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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The fracture behavior of ber-ceramics like carbon/carbonsilicon 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 bermatrix 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.
|Title:||Discrete element simulation of transverse cracking during the pyrolysis of carbon fibre reinforced plastics to carbon/carbon composites|
|Journal or Publication Title:||Computational Materials Science|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1-15|
|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|
|Institutes and Institutions:||Institute of Structures and Design|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||14 Jan 2010 12:09|
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