Effect of High Acceleration Load on Delay Performance of Boron Base Pyrotechnic Composite
|School||Nanjing University of Technology and Engineering|
|Course||Military chemistry and pyrotechnics|
|Keywords||Boron base composition Delay element Delay time Burning rate, High acceleration Hopkinson bar ANSYS/LS-DYNA|
The burning performance of boron base composite after loaded by the way of shock wave was studied in this paper, in which the delay time and the precision of the composite were compared before and after shock. An improved Hopkinson pressure bar technique was used to come into being the shock load on boron base composite pressed in the delay element, and the stress with the load was obtained after dealing with the electricity signal. The delay time and the burning rate were obtained by optical fibers. ANSYS/LS-DYNA was also used to simulate the delay element under the overload and get the stress and the overload.Tested results shown that :(1) The influence of the shock load on the delay time and the precision of burning rate is different for delay composite with different press at the same condition. (2)The precision of burning rate can be declined after loaded at high acceleration (60000g) for the same delay composite. (3) The overload performance will be improved after mixing binder in composite.From the simulation by the FEA software ANSYS/LS-DYNA, it is found that the stress on the boron base composition is much smaller than that on the outside. The stress from the input bar was absorbed by the metal shell.