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Structural Engineering and Mechanics
  Volume 26, Number 3, June20 2007 , pages 343-361
DOI: https://doi.org/10.12989/sem.2007.26.3.343
 


Numerical model for bolted T-stubs with two bolt rows
Alain Daidie, Jamel Chakhari and Ali Zghal

 
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.
 
Key Words
    bolted connections; numerical modeling; finite elements; structures.
 
Address
Alain Daidie: Toulouse Mechanical Engineering Laboratory, INSA Toulouse, France
Jamel Chakhari: Toulouse Mechanical Engineering Laboratory, INSA Toulouse, France
Solid Mechanics, Structures and Technological Developments Laboratory, HSST Tunis, Tunisia
Ali Zghal: Solid Mechanics, Structures and Technological Developments Laboratory, HSST Tunis, Tunisia
 

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