Pressure Distribution in the Area Around a Tightened Single Bolt Joint

When modelling the dynamic behavior of machines and devices, it is necessary to take into account not only the configuration of the parts but also the way the parts are joined. As the contact surfaces are not topologically ideal, the joint has some pliability that depends on the contact pressure. Detailed modelling of the surfaces of the contact parts is not possible as it involves high computational costs. Due to this, a method where a contact layer is modelled as a third body of zero thickness has become widespread. Thus, the pressure distribution in the contact must be known for accurate simulation. A technique based on the finite element method is proposed for determining the contact pressure in the vicinity of a tightened single-bolt joint. The proposed technique involves adding interface elements into the finite element mesh that model the zero-thickness pliable contact layer and take into account the roughness of the contact surfaces. Equations for solving the axisymmetric contact problem with a nonlinear interface element are derived. As a result, relations describing the contact pressure distribution in the vicinity of the single-bolt joint are obtained for various parameters of the roughness and thickness of the connecting parts.

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