The paper addresses the effect of the external shape of lip-type nuts on the fatigue strength of commercial M10 bolts loaded in tension. Evolving from the standard configuration, six nut geometries are compared, characterized by lips of different shape (cylindrical or tapered) and length. Testing and statistical treatment of the data are performed in accordance with a JSME standard involving 14 specimens for each geometry. Within the class of merely cylindrical lips, only limited advantages over the standard assembly are detected. In particular, the bolt strength remains mostly unaffected by lengthening of the lip beyond one-third of the nut height. Conversely, tapering of the lip end so as to thin its wall around the entry section of the bolt results in substantial improvements. In this case, the strength increase is roughly proportional to the taper length. Adoption of a tapered lip covering two-thirds of the nut height enhances the bolt strength by about one-fourth with respect to the standard geometry.
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August 1995
Research Papers
Fatigue Testing of Metric Bolts Fitted With Lip-Type Nuts
E. Dragoni
E. Dragoni
Department of Mechanics, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy
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E. Dragoni
Department of Mechanics, University of Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy
J. Offshore Mech. Arct. Eng. Aug 1995, 117(3): 200-204 (5 pages)
Published Online: August 1, 1995
Article history
Received:
September 13, 1994
Revised:
February 14, 1995
Online:
December 17, 2007
Citation
Dragoni, E. (August 1, 1995). "Fatigue Testing of Metric Bolts Fitted With Lip-Type Nuts." ASME. J. Offshore Mech. Arct. Eng. August 1995; 117(3): 200–204. https://doi.org/10.1115/1.2827090
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