The Structural Design And Numerical Analysis Of Explosive Bolt With Impaior Slot

The structural design of explosive bolts with impair slot was usually carried out with engineering calculation methods. They were established on the basis of some theoretical models, hypothesis and experiences, so the results were not credible enough and the dynamic action process of explosive blot wasn't gained effectively. In order to understand the action process and to validate the engineering design method, the structural design and action process were researched by engineering design and numerical simulations.With the combination of engineering, the first and third strength theory, and Abel state equation, calculation methods of the explosive bolts' static safety factor, maximum load axial and the charge were explored. The factors, like the structure of explosive blot, chamber volume, environmental pressure and kinetic coefficient, influenced upon static safety factor and charge were researched by the calculation of structural parameters. The results showed that the static safety factor went higher as the decrease of the ratio of inner and outer diameter or environmental pressure. With the increase of chamber volume, the charge increased as linear growth. The charge went higher as the increase of environmental pressure or kinetic factor. The results provided a basis for the design of products.The separation process of explosive bolt with impair slot was simulated with the software of AUTODYN. The reliability of engineering calculation was validated. The results showed that the engineering calculation had an error, and it must be modified. The minimum charge was obtained with dichotomy method. The results showed that the minimum charge of C-4 plastic explosives was 0.372g and the maximum charge of C-4 plastic explosives was 0.471g. By comparing simulation results with engineering calculation results, the correction factor of minimum charge was 0.949 and the correction factor of maximum charge was 0.935. The pressure change and the speed-time curve of bolt body shell and connected body were given out by simulation to a specific size of explosive blot. The revised method was programmed with Visual Basic 6.0. The simplified and visual program provided a reference for product design.