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Modeling of crack initiation and growth in solid rocket propellants using macromechanics and micromechanics theories

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Author
Lee, James H.
Date
1996-09
Advisor
Kwon, Young W.
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Abstract
Modeling and simulation of crack initiation and propagation in solid rocket propellant materials were conducted using both the macromechanics approach and the micro/macromechanics approach. Due to their composition, the solid rocket propellant can be construed as particle reinforced composites. The macromechanics approach entailed a numerical simulation of a finite element model to predict the crack behavior based on the damage initiation, growth, and local saturation. Its results were then compared to the experimental data. In the simulation, it was assumed that a crack forms when a damage is saturated in a localized zone. The results from the simulation were quite comparable to the experimental results, validating the method of predicting crack initiation, growth, and arrest using the concept of damage growth and saturation. The second approach involved using a simplified micromechanical model and the damage mechanics being applied at the micromechanics level and the finite element analysis being done subsequently at the macromechanics level. In using this approach, the damage modes such as matrix cracking, interface debonding and particle cracking were explainable in an explicit fundamental manner. Several simulations were conducted using this approach including the cases of non- uniform particle distribution. The predicted results compared well with the experimental data.
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http://hdl.handle.net/10945/32260
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    Modeling and simulation of crack initiation and growth in particulate composites 

    Kwon, Y.W.; Liu, C.T. (1997-08-01);
    A micro/macromechanical approach was used to model and simulate crack initiation and crack propagation in particulate composite structures. The approach used both the micromechanical and macromechanical analyses in tandem. ...
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    Numerical study of damage growth in particulate composites 

    Kwon, Y.W.; Liu, C.T. (Transactions of the ASME, 1999-10);
    A numerical study was conducted to simulate and predict damage initiation and growth around the crack tip in particulate composite specimens made of hard particles embedded in a soft rubber-like matrix material. Therefore, ...
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    Study of the progressive failure of composites under axial loading with varying strain rates 

    Boey, Yew Khuan (Monterey, California. Naval Postgraduate School, 2011-12);
    This study investigated the progressive damage/failure of composite panels with open circular holes under progressive axial loading. A series of experiments was carried out to determine the failure in laminated specimens ...
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