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Composite propellant must possess sufficient structural capability to withstand the various loading conditions. Several attempts are made worldwide to evaluate mechanical properties of composite propellant at different temperatures and strain rates but effect of pressure has not been yet fully elaborated. In the present study, effect of pressure on mechanical properties of composite propellant was evaluated and discussed to obtain the best possible simulation of firing phenomena. The Universal Testing Machine (UTM) was used to characterize the mechanical behavior of AP/ Al/ HTPB based composite propellant at different strain rates of 0.

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