Experimental Mechanics

, Volume 31, Issue 2, pp 144–149 | Cite as

A photoelastic study of friction at multipoint contacts

  • J. W. Dally
  • Y. -M. Chen


A new method of measuring the normal and sliding loads associated with multiple-point contact is introduced. A multiple-point contact is modeled with a steel die with a profile that simulates a rough surface. A very large scale factor is used in modeling this surface. The steel die is placed in contact with a photoelastic model of a half plane and is subjected to a normal load. This normal load is partitioned over the multiple points of contact producing an isochromatic fringe pattern that describes the stress distribution in the local neighborhood of the contact points. A sliding load is then imposed on the model which destroys the symmetry of this fringe pattern. The fringe data in this pattern are sufficient to determine the local loadsP i andQ i and the local coefficient of frictionf i =Q i /P i at each contact point. An overdeterministic method is introduced which gives the solution forP i ,Q i andf i using many data points taken from the isochromatic pattern in the local neighborhood of the contacts.


Rough Surface Fluid Dynamics Stress Distribution Contact Point Normal Load 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Society for Experimental Mechanics, Inc. 1991

Authors and Affiliations

  • J. W. Dally
    • 1
  • Y. -M. Chen
    • 1
  1. 1.Mechanical Engineering DepartmentUniversity of MarylandCollege Park

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