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前言目前,固体火箭发动机壳体在装药前要进行压力检验,检验压力的水平一般为使用压力,安全系数按1.3—1.5考虑,对壳体来说,检验荷载达到极限荷载的77%—67%理论分析和试验都证明,由于纤维与基体模量差异很大,造成应变集中,纤维增强热固性塑料在低应力下(极限强度的10%)基体会发生开裂.(1)基体开裂的壳体在贮存期间易受温湿的影响,强度和安金系数下降的幅度视环境条
Preface At present, the solid rocket motor housing to be loaded before the pressure test, the test pressure level is generally the use of pressure, safety factor 1.3-1.5 considerations, the shell, the test load reaches the limit load of 77% -67 % Both theoretical analysis and experimental results show that cracking of the matrix occurs at low stress (10% of ultimate strength) in fiber-reinforced thermosets due to the large concentration of fibers and matrix, which causes strain concentration. (1) During storage, it is easily affected by temperature and humidity, and the magnitude of the decrease of the strength and the safety factor depends on the environmental bar