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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 41
ADVANCES IN THE ANALYSIS AND DESIGN OF COMPOSITES Edited by: B.H.V. Topping
Paper III.1
Delamination Analysis of Thin Composite Structures using a Multi-Director Formulation F. Gruttmann and W. Wagner
Institute of Statics, University of Karlsruhe (TH), Karlsruhe, Germany Full Bibliographic Reference for this paper
F. Gruttmann, W. Wagner, "Delamination Analysis of Thin Composite Structures using a Multi-Director Formulation", in B.H.V. Topping, (Editor), "Advances in the Analysis and Design of Composites", Civil-Comp Press, Edinburgh, UK, pp 51-59, 1996. doi:10.4203/ccp.41.3.1
Abstract
A numerical model for the nonlinear analysis of laminated
shells is presented. The developed isoparametric layered
shell element is based on a multi-director formulation.
Piecewise polynomial functions are used to interpolate the
displacement field through the thickness. Thus the developed
element is able to predict the complete stress state.
Within a nonlinear static analysis onset of delamination
is described by exploiting a stress based fracture criterion
between adjacent layers. Additional nodal variables are
introduced to describe the vector of crack opening displacement.
Crack propagation and the final delamination
zone for a prescribed load level is achieved by fulfilment
of the weak form of equilibrium and of the fracture
criterion.
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