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Effect of Non-Conforming Thread Root Radius on the Fatigue Performance of Preloaded Threaded Fasteners

[+] Author Affiliations
Sayed A. Nassar, Brian S. Munn, X. Yang

Oakland University, Rochester, MI

Paper No. PVP2008-61726, pp. 803-809; 7 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4826-5 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by ASME


This paper presents an experimental investigation of the effect of thread root non-conformance on the fatigue performance of preloaded M12×1.5 Class 10.9 fasteners. Thread roots were dimensionally inspected using optical methods in accordance with the DIN 933 specification. Axial load fatigue tests were performed in accordance with ISO 3800. Each bolt specimen was subjected to a fixed stress amplitude of 42 MPa above and below various levels of the mean tensile stress. Test data was analyzed and fracture surfaces were examined using a Scanning Electron Microscope (SEM). Analysis of the test data showed that a non-conforming thread root radius had an adverse effect on the fatigue performance of preloaded threaded fasteners.

Copyright © 2008 by ASME
Topics: Fatigue , Fasteners , Thread



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