Long-Term and Short-Term Creep Characteristic Analysis for HTPB Propellant,Propellants, Explosives, Pyrotechnics

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Long-Term and Short-Term Creep Characteristic Analysis for HTPB Propellant
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2022-06-13 , DOI: 10.1002/prep.202200074
Kuangwei Deng _{1,

2} , Haiyang Li _{1,

2} , Jie Xu _{1,

2} , Huiru Cui ₃ , Zhibin Shen _{1,

2}

Affiliation

A solid rocket motor is in storage for most of its life cycle, and propellant creep occurs subjected to gravity load. To analyse the creep characteristics of HTPB propellant during long-term storage, MSC Marc is used to calculate the maximum von Mises stress of the motor under horizontal and vertical storage conditions. Based on the numerical results, the short-term reciprocating creep test and long-term creep test are designed and carried out. The results illustrate that the process of propellant creep from deformation to final failure can be divided into four stages: instantaneous deformation stage, attenuation creep stage, steady-state creep stage and accelerated creep failure stage. When the creep stress level is less than 0.1 MPa, the creep characteristics tend to be stable. When the creep strain exceeds a certain critical value, the propellant will enter the steady-state creep stage. The damage caused by creep rises with the increase of creep time and stress. When the maximum creep strain is less than 10 %, the creep damage can be fully recovered. The splicing curve of short-term creep test data is in good agreement with that of long-term creep test data. A mechanical long-term creep test method is provided, and the parameters of the modified Burgers model are fitted. The text methods and conclusions can provide a reference for the evaluation of structural integrity and storage life of solid motor.

中文翻译：

HTPB推进剂的长期和短期蠕变特性分析

固体火箭发动机在其生命周期的大部分时间里都处于储存状态，并且在重力载荷下会发生推进剂蠕变。为分析HTPB推进剂在长期储存过程中的蠕变特性，采用MSC Marc计算了电机在水平和垂直储存条件下的最大von Mises应力。根据数值结果，设计并进行了短期往复蠕变试验和长期蠕变试验。结果表明，推进剂蠕变从变形到最终破坏的过程可分为瞬时变形阶段、衰减蠕变阶段、稳态蠕变阶段和加速蠕变破坏阶段四个阶段。当蠕变应力水平小于0.1 MPa时，蠕变特性趋于稳定。当蠕变应变超过某个临界值时，推进剂将进入稳态蠕变阶段。蠕变造成的损伤随着蠕变时间和应力的增加而增加。当最大蠕变应变小于10%时，蠕变损伤可以完全恢复。短期蠕变试验数据的拼接曲线与长期蠕变试验数据的拼接曲线吻合较好。提供了一种机械长期蠕变试验方法，并对修正后的Burgers模型参数进行了拟合。文中的方法和结论可为固体电机结构完整性和贮存寿命的评价提供参考。短期蠕变试验数据的拼接曲线与长期蠕变试验数据的拼接曲线吻合较好。提供了一种机械长期蠕变试验方法，并对修正后的Burgers模型参数进行了拟合。文中的方法和结论可为固体电机结构完整性和贮存寿命的评价提供参考。短期蠕变试验数据的拼接曲线与长期蠕变试验数据的拼接曲线吻合较好。提供了一种机械长期蠕变试验方法，并对修正后的Burgers模型参数进行了拟合。文中的方法和结论可为固体电机结构完整性和贮存寿命的评价提供参考。

更新日期：2022-06-13

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