Chapter

CONTACT STRESS, RESIDUAL STRESS AND STRESS CONCENTRATIONS

Summary

The maximum pressure po or compressive stress oc at the centre of contact between two curved surfaces is:

- 3P c 2nab where a and b are the major and minor axes of the Hertzian contact ellipse and P is the total load.

For contacting parallel cylinders of length L and radii R\ and R2, maximum compressive stress, oc = —0.59M

and the maximum shear stress, rmax = 0.295po at a depth of 0.786fc beneath the surface, with: contact width, b = 1.076

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