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Finite Element Analysis and Test of a Sharp Radius on the Shank of a Ring Locked Stud

Lin Liu, David Binney, Sikorsky a Lockheed Martin Company

https://doi.org/10.4050/F-0079-2023-18161

Abstract:
This paper is an expansion on a prior paper in which the authors detailed an analytical approach to determining the effect of a sharp radius on the fatigue life of a ring locked stud. Fatigue testing of several studs has since been completed and the test results are compared with analytical predictions. Using the stresses determined by a validated finite element (FE) model, three methods of life calculation, stress life, strain life, and the theory of critical distances (TCD) point method, are evaluated in light of the test results. The stress life method is found to be inapplicable since there is no reliable Kf data for the high Kt levels in question. Strain life results are conservative relative to the test. The TCD may provide more accurate life results without the conservatism of strain life, but current test results do not support its use. The idea that small non-propagating cracks may exist at the sharp radius, below some threshold of alternating stress, is also discussed. In addition, the test program revealed that the installation depth of studs can potentially affect their fatigue strength.


Finite Element Analysis and Test of a Sharp Radius on the Shank of a Ring Locked Stud

  • Presented at Forum 79
  • 11 pages
  • SKU # : F-0079-2023-18161
  • Structures and Materials

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Finite Element Analysis and Test of a Sharp Radius on the Shank of a Ring Locked Stud

Authors / Details:
Lin Liu, David Binney, Sikorsky a Lockheed Martin Company