Effect of Notch Structure and Notch Bottom Diameter on the Tensile Load of a Certain GH4169 Notch Bolt for a Device for Longitudinal Separation of Fairing

The effect of the notch structure and bottom diameter of a GH4169 notch bolt for an explosive separation device used for longitudinal separation of the fairing, and GH4169 strength range on the tensile load was studied by combing simulations with tests. The results show that the V-shaped, arc-shaped and square notch structures can improve the tensile load of the bolt but to a lesser degree in sequence, and the arc-shaped notch structure performs best in terms of tensile load, fracture appearance and shear resistance. In order to meet the design requirements of 14–15.5 KN tensile load for the notch bolt with an arc-shaped structure, four raw material tensile intervals corresponding to the notch bottom diameters were established by using domestic GH4169 grade C cold-drawn bars.