The stress concentration factor (SCF) for the roots of screw threads in bolted joints under static loadings is analyzed using 3-D elastic FEM taking account the spiral of screw threads. At first, the stress states at the roots of screw threads in initial clamping state in a bolted joint where two hollow cylinders were clamped with a bolt and a nut were analyzed in initial clamping. The elastic FEM result of SCF for the first root was obtained as SCF=3.2. When the bolt was clamped in initial clamping (preload) at the 60 % of bolt yield stress, the plastic deformations were found at the first and the second roots, and non-engaged screw threads. It was found that as the external tensile loads increased, the development in plastic deformation region increased from the first root to the other roots as well as the non-engaged screw threads. It was found that the rupture occurred from the non-engaged screw threaded part while the plastic deformation increased at each root of screw threads. The numerical result was coincided with the experimental result. In the experiments, it was observed that the rupture occurred from the non-engaged screw thread and not from the first root of screw thread. Also, the bolt fatigue was predicted from FEM and it was shown that a fatigue fracture occurred from the first root.
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ASME 2014 International Mechanical Engineering Congress and Exposition
November 14–20, 2014
Montreal, Quebec, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4644-5
PROCEEDINGS PAPER
3-D FEM Stress Analysis of Screw Threads in Bolted Joints Under Static Tensile Loadings
Shunichiro Sawa,
Shunichiro Sawa
Hardlock Industry Co., Ltd., Tokyo, Japan
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Mitsutoshi Ishimura,
Mitsutoshi Ishimura
Shonan Institute of Technology, Fujisawa, Kanagawa, Japan
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Toshiyuki Sawa
Toshiyuki Sawa
Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
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Shunichiro Sawa
Hardlock Industry Co., Ltd., Tokyo, Japan
Mitsutoshi Ishimura
Shonan Institute of Technology, Fujisawa, Kanagawa, Japan
Yuya Omiya
Okayama University, Okayama, Japan
Toshiyuki Sawa
Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan
Paper No:
IMECE2014-38089, V02BT02A007; 8 pages
Published Online:
March 13, 2015
Citation
Sawa, S, Ishimura, M, Omiya, Y, & Sawa, T. "3-D FEM Stress Analysis of Screw Threads in Bolted Joints Under Static Tensile Loadings." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 2B: Advanced Manufacturing. Montreal, Quebec, Canada. November 14–20, 2014. V02BT02A007. ASME. https://doi.org/10.1115/IMECE2014-38089
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