Application of Fatigue Strength Reduction Factor in the Design of Fatigue Pressure Vessel
The analytical design method is one of the main methods in pressure vessel design.JB4732 has clear requirements that the fatigue reduction of stress concentration shall be considered.In the analysis and design process,the stress concentration occurs in the discontinuous area of the structure,such as fillet weld,opening area,thickness mutation area,etc.Standard fatigue evaluations of vessels are based on peak stresses,but stress anomalies in the discontinuity region are sometimes difficult to avoid,where the peak stresses cannot be resolved by convergence,making it difficult to pass fatigue evaluations here.In this case three methods are explained in this article,using ANSYS to evaluate the fatigue intensity by fatigue strength reduction factor of the fillet welding,then we compare it with its convergence solution.The results shows that it was conservative and feasible to evaluate the fatigue strength according to the fatigue strength reduction factor by rules.
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