Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Structural integrity assessment of NEPE propellant grain considering the tension compression asymmetry of propellant mechanical property
| DOI: | 10.11809/bqzbgcxb2024.04.011 |
| Keywords: | NEPE propellant; tension compression asymmetry; structural integrity; overloads; mechanical response |
| Abstract: | In order to investigate the effect of tension compression asymmetry of propellant mechanical properties on the structural integrity of Nitrate Ester Plasticized Polyether (NEPE) propellant grain, the unified constitutive equations under tension compression was established, a method for grain structural integrity assessment considering tension compression asymmetry was proposed and the structural integrity of NEPE propellant grain under the combined axial and transverse overloads was evaluated. The results indicate that the mechanical state of the NEPE propellant grain is in the coexistence of tension and compression under the combined axial and transverse overloads, and the tension and compression regions in propellant grain is independent of the propellant constitutive behavior; the tension compression asymmetry of the propellant mechanical properties has a certain impact on its mechanical response. The maximum equivalent strain considering the tension compression asymmetry is 1.54, which is between the strain calculated from the tension constitutive equation of 0.193 and the strain calculated from the compression constitutive equation of 0.100, respectively. Considering the tension compression asymmetry, the safety factor is 5.68, which is larger than the safety factor of 1.73 and 4.98 when not considered. The traditional method of structural integrity assessment is conservative. |
| Issue: | Vol. 45 No. 4 (2024) |
| Published: | 2024-04-30 |