组合载荷作用下平盖双开孔接管结构强度性能分析

The flat head double flat-nozzle intersection under combined loadings was analyzed with finite element analysis method and the strength of the double open hole structure under four working conditions was evaluated. The evaluation results show that stress values meet the requirements and have a great safety margin under four working conditions. Moreover, the stress distribution of flat head double flat-nozzle intersection under different combination loads was analyzed in detail. The results show that the increase of axial thrust force F₁ can improve the bearing capacity of the structure when the axial thrust force F₁ is less than 15 kN. However, the increase of axial thrust force F₁ decreases the bearing capacity of the structure when the axial thrust force F₁ is more than 15 kN. The axial tension force F₂ always increases the overall structural stress and significantly decreases the bearing capacity of the flat head double flat-nozzle intersection.