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Modélisation numérique du contact pour matériaux composites

Abstract : New baseline turbofan engines feature advanced blade technology made of 3D woven composites for a significant reduction in weight and an increase in energy and environmental performance. Woven structures generally have complex architectures wich require high level of mechanical model. Modeling textile and homogenization tools have been developed to provide precisely the geometry and physical properties of the woven architecture. However, it is important to predict the damage mode under contact zone which are subjected to fretting. Indeed, the blade roots of turbofan engines are damaged by fretting phenomenon. Fretting modes generate two kinds of damage : (i) the initiation and propagation cracks, (ii) wear on contact surfaces. Quantify these two kinds of damage requires a detailed contact analysis from a robust and fast contact solver. In order to reach this goal, a semi-analytical solver allows to solve heterogeneous elasto-plastic contact problems. Equivalent inclusion method in the sense of Eshelby allows to describe accurately the effect of inhomogeneities (cavities, inclusions, fibers or strands). Only one of contact bodies contains multiple heterogeneous of cuboïdal and ellipsoidal shapes, and their degenerated forms (oblate spheroid, prolate ellipsoid, sphere, cylinder, flat disk,...). This method is modified and improved in order to take into account the mutual influence between neighboring heterogeneous inclusions and decohesion at the interface heterogeneity/matrix. A first coupling with a finite element model of blade/disk contact allows to take into account the effects of structure. This method is analogous to a structural zoom when structural fine mesh is necessary within areas of high contact stress gradient subjected to fretting. A second coupling with the software WiseTex allows to describe the geometry of the actual weaving of the composite, the material properties of the fibers and the matrix. A fine segmentation of the numerical model allows to discretize reinforcements to multiple equivalent ellipsoidal heterogeneities and to apply the modified equivalent inclusion method. Three-dimensional simulation of frictional contact model are successfully completed from these data of a coating woven composite.
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  • HAL Id : tel-00961209, version 1

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Julien Leroux. Modélisation numérique du contact pour matériaux composites. Autre. INSA de Lyon, 2013. Français. ⟨NNT : 2013ISAL0042⟩. ⟨tel-00961209⟩

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