Analysis on Structural Integrity of Deep Debonding Integrated Propellant Column at Low Temperature

FANG Bing; LI Shasha; ZHAN Dongzhi; ZHENG Qing

doi:10.15892/j.cnki.djzdxb.2025.03.016

Journal of Projectiles, Rockets, Missiles and Guidance >

2025 , Vol. 45 >Issue 3: 380 - 385

DOI: https://doi.org/10.15892/j.cnki.djzdxb.2025.03.016

Analysis on Structural Integrity of Deep Debonding Integrated Propellant Column at Low Temperature

FANG Bing ,
LI Shasha ,
ZHAN Dongzhi ,
ZHENG Qing

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Shanghai Aerospace Power Technology Research Institute, Shanghai 201109, China

Received date: 2024-11-03

Online published: 2025-07-09

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Abstract

Deep debonding integrated propellant column is a high loading grain suitable for small opening & non-segmented shell single chamber dual thrust engines. In order to conduct a safety assessment of the engine in low-temperature ignition, this article conducted simulation analysis on the integrity of the low-temperature structure of the propellant column based on a finite element model, and studied the influence of the pressure difference between the inner hole and gap of the column on the integrity of the charge structure during low-temperature ignition process. The pressure distribution inside the gap during the ignition process was tested by a simulated engine. The results indicate that the pressure difference between the inside and outside of the propellant has a significant impact on the stress and strain distribution of the grain during low-temperature ignition process. Through experiments, it was found that under low-temperature ignition conditions, the pressure building rate at the tail of the gap is synchronized with the combustion chamber whose max pressure is only 4% lower, while the pressure building in the middle of the gap is delayed obviously, and the maximum pressure difference is about 64% of the combustion chamber. The calculated comprehensive safety factor of the column at low temperature reaches 1.76 indicating high safety and reliability of low-temperature ignition.

Key words： solid rocket motor; deep debonding integrative grain; structural integrity; comprehensive safety factor

Cite this article

FANG Bing , LI Shasha , ZHAN Dongzhi , ZHENG Qing . Analysis on Structural Integrity of Deep Debonding Integrated Propellant Column at Low Temperature[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2025 , 45(3) : 380 -385 . DOI: 10.15892/j.cnki.djzdxb.2025.03.016

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