Multi-scale analysis of diffusivity in polymers and polymeric matrix composites

Y. T. Yu, K. V. Pochiraju

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

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.

Original languageEnglish
Title of host publicationAmerican Society for Composites - 22nd Technical Conference of the American Society for Composites 2007 - Composites
Subtitle of host publicationEnabling a New Era in Civil Aviation
Pages929-948
Number of pages20
StatePublished - 2007
Event22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation - Seattle, WA, United States
Duration: 17 Sep 200719 Sep 2007

Publication series

NameAmerican Society for Composites - 22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation
Volume2

Conference

Conference22nd Technical Conference of the American Society for Composites 2007 - Composites: Enabling a New Era in Civil Aviation
Country/TerritoryUnited States
CitySeattle, WA
Period17/09/0719/09/07

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