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An experimental validation of load distribution in screw threads

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Abstract

The thread load distribution has been examined, as is known, in literature both theoretically and experimentally. in the present paper the load distribution is validated by strain-gage measurements. Starting from the theoretical load distribution the stresses on the outer surface of the female member of a threaded connection are calculated. The theoretical and experimental stress values obtained are reasonably close.

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Abbreviations

D e :

outside diameter of female screw

D m :

mean diameter of thread

D mw :

mean diameter of female screw wall

E :

Young’s modulus

F :

total axial load on connection

F k :

axial load onk thread turn (the engaged thread turns are numbered starting from the unthreaded part of male screw)

l :

pitch of thread

M ok :

bending moment per unit length

n :

total number of ungaged thread turns

P k :

radial load per unit length

u :

radial displacement for threaded element bodies

U k ,W k :

radial and axial displacements evaluated onD m diameter circumference of the active flank ofk thread turn, considered as a cylindrical collar perfectly clamped at its base

γ:

semi-angle of thread

Δl i :

pitch variation betweeni andi+1 thread turns

\(\varepsilon _x , \varepsilon _\theta\) :

axial and tangential unit elongation of the body

\(\sigma _z , \sigma _r , \sigma _\theta\) :

normal component of stress in the axial radial and tangential direction

′:

male screw

″:

female screw

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Authors and Affiliations

  1. Department of Industrial Engineering, University of Cassino, Via Zamosch 43, 03043, Cassino, Italy

    M. D’Eramo (Professor)

  2. Department of Mechanics and Aeronautics, University of Rome “La Sapienza”, Via Eudossiana 18, 00184, Rome, Italy

    P. Cappa (Assistant Professor)

Authors
  1. M. D’Eramo
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  2. P. Cappa
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D’Eramo, M., Cappa, P. An experimental validation of load distribution in screw threads. Experimental Mechanics 31, 70–75 (1991). https://doi.org/10.1007/BF02325727

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  • DOI: https://doi.org/10.1007/BF02325727

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