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PROCEEDINGS OF THE SEVENTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping and C.A. Mota Soares
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*
+LMT-Cachan (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", Civil-Comp Press, Stirlingshire, UK, Paper 39, 2004. doi:10.4203/ccp.79.39
Keywords: impact, damage mesomodel, fracture prediction, computation, domain decomposition, dynamics.
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 non-linearities 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 non-linear. 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 non-linearities were concentrated at the interface (see ) to the case where both the interfaces and the substructures have a non-linear 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.
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