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Principal Stress Model for Multi-Axial Fatigue of Preloaded Threaded Fasteners

[+] Author Affiliations
Amir Kazemi, Sayed A. Nassar, Zhijun Wu

Oakland University, Rochester, MI

Paper No. IMECE2016-66266, pp. V002T02A078; 9 pages
doi:10.1115/IMECE2016-66266
From:
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 2: Advanced Manufacturing
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5052-7
  • Copyright © 2016 by ASME

abstract

A principal stress-based high cycle fatigue (HCF) model is proposed for cyclic multiaxial stresses in threaded fasteners under tensile-shear loading. The proposed model uses the fastener principle stress amplitude in order to construct mean-stress adjusted S-N curves for multi-axial stresses. Experimental validation is provided using an MTS fatigue testing system, with a special fixture that would allow combined cyclic tensile-shear loading of the fastener at various angles relative to the axis of the MTS grip axis. Experimentally validated multiaxial fatigue model is compared to classical uniaxial S-N curves. Detailed discussion of the model results is provided.

Copyright © 2016 by ASME
Topics: Fatigue , Stress , Fasteners

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