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| Quantitative Characterization of Damage Evolution for Aged Composite Solid Propellant under Tensile Loading |
| Received:March 28, 2024 Revised:April 17, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.04.001 |
| KeyWord:composite solid propellant aging tensile loading damage evolution quantitative analysis micro-CT |
| Author | Institution |
| LIU Xinguo |
Rocket Force University of Engineering, Xi¢an , China |
| WANG Zhejun |
Rocket Force University of Engineering, Xi¢an , China |
| HAN Yongheng |
Military Representative Bureau of Naval Armament Department in Beijing Region, Beijing , China |
| CHEN Jiaxing |
Inner Mongolia Institute of Dynamical Machinery, Hohhot , China |
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| Abstract: |
| The work aims to quantitatively analyze the effect of aging on the microscopic damage evolution of composite solid propellant under tensile loading. Thermal accelerated aging tests on three component hydroxyterminated polybutadiene (HTPB) composite solid propellants at different aging times (0, 32, 74, and 98 days) and micro-CT scanning observation tests on small dumbbell shaped sample of aged propellant at different tensile strain levels (0, 5%, 10%, 20%, 40% and 50%) were conducted. Then, the scanning reconstructed images were quantitatively analyzed to obtain the effect of aging on the microscopic damage evolution law of the propellant. As the tensile strain increased, all the gray level mean square deviation, average porosity and fractal dimension of the micro-CT images for the unaged and aged propellant showed a non-linear increasing trend, while the gray level mean value of the images showed a non-linear decreasing trend. At lower strain levels (<10%), the above parameters were not significantly affected by aging time, but at the higher tensile strain (≥10%) and longer aging time, all the values of the gray level mean square deviation, average porosity and fractal dimension increased, while the gray level mean value decreased with aging time. Moreover, there was a positive linear relationship between fractal dimension and average porosity at different aging times. The gray level mean value, average porosity and fractal dimension of the reconstructed micro-CT images can be selected as the characterization parameter to quantitatively analyze the micro damage and dynamic evolution of aged composite solid propellant under tensile load. The initial damage and damage degree of HTPB propellant under small strain are weakly affected by aging, while the effect of aging time on the micro damage of the propellant is more significant at higher strain levels. |
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