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CivilComp Proceedings
ISSN 17593433 CCP: 79
PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and C.A. Mota Soares
Paper 39
Mesodynamics of a 3D C/C Composite under Shock Loading: a Dedicated Computational Multiscale Approach J. Sen Gupta+, O. Allix+, P.A. Boucard+, A. Fanget* and P.L. Héreil*
+LMTCachan (E.N.S. Cachan / C.N.R.S. / University Paris VI), Cachan, France
, "Mesodynamics of a 3D C/C Composite under Shock Loading: a Dedicated Computational Multiscale Approach", in B.H.V. Topping, C.A. Mota Soares, (Editors), "Proceedings of the Seventh International Conference on Computational Structures Technology", CivilComp Press, Stirlingshire, UK, Paper 39, 2004. doi:10.4203/ccp.79.39
Keywords: impact, damage mesomodel, fracture prediction, computation, domain decomposition, dynamics.
Summary
In a previous work done at LMT Cachan in collaboration
with CE Gramat, a modeling of a 3D C/C composite at the mesoscale
(scale of the matrix blocks, yarns sections, interfaces) including damage, sliding and compaction
has been proposed
and identified (see [1,2]).
These nonlinearities have
to be taken into account to represent correctly the mesodynamics of
the material. Moreover, in order to represent accurately the geometry of the mesoconstituents
(see figure 1a for characteristic lengths), we need at least
10,000 DOFs per mm.
Thus, the 3D calculation of the shock behaviour of this material at such a scale leads to computations of very large size and highly nonlinear. The approach deals with a domain decomposition strategy in order to :
We extend a mixed domain decomposition method used in dynamics for the cases where the nonlinearities were concentrated at the interface (see [3]) to the case where both the interfaces and the substructures have a nonlinear behaviour. The method is based on three main ideas:
The result of a parallel 3D computation with linear substructures and contact interfaces is shown in figure 1b. References
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