The present work is aimed at studying the interfacial debonding behavior between the hydroxyl-terminated polybutadiene solid propellant and liner. The fracture mechanics method based on J integral was used to evaluate the interface’s resistance against crack initiation and propagation, with the auxiliaries of the multisample test procedure and high-speed camera. The discrete fracture parameters at different interfacial-crack initiation moments and crack extension amounts, including the load, displacement, and fracture energy, were well fitted using the least-squares method and the second-order polynomial regression method. The crack blunting process was observed to fit the blunting line realistically. The 95% confidence intervals of fracture parameters were obtained by conducting the regression error analyses based on the t -distribution to include the experimental uncertainties. The mean value of the crack initiation J integral, J C = 0.6326    kJ / m 2 , was obtained. The mean value of the apparent initiation fracture toughness, J IC = 0.6753    kJ / m 2 , was determined by combining the blunting line and J -integral-based resistance curve. The regression result of J IC was characterized by a narrower 95% confidence interval compared with the one of J C . Further, the interfacial-debonding mechanism and its influence on the overall failure were investigated.


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    Title :

    Interfacial Fracture Toughness Between Hydroxyl-Terminated Polybutadiene Solid Rocket Propellant and Liner


    Contributors:

    Published in:

    Publication date :

    2018-07-25


    Size :

    8 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English