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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.2; 20051026-28; Nanjing(CN) >Restoration of Large Solid Rocket Motor Propellant Grains
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Restoration of Large Solid Rocket Motor Propellant Grains

机译：大型固体火箭发动机推进剂颗粒的修复

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摘要

Mechanical properties of composite solid propellants, used in rocket motors, constantly change during service life. For that reason service life needs to be constantly reviewed and extended based on the current properties. Lifetime extension requires available safety margins to be enhanced in order to use the products up to their maximum possible extent. During reliving inspections, small and low cost items such as rubber seals, screws, igniters and even small auxiliary motors can economically be replaced with new ones. But in large rocket motors the most important and expensive part is the propellant grain which is also aged. It is not economical to replace the main propellant charge especially for case bonded grains. In case bonded grains, bore surface cracks and bondline system failure are the primary outcomes of grain's aging. Although the general features of aging process are common knowledge, little information is available to enable its importance in reliving of a composite motor charge. The aging behaviour of the composite propellant charge is presented in light of experimental studies identifying prime factors responsible for aging of Polybutadiene based composite propellants. Based on the experimental studies a practical method of grain trimming and cast on cast technique to enhance the life of the large propellant grains is presented. Finally to verify the effectiveness of the grain restoration method, the grain was analyzed by finite element technique which showed that the life as well as the safety margins is efficiently enhanced. This kind of technique can be employed to enhance the life of current stock of large rocket motors which are running out of age. At the same time this approach can be used in designing new rocket motors characterized by longer service life. Consequently the military user will get benefit from a more extendable life span, thereby improving reliability as well as life cycle cost.
机译：用于火箭发动机的复合固体推进剂的机械性能在使用寿命期间不断变化。因此，需要根据当前属性不断检查和延长使用寿命。延长使用寿命需要提高可用的安全裕度，以便最大程度地使用产品。在进行重新检查时，可以经济地用新的零件代替小型且低成本的零件，例如橡胶密封件，螺钉，点火器，甚至小型辅助电动机。但是在大型火箭发动机中，最重要和最昂贵的部分是还老化的推进剂颗粒。更换主推进剂装药是不经济的，特别是对于表壳粘结谷物。如果是粘结晶粒，则孔表面裂纹和粘结层系统故障是晶粒老化的主要结果。尽管老化过程的一般特征是众所周知的，但很少有信息可用来说明其在减少复合电动机装料中的重要性。根据实验研究确定了复合推进剂装药的老化行为，这些实验确定了引起聚丁二烯基复合推进剂老化的主要因素。在实验研究的基础上，提出了一种实用的晶粒修整和浇铸技术，以提高大型推进剂晶粒的寿命。最后通过有限元技术对谷物进行了分析，以验证该谷物修复方法的有效性，结果表明该谷物的寿命和安全裕度得到了有效提高。可以使用这种技术来延长已过期的大型火箭发动机的现有库存寿命。同时，该方法可用于设计使用寿命更长的新型火箭发动机。因此，军事用户将从更长的使用寿命中受益，从而提高可靠性以及生命周期成本。

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