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Discrete element simulation of transverse cracking during the pyrolysis of carbon fibre reinforced plastics to carbon/carbon composites

Wittel, F. K. and Schulte-Fischedick, J. and Kun, F. and Kröplin, B.-H. and Frieß, M. (2003) Discrete element simulation of transverse cracking during the pyrolysis of carbon fibre reinforced plastics to carbon/carbon composites. Computational Materials Science, 28 (1), pp. 1-15.

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Abstract

The fracture behavior of ber-ceramics like carbon/carbon–silicon carbide strongly depends on the initial damage arising during the production process. We study the transverse cracking of the 90 ply in ½0=90S crossply laminates due to the thermochemical degradation of the matrix material during the carbonization process by means of a discrete element method. The crack morphology strongly depends on the ber–matrix interface properties, the transverse ply thickness as well as on the carbonization process itself. To model the 90 ply a two-dimensional triangular lattice of springs is constructed where nodes of the lattice represent bers. Springs with random breaking thresholds model the disordered matrix material and interfaces. The spring-lattice is coupled by interface springs to two rigid bars which capture the two 0 plies or adjacent sublaminates in the model. Molecular dynamics simulation is used to follow the time evolution of the model system. It was found that under gradual heating of the specimen, after some distributed cracking, segmentation cracks occur in the 90 ply which then develop into a saturated state where the ply cannot support additional load. The dependence of the microstructure of damage on the ply thickness and on the disorder in spring properties is also studied. Crack density and porosity of the system are monitored as a function of the temperature and compared to an analytic approach and experiments.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2003,
Title:Discrete element simulation of transverse cracking during the pyrolysis of carbon fibre reinforced plastics to carbon/carbon composites
Authors:
AuthorsInstitution or Email of Authors
Wittel, F. K.ISD, Uni Stuttgart
Schulte-Fischedick, J.UNSPECIFIED
Kun, F.Uni Debrecen, Ungarn
Kröplin, B.-H.ISD, Uni Stuttgart
Frieß, M.UNSPECIFIED
Date:2003
Journal or Publication Title:Computational Materials Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:28
Page Range:pp. 1-15
Status:Published
Keywords:Discrete element model; Numerical simulation; Composite material; Pyrolysis; Thermal degradation
HGF - Research field:other
HGF - Program:UNSPECIFIED
HGF - Program Themes:UNSPECIFIED
DLR - Research area:no assignement
DLR - Program:UNSPECIFIED
DLR - Research theme (Project):UNSPECIFIED
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 13:09

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