Abstract
Scanning electron microscope(SEM)has been employed to observe the tensile fracture surfaces of aged hydroxyl-terminated polybutadiene(HTPB)propellant at low temperatures under dynamic loading.The microscopic damage of the propellant under the testing conditions has been analyzed.Fractal dimension was applied to further quantitatively investigate the effects of loading conditions on the damage of HTPB propellant.The results indicate that the microscopic damage of aged HTPB propellant at low temperatures under dynamic loading is more complicated and severe than that without aging.Moreover,the temperature,strain rate and thermal aging all can change the fracture mechanisms of HTPB propellant.There is a critical loading condition for this change. Finally, the value of fractal box dimension is about 1.866,which does not change any more with the coupled effects of continuously decreasing temperature,increases of strain rate and aging time.It indicates that the microscopic damage of HTPB propellant is not sensitive to the loading conditions.This study provides a certain reference value to analyze the propellant grain structural integrity of solid rocket motor(SRM)for the tactical missiles during ignition at low temperatures.
| Translated title of the contribution | Microscopic damage of aged HTPB propellant at low temperatures under dynamic loading |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 72-77 |
| Number of pages | 6 |
| Journal | Guti Huojian Jishu/Journal of Solid Rocket Technology |
| Volume | 42 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Feb 2019 |