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采用单向拉伸实验,研究了不同温度、不同拉速、不同环境压强对NEPE推进剂力学行为的影响。结果表明,环境压强对NEPE推进剂力学行为的影响存在一个阈值,超过该阈值后,环境压强对最大强度的影响不大,对最大伸长率无明显影响规律。同时,采用双剪强度理论,建立了NEPE推进剂最大剪应力强度与环境压强的关系。结果表明,两者呈现较好的线性关系,根据关系式得出,在低温下推进剂最大剪应力强度对环境压强更敏感,并对该关系式的其他应用进行了简要分析。采用SEM法观测结果表明,环境压强主要在抑制颗粒脱湿、降低空穴方面有较强作用。
Uniaxial tensile test was used to study the influence of different temperature, different drawing speed and different ambient pressure on the mechanical behavior of NEPE propellant. The results show that there is a threshold for the effect of ambient pressure on the mechanical behavior of NEPE propellant. After this threshold is reached, the effect of ambient pressure on maximum strength is not significant, and the law of maximum elongation is not affected significantly. At the same time, the relationship between the maximum shear stress of NEPE propellant and the pressure of the environment was established by using the theory of double shear strength. The results show that the two show a good linear relationship. According to the relation, the maximum shear stress intensity of propellants is more sensitive to the environmental pressure at low temperature, and the other applications of the relationship are analyzed briefly. The results of SEM observations show that the environmental pressure is mainly in inhibiting particle dehumidification, reduce the hole has a strong role.