Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Drop hammer impact test and ignition response simulation of HTPB composite solid propellant tablets
| DOI: | 10.11809/bqzbgcxb2024.05.003 |
| Keywords: | HTPB composite solid propellant; low speed impact; drop hammer impact; ignition response; numerical simulation |
| Abstract: | HTPB composite solid propellant may ignite unexpectedly under the action of low amplitude and long pulse pressure, and then develop into combustion or detonation, leading to serious consequences. In order to study the force state and ignition mechanism of HTPB composite solid propellant tablets under impact, an impact force testing system using the Caster drop hammer instrument was established, and the characteristic drop height values of propellant tablets under impact and the drop hammer impact load curves of the tablets at different heights were obtained. Based on the modeling of a drop hammer impact tester, the drop hammer impact ignition test of propellant tablets was numerically simulated. The research results indicate that the characteristic drop height H 50 of the tablet under a 2 kg drop hammer is 29.5 cm, and the surface of the tablet is subjected to a peak impact force of 36.9 kN and an action time of 0.40 ms; The numerical simulation results show that the characteristic drop height of the ignition of the tablet is between 28 cm and 30 cm, which is consistent with the experimental results; Under the condition of local stress concentration on the surface of the tablets, HTPB binder generates plastic flow and friction, heating the tablets until thermally decomposed AP undergoes ignition response. Through simulation calculation, the peak pressure for ignition of a 2 kg drop hammer impact tablet was 470.9 MPa, and the ignition time was approximately 0.30 ms. |
| Published: | 2024-05-31 |