Éléments finis mixtes singuliers 3D pour le calcul des “surcontraintes” dans les assemblages de composites
Keywords:
composites, mixed finite elements, stress concentration, junctionsAbstract
This work deals with the development of a mixed three-dimensional finite element family, particularly well fitted to overstress estimation in composite structures. In the first part, a code for precise evaluation of stress concentration is presented, enabling the investigation of many practical situations including singularities. In the second part, a 3D mixed finite element is developed, providing the distribution of stress intensity factors along the singularity lines. The proposed extraction scheme is based on a simple static condensation and does not require any contour integration. This general and simple method allows thereby relatively coarse meshing without significant loss of precision of stress singularity estimation.
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