TY - GEN
T1 - Multi-scale analysis of diffusivity in polymers and polymeric matrix composites
AU - Yu, Y. T.
AU - Pochiraju, K. V.
PY - 2007
Y1 - 2007
N2 - Diffusion of oxygen, nitrogen and moisture into High Temperature Polymeric Matrix Composites (HTPMC) is accelerated by the temperature, pressure and thermochemically induced damage within the composite. This paper describes a multi-scale method to evaluate the interaction of small molecule gas diffusivity, microstructure and damage kinetics in HTPMCs. The molecular scale model of the polymer is based on atomistic representation of the polymer chains and determining the mean-squaredisplacements of gas molecules embedded within the polymer structure in a molecular dynamics minimization scheme. The constituent scale modeling is carried out using Fickian diffusion assumptions and the diffusivity of the materials. The microstructural model entails explicit representation of the fiber and matrix and characterizes the diffusion behavior at the lamina scale. The interaction of damage evolution with the diffusion is characterized at this scale with appropriate homogenization methods. Described methodology provides a comprehensive and practical way for modeling and characterizing the interactions of constituent materials, microstructure, damage kinetics, and diffusion in HTPMCs.
AB - Diffusion of oxygen, nitrogen and moisture into High Temperature Polymeric Matrix Composites (HTPMC) is accelerated by the temperature, pressure and thermochemically induced damage within the composite. This paper describes a multi-scale method to evaluate the interaction of small molecule gas diffusivity, microstructure and damage kinetics in HTPMCs. The molecular scale model of the polymer is based on atomistic representation of the polymer chains and determining the mean-squaredisplacements of gas molecules embedded within the polymer structure in a molecular dynamics minimization scheme. The constituent scale modeling is carried out using Fickian diffusion assumptions and the diffusivity of the materials. The microstructural model entails explicit representation of the fiber and matrix and characterizes the diffusion behavior at the lamina scale. The interaction of damage evolution with the diffusion is characterized at this scale with appropriate homogenization methods. Described methodology provides a comprehensive and practical way for modeling and characterizing the interactions of constituent materials, microstructure, damage kinetics, and diffusion in HTPMCs.
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M3 - Conference contribution
AN - SCOPUS:84867752540
SN - 9781604239669
T3 - American Society for Composites - 22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation
SP - 929
EP - 948
BT - American Society for Composites - 22nd Technical Conference of the American Society for Composites 2007 - Composites
T2 - 22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation
Y2 - 17 September 2007 through 19 September 2007
ER -