The failure of a viscoelastic material, such as solid propellant, is a complex phenomenon with a requirement to address the following two fundamental and complementary aspects in the failure criteria. First, what is the failure criterion for a solid propellant in stress ± strain space, and what are the variations in failure data when failure is in¯uenced by time and temperature effects? Second, how are conditions for failure in¯uenced by the microstructure of the propellant? In fact, the usual practice is to present failure data in the form of two failure loci: one in the stress ± strain plane where failure points are generated from tests at different strain rates from very low to very high values, and in others these failure stresses and failure strains are plotted against the corresponding strain rates. Uniaxial tensile specimens are generally used to determine the standard failure properties such as tensile strength and the percentage of elongation under constant strain rate and temperature. In order to understand the failure behaviour of propellant materials, the fracture data of a HTPB (hydroxyl terminated polybutadiene) based propellant generated from the uniaxial tensile specimens, is considered. Following the work of Smith and Stredry, the fracture data are represented by the curve of strain at maximum stress versus temperature reduced strain rate, and the failure boundary curve of maximum stress with the corresponding strain. Uniaxial and strip biaxial tension specimens are analysed here for various loading rates. Failure analysis has been carried out by considering the master stress relaxation modulus data as well as the failure data of the propellant.MST/5156
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