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针对推进剂药柱材料线胀系数大、应变大,传统的电测技术测量其表面应变时“死片”率高的问题,该文采用近似将应变片植入推进剂装药的粘贴技术,建立了一种改进的测量改性双基推进剂药柱表面应变的电测法。应用该法测量了单孔推进剂药柱在静载荷和冲击载荷作用下的应变响应过程,分析了推进剂材料的延滞回复现象。结果表明:该方法可以准确地测量药柱的的静态、准静态及动态应变等粘弹性力学特征,适于固体火箭发动机推进剂药柱的结构完整性研究。
Aiming at the problem of high linear expansion coefficient and large strain of the propellant grains, the traditional method of measuring the surface strain of “propellant grains” Technology, an improved electrical measurement method for measuring the surface strain of modified double-base propellant grains was established. The method was used to measure the strain response of single-hole propellant grains under static load and impact load. The delayed recovery phenomenon of propellant materials was analyzed. The results show that the method can accurately measure the viscoelastic mechanical properties such as static, quasi-static and dynamic strain, and is suitable for the structural integrity study of solid rocket motor propellant grains.