Fiber substrate-based ablators such as Phenolic-Impregnated Carbon Ablator are composite materials comprising a fibrous substrate and a polymer matrix. This paper presents an approach for estimating selected bulk material properties for the purposes of conceptual design and manufacturing evaluations. A filamentary analog model of the substrate, using a volumetric approximation of the individual fibers, is combined with known properties of the cured resin to approximate the composite material, resulting in closed-form expressions for the virgin density, resin mass fraction, and char yield. Two variants of a low-density carbon felt/phenolic resin ablator were fabricated for comparison to the analytical approximations. Bounds on the material properties were generated from the closed-form expressions and then compared to Monte Carlo results. A linear regression analysis was then used to correlate output uncertainties to those of the input parameters to understand the drivers of material variability.


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    Title :

    Constitutive Model of Fiber Substrate Ablators for Conceptual Design


    Contributors:

    Published in:

    Publication date :

    2020-01-13


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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