The results of a risk reduction study are presented, proving the suitability of solid rocket motors (SRMs) to de-orbit satellites at the end of their lifetime. In a risk reduction program, three basic unexplored questions regarding this technological approach were investigated: (1) what are the effects of the size and type of particles ejected during the operation of SRMs; (2) what is the effect of the micrometeoroid impact on the solid propellant; and (3) what are the effects of prolonged exposure to space radiation during the 20-year expected satellite lifetime of satellites? Using a series of sophisticated and newly developed research approaches, it was shown that solid rocket propellants can withstand harsh space conditions over an extensive period of time. All of the tests were performed using a well-established, metal-free high-performance ammonium perchlorate/hydroxyl-terminated polybutadiene propellant fully qualified by military standards.


Coping with space environment: testing solid propellants for in-orbit use

Problems which the solid propellant rocket engineer will encounter in designing for long-term storage in a radiation environment are discussed. A summary of present knowledge of the radiation environment is given. Mechanisms of radiation degradation and its effects on tensile properties of propellant binders are discussed qualitatively. Data from a program of irradiation of several propellants is presented. Properties of two of the propellants were changed significantly by doses of the order of 4 x 10(exp 6) rads.

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Effects of Ionizing Radiation on Solid Rocket Motor Components

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Effects of Ionizing Radiation on Solid Rocket Motor Components