29/08/2012 Jana Faes

Meso scale modeling of the mechanical properties of steel-

reinforced epoxy

PhD Symposium December 2012

Jana FaesWim Van Paepegem

Department of Materials Science and Engineering, Ghent University

FACULTY OF ENGINEERING

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STEEL FILAMENT

EPOXY MATRIX

YARN (BUNDLE OF FILAMENTS)

Meso scale modeling of steel reinforced epoxy

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Carbon and glass fibreare BRITTLE

Steel fibresare DUCTILE

ELASTIC deformations up to failure

(brittle) failure is avoided in applications

research limited to elastic regime

PLASTIC deformations & necking before failing

(future) applications might involve damage

research must focus on damage & failure

Meso scale modeling of steel reinforced epoxy

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Meso scale modeling of steel reinforced epoxy

filament-matrix debonding

yarn-matrix delamination

fibre necking

plastic matrix deformation

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Macro

Meso

Micro

structural level

yarn level

fiber level

weft yarn

warp yarn

ONE YARN

fiber filaments

CARBON WHEELS

WEAVE UNIT CELL

Meso scale modeling of steel reinforced epoxy

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GOAL

composite unit cell

Meso scale modeling of steel reinforced epoxy

homogenisation

homogeneous unit cell

DEMAND

Unit cell must behave as if it were part of the material structure

periodic boundary conditions

QUESTION

Will these periodic boundaries still apply when looking at damage?