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Failure Criteria of Three⁃component HTPB Composite Solid Propellant at Low Temperature Under Dynamic
Loading

QIANG Hong⁃fu，WANG Zhe⁃jun，WANG Guang，GENG Biao
（Xi′an Hi‑Tech Institute，Xi′an 710025，China）
Abstract：Based on uniaxial and quasi‑biaxial tensile tests and microscopic damage observation experiments of three‑component

Hydroxyl‑Terminated Polybutadience（HTPB）composite solid propellant at different thermal accelerated aging time（0，32，74，
98 d），temperatures（-50，-40，-30，-20，25 ℃）and strain rates（0.40，4.00，14.29，42.86，63 s ），the effects of loading
-1
conditions on the initial elastic modulus，strength and the corresponding strain have been analyzed. Moreover，failure criteria of
the propellant under the tests have been determined. It has been indicated that HTPB propellant fails more easily due to tensile
stress under dynamic uniaxial loading，and the thermal aging can further reduce this capability. Thus the strain at maximum ten‑
sile stress can be considered as the uniaxial failure criterion. In addition，tensile‑compressive strength ratio can better reflect the
different properties of the propellants under dynamic uniaxial loading. This value is 0.4 and 0.2-0.3 at room temperature and
low temperatures，respectively. The strain at maximum tensile stress of HTPB propellant under quasi‑biaxial tension is significant‑
ly lower than that in uniaxial tension. Furthermore，the extent of reduction increases with extended aging time and decreased
temperature. The proportion for unaged and aged propellants is 60%-85% and 40%-60%，respectively. Finally，this strain is in‑
dependent of stress state and strain rate at the lower temperature and higher strain rates. Thus the strain at maximum tensile stress
under dynamic biaxial tension can be considered as the failure criterion of HTPB propellant. It can also be used to analyze the
structure integrity of propellant grains for tactical missiles during ignition of solid rocket motor（SRM）. Moreover，its value can
be determined with the master curves and aging models.
Key words：Hydroxyl‑Terminated Polybutadience（HTPB）propellant；failure criteria；low temperature；dynamic loading；thermal
accelerated aging
CLC number：TJ55；V512 Document code：A DOI：10.11943/CJEM2018340

（责编：张 琪）

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《含能材料》“含能共晶”征稿

含能共晲是不同含能分子通过氢键等相亏企用力廝成的具暕稳定结曍和弼能的分子晲仺⃪含能共晲充分组合了单
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⃯含能暵料⃰编辑部

CHINESE JOURNAL OF ENERGETIC MATERIALS 含能材料 2019 年 第 27 卷 第 4 期 （274-281）