A three-dimensional nonlinear finite element model is developed for achieving a uniform clamp load in gasketed bolted joints. The model is used for both multiple and single pass tightening patterns. Geometric nonlinearity of the gasket is taken into account and plastic model parameters are experimentally determined. The effect of the tightening pattern, gasket loading and unloading history, and the preload level is investigated. The validity of the FEA methodology is experimentally verified. This study helps improve the reliability of gasketed bolted joints by minimizing the bolt-to-bolt clamp load variation caused by elastic interaction among the various bolts in the joint during initial joint-bolt-up.

Issue Section:
Design and Analysis
Keywords:
couplings, fasteners, finite element analysis, plasticity, reliability, elastic interaction, multipass tightening, single-pass tightening, gasketed flange
Topics:
Finite element analysis, Finite element model, Gaskets, Stress, Tension, Bolted joints, Electromagnetic scattering, Clamps (Tools), Simulation
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