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Failure analysis of composite bolted joints by an experimental and a numerical approach

Montagne, Benoît and Lachaud, Frédéric and Paroissien, Eric and Martini, Dominique Failure analysis of composite bolted joints by an experimental and a numerical approach. (2018) In: 18th European Conference on Composite Materials (ECCM18), 24 June 2018 - 28 June 2018 (Athens, Greece).

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Abstract

Composite materials are widely used by aircraft manufacturers because of their high mechanical properties. These properties severely decrease when composite material are drilled and bolted. To avoid structural failure, the behavior of composite bolted joints has to be understood and mastered. An experimental database was constituted by Dassault Aviation with supported single-shear tests with countersunk head screws on different composite materials. This database is analysed to find the main parameters that lead to the failure of the joint. The end distance is the most important parameter. It has a strong influence on both the bearing stress at failure and the failure mode. Width and lay-up have a lower effect on joint failure. A two-dimensional finite element (FEM) model with elastic membrane behavior is then developed to simulate the different configurations in the database. Fiber failure criteria is computed and the dispersion of the results for each failure mode is compared to the dispersion of the experimental data to evaluate the quality of the model. The modification of the failure criteria by taking into account different ply orientations and shear stress permits to reduce the dispersion but it is still higher than the dispersion of the experimental data. This work highlights the limits of such linear 2D modelling and it confirms the needs for more complex modelling such as the local bending effects of the joints and/or the non linear behavior of the composite material.

Item Type:Conference or Workshop Item (Paper)
HAL Id:hal-01892096
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Dassault Aviation (FRANCE)
Laboratory name:
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Deposited By: Benoit Montagne
Deposited On:28 Sep 2018 14:23

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