies in contact are of importance in the design of these parts. Hertz [1] pointed out that in the absence of friction, the maximum shear stress occurs beneath the surface of contacting bodies. This leads to pitting of the contacting surfaces. The material lost from the surface due to pitting may get trapped into the contacting surfaces, causing abrasive wear. Smith and Liu [2] studied the effect of friction between the contacting surfaces. They reported that under certain conditions, the point of maximum shear stress could also occur at the surface of contacting bodies. The knowledge of contact zone and coefficient of friction between the contacting bodies is essential for evaluating the design of such contacting elements.


Stress Intensity Factor Contact Stress Stress Intensity Factor Fringe Pattern Fracture Parameter 
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© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • K. Ramesh
    • 1
  1. 1.Department of Mechanical EngineeringIndian Institute of TechnologyKanpurIndia

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