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|All Authors / Contributors:||
Manuel Martinez-Martinez; Jean Guillot; Institut national des sciences appliquées (Toulouse).
|Notes:||Thèse : 2002ISAT0016.|
|Description:||II-164 p. : ill. ; 30 cm.|
|Responsibility:||par Manuel Martinez-Martinez ; sous la dir. de Jean Guillot.|
This thesis deals with the behaviour of threaded assemblies and the implementation of an accurate analytic equation to dimensioning those assemblies. We are interested particularly in bolted and tapped parts assemblies. We analyse the thread stripping behaviour of a static loaded assembly by modelling non linear finite elements and a failure criterion by damage. This model enables us to study the different parameters likely to influence the behaviour of this bolted connection. We have concentrated on the influence of pairs of materials constituting the connection and the geometrical characteristics of the bolt and the tapped part. An experiments design method has been established to discover the most significant parameters and to propose a simple expression for the calculation of thread resistance regardless of the metal materials of the bolt and the tapped part. We have carried out stripping tests in order to validate our model. The estimated results are very close to those obtained by the tests. Finally, we studied the threaded assembly under dynamic loading. We propose two methods to optimise the engagement length. The first one, uses the finite elements method coupled to a rupture criterion by fatigue damage. The second one, uses stress concentrations factors specific to thread stripping obtained by finite elements. These methods were verified to some particulars cases and they could arrive to be the simples laws of threads dimension optimisation under fatigue load.
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