Structural Engineering and Mechanics

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Numerical model for bolted T-stubs with two bolt rows

  • Daidie, Alain (Toulouse Mechanical Engineering Laboratory, INSA Toulouse) ;
  • Chakhari, Jamel (Toulouse Mechanical Engineering Laboratory, INSA Toulouse, Solid Mechanics, Structures and Technological Developments Laboratory, HSST Tunis) ;
  • Zghal, Ali (Solid Mechanics, Structures and Technological Developments Laboratory, HSST Tunis)
  • Received : 2006.06.12
  • Accepted : 2006.12.04
  • Published : 2007.06.20
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Abstract

This article presents a numerical tool for dimensioning two-threaded fasteners connecting prismatic parts subjected to fatigue tension loads that are coplanar with the screw axis. A simplified numerical model is developed from unidirectional finite elements, modeling the connected parts and screws with bent elements and the elastic contact layer between the parts with springs. An algorithm updating the contact stiffness matrix, calculating forces and displacements at each node of the structure and thus normal stresses in the screws in both static and fatigue is further developed using C language. An experimental study is also conducted in parallel with the numerical approach to validate the developed model assumptions, the numerical model and the 3D finite element results. Since stiffness values for the compressive zones in the parts are analytically difficult to determine, a statistical software method is used, from which a tuning factor is derived for identifying these stiffness values. The method is also applied to set out the influence of each parameter on the fatigue behaviour of each screw. Finally, the developed model will be used to establish a new, sophisticated, fast and accurate tool for dimensioning bolted mechanical structures.

Keywords

References

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