Abstract
The bolted joints are used for flange connections which are subjected to preload forces and dynamic loads. This combination of static and dynamic loads in threaded joints result with complex interaction of high mean stresses, high notch effect, thread flanks contact forces and moments, and contact surfaces slippage which leads to fatigue damage. The Multi-body system dynamic model of shaft was used for assessment of dynamic behavior. Finite element model of shaft flange connection, with detailed thread joints made of heat treatable steel 30CrNiMo8 under preload condition and nonlinear thread flanks contact, was created. The Rainflow cycle counting was used as a cycle count method for describing the load cycle with local stress-strain hysteresis loop. Influences of mean stresses, bolt diameter, and stress gradients were taken into account according to FKM guidelines. The most critical fatigue locations were obtained at thread roots.
Highlights
The bolted joints are tmost common connection type for flange connections in industry
The stress tensors were written only for bolts finite elements from threaded region and close to the bolt head. The reason for such approach was to have a reasonable amount of data and to analyze only most critical areas, because threaded joints are generally known for their high stress concentrations, high stress gradients, and fatigue failures
The results show that the minimal safety factor occur at first engaged thread with value of SFmin = 1.39
Summary
The bolted joints are tmost common connection type for flange connections in industry. Detailed investigation with local approach of stress gradients influence on bolted joint fatigue behavior was recently published [22]. The fatigue analysis of flange bolted joints which are subjected to preload forces and dynamic response was performed. This combination of static preload forces and dynamic response create complex interaction of high mean stresses, high notch effects, and nonlinear contact interactions with slippage of thread flanks. This in turn lead to fatigue damage. Influences of mean stresses, bolt diameter, and stress gradients were taken into account according to the FKM guidelines
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