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Stress Concentration at the Root of Bolt Thread Under Twist With Deformable Flanges

[+] Author Affiliations
Yasumasa Shoji

Chiyoda Advanced Solutions Corporation, Yokohama, Japan

Toshiyuki Sawa

Hiroshima University, Hiroshima, Japan

Paper No. PVP2011-57183, pp. 363-368; 6 pages
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 2: Computer Technology and Bolted Joints
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4452-6
  • Copyright © 2011 by ASME


Bolts and Nuts are required to fasten objects, such as flanges in various types of plants. It is known that stress concentration at the root is relevant for its strength for both static integrity and fatigue. A lot of investigations were carried out to understand the behavior of the bolt using experimental and numerical methods. Recently, finite element analyses have been used to examine the detailed behavior of the bolt root successfully. The authors reported such example in a recent study [13] using submodelling (or so-called zooming) technique that handled only bolt tension with rigid fastened surface; some factors were missing. In this paper, the twist of the bolt was taken into account and the fastened object is replaced by deformable plates. The stress concentration factor has been reconsidered.

Copyright © 2011 by ASME



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