Abstract
In order to study the accelerated aging law of nitrate ester plasticized polyether (NEPE) propellants, the mechanical properties, weight loss, adhesive network structure fracture, and stability of NEPE propellants during storage were analyzed. The results show that the maximum tensile strength σm shows good change law with the increase of storage time, and the failure of NEPE propellants is mainly strength failure. The content of the stabilizer decreased with the increase of storage time. With the prolongation of storage time, the weight loss ratio increases gradually with good regularity. The decomposition of the components in the propellant leads to the degradation of the polyethylene glycol (PEG) network structure. The thermal decomposition of the nitrate plasticizer in NEPE propellants will occur, and the products will cause the adhesive network structure to decompose and break the chain, leading to the destruction of the matrix structure. The thermal decomposition of the propellant has temperature-increasing rate dependency.
Highlights
Solid rocket engines are important defense products, and the health status has a critical impact on weapon reliability
Chemical aging refers to the change in properties of solid propellants caused by chemical changes during processing, storage, and use, such as thermal decomposition, hydrolysis, degradation, decomposition of oxidants, oxidative crosslinking, and degradation of adhesives. e chemical changes caused by the interaction of various components of the propellant or reaction with the air are irreversible, and the rate of change varies with different storage conditions. erefore, the study of the solid propellant aging mechanism is the basis of its storage life assessment and an important issue in the life prediction of solid rocket engines [3,4,5]
It is speculated that the change law of the maximum tensile strength is related to the stabilizer content in the propellant. e initial stage is that the stabilizer is consumed by the nitrate decomposition products
Summary
Solid rocket engines are important defense products, and the health status has a critical impact on weapon reliability. Chemical aging refers to the change in properties of solid propellants caused by chemical changes during processing, storage, and use, such as thermal decomposition, hydrolysis, degradation, decomposition of oxidants, oxidative crosslinking, and degradation of adhesives. Erefore, the study of the solid propellant aging mechanism is the basis of its storage life assessment and an important issue in the life prediction of solid rocket engines [3,4,5]. NEPE combines the advantages of the double-base propellant and composite propellant It is a new type of propellant with excellent energy performance and mechanical properties at present and represents the development direction of high-energy solid propellants [6,7,8]. We analyze the storage performance of NEPE solid propellants, explore the accelerated aging rules of NEPE propellants, and study their health detection technology
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