In this study, a novel multiscale combined creep strain and creep rupture model is proposed. By comparing to experimental data, it was shown that the model provides accurate creep rupture predictions for unidirectional off-axis specimens. The creep strain model provides accurate predictions within the confines of the restrictions used in its development. This coupled model was incorporated into a progressive failure finite-element simulation so that the effects of load redistribution could be considered, which tended to increase the life of the part when strain gradients were present. The finite-element implementation also allowed for the consideration of realistic geometries resulting in complex stress states. By considering a perfectly flat specimen and one containing worst-case thickness variation, experimental open-hole creep rupture data was accurately bounded. This suggests that, by quantifying material defects, realistic lifetime predictions can be made, and an estimate of scatter can be acquired.


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    Title :

    Physics-Based Multiscale Creep Strain and Creep Rupture Modeling for Composite Materials


    Contributors:

    Published in:

    AIAA Journal ; 54 , 2 ; 703-711


    Publication date :

    2015-10-07


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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