Degradation due to oxidation around voids, cracks and holes

Kishore Pochiraju, Gyaneshwar Tandon

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

Abstract

High Temperature Polymer Matrix Composites (HTPMCs) exposed to oxidizing environments are subject to mechanical property degradation due to chemical changes in the resin. Long-term degradation rates due to oxidation in a composite structure are controlled by the damage evolution rates in the oxidized zones, which in turn are determined by the composite’s strength and toughness in these regions. The presence of voids, cracks, and holes in the structure alters the local oxidation zone morphologies. In this paper, we describe a methodology for prediction of Open Hole Tensile (OHT) residual strength of isothermally-aged IM7/(bis) maleimide quasi-isotropic composites under static loading. The composite oxidation profiles around holes are explained by monitoring the development and growth of damage through fluorescence imaging in conjunction with optical microscopy and X-ray computed tomography (CT) techniques. Preferred damage initiation directions are investigated for several combinations of the fiber orientations with respect to the mechanical loading direction and its influence on OHT. The paper presents comparisons of observed and simulated microstructure changes and correlations of damage states and strength predictions with experimental observations.

Original languageEnglish
Title of host publication32nd Technical Conference of the American Society for Composites 2017
EditorsJohnathan Goodsell, R. Byron Pipes, Wenbin Yu
Pages453-463
Number of pages11
ISBN (Electronic)9781510853065
StatePublished - 2017
Event32nd Technical Conference of the American Society for Composites 2017 - West Lafayette, United States
Duration: 23 Oct 201725 Oct 2017

Publication series

Name32nd Technical Conference of the American Society for Composites 2017
Volume1

Conference

Conference32nd Technical Conference of the American Society for Composites 2017
Country/TerritoryUnited States
CityWest Lafayette
Period23/10/1725/10/17

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