ESDU 94034:2010

INTRODUCTION

ESDUpac A9434 provides a FORTRAN 77 computer program for
calculating the stresses in the concentrated point contacts that
occur, for example, in rolling element bearings, gears and cams.
Both normal and combined normal and tangential loading are
allowed.

The program determines the contact dimensions, orientation and
gross deflection (normal closure) from specified radii and other
properties of the two contacting bodies. If, however, the contact
dimensions are already known from a separate analysis these can be
input directly into the program.

The program locates the critical stress points with respect to
three criteria which consider yield failure, brittle failure and
fatigue failure. The program can also produce stress distribution
tables suitable for plotting. The stress distributions can be
constrained to a cross-section through the contact region or to a
line. Stress distributions around the perimeter of the contact area
can also be produced.

The program implements the calculation methods of ESDU 78035
entitled "Contact phenomena. I: stresses, deflections and contact
dimensions for normally-loaded unlubricated elastic components",
ESDU 84017 entitled "Contact phenomena. II: stress fields and
failure criteria in concentrated elastic contacts under combined
normal and tangential loading" and ESDU 85007 entitled "Contact
phenomena. III: calculation of individual stress components in
concentrated elastic contacts under combined normal and tangential
loading". The usual limitations and assumptions of Hertzian theory
apply. In particular, the contacting surfaces are assumed to be
topographically smooth and unlubricated but the results can be
applied with sufficient accuracy to the majority of practical
elastohydrodynamically lubricated contacts. In order to use the
program effectively, ESDU 78035, ESDU 84017 and ESDU 85007 must be
referred to for the theoretical limitations of the method and for
discussion of practical considerations.

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