✍ Scribed by S.Y. Ho
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The effect of predamage on the high strain-rate behavior, ignition sensitivity, and impact ignition mechanism of a HTPB/AP rocket propellant was assessed using a modified Hopkinson Bar. Damage was induced by constant stress and monotonic tension tests prior to testing on the modified Hopkinson Bar. Predamage was characterized using a failure criterion based on a linear Cumulative Damage model. Creep and recovery experiments were conducted to determine the amount of recovery (due to relaxation or viscoelastic effects) and rehealing of damage (nonrecoverable strain), and the effect of recovery time on the induced mechanical damage. The effect of residual void volume on the impact ignition sensitivity and mechanism for freshly damaged, rehealed, and undamaged propellant samples was also investigated.
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