Storage Lifetime Prediction of HTPB Coating in Solid Rocket Motor

To accurately predict the storage lifetime of hydroxyl-terminated polybutadiene (HTPB) coating in solid rocket motor, the accelerated aging test was conducted under 323.15K, 333.15K, 343.15K and 353.15K. The Arrhenius method was chosen as the aging model, which was aimed to predict the lifetime of the samples in normal temperature. The results show that the power function model with α = 0.4 can describe the variation law of maximum elongation with time. Regarding the maximum elongation decline of 50% as the failure criterion, the predicted storage lifetime of HTPB coating is 16.70 years at 298.15K, which is able to satisfy the aging properties requirements of the coating.