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ANALYSIS OF DAMAGE AND FAILURE MECHANISMS OF QUILTED STRATUM PROCESS® COMPOSITE PARTS

Yann Todeschini (ONERA-The French aerospace Lab) Cédric Huchette (ONERA-The French aerospace Lab) Cédric Julien (ONERA-The French aerospace Lab) Denis Espinassou (CETIM)

 

The research work proposed here aims at studying, from the experimental and numerical standpoints, the damage and failure mechanisms of heterogeneous laminates containing discontinuous plies.

 

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EVALUATION AND VERIFICATION OF TEMPERATURE DEPENDENT OUT-OF-PLANE SHEAR MODULUS OF DISCONTINUOUS CARBON FIBER REINFORCED THERMOPLASTIC COMPOSITE BY MODIFIED DOUBLE NOTCHED COMPRESSION METHOD.

Wataru Nagatsuka (University of Tokyo) Tsuyoshi Matsuo (University of Tokyo) Takashi Murakami (Shimadzu Corporation) Mitsuharu Kan (HONDA R&D) Jun Takahashi (University of Tokyo)

 

This paper suggested the model for predicting the out-of-plane shear modulus of discontinuous carbon fiber reinforced thermoplastics have considered the viscoelastic properties of matrix resin. And it was verified by the improved test method.

 

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PREDICTION OF STIFFNESS FOR TOW-BASED DISCONTINUOUS COMPOSITES

Yizhuo Li (Imperial College London) Soraia Pimenta (Imperial College London) Manon Thierry (Imperial College London) Wei Yu Tan (Imperial College London)

 

An FE model with an inhomogeneous local stiffness field (generated from a statistical model) of TBDCs was developed. It generates a heterogeneous strain field of a specimen under uniform stress, which agrees well with experimental data.

 

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MODELLING THE HYSTERESIS BEHAVIOR OF FABRIC CARBON COMPOSITE USING A COLLABORATIVE ELASTO-PLASTO-DAMAGE MODEL WITH FRACTIONAL DERIVATIVE

Alina Krasnobrizha (Ecole Centrale de Nantes) Laurent Gornet (Institut de Recherche en Génie Civil et Mécanique) Patrick Rozycki (Institut de Recherche en Génie Civil et Mécanique) Pascal Cosson (Institut de Recherche en Génie Civil et Mécanique)

 

The developed modelling of self-heating test is a fast method to determine the fatigue limit for composites. The collaborative model is used to represent the elastoplastic damage behavior and the hysteresis loops and to calculate the dissipation.

 

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MODELLING INITIATION AND EVOLUTION OF FATIGUE DAMAGE IN COMPOSITE LAMINATES

Marino Quaresimin (University of Padova) Paolo Andrea Carraro (University of Padova) Elisa Novello (University of Padova)

 

A damage based strategy for the prediction of fatigue damage and failure in composite laminates is presented. Results and predictions for initiation and propagation of off-axis cracks and delaminations are illustrated and discussed.

 

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NONDESTRUCTIVE INVESTIGATION OF THE VHCF-ENDURANCE ON CYCLICALLY LOADED CFRP BY X-RAY-REFRACTOGRAPHY

Volker Trappe (BAM Federal Institute for Materials Research and Testing) Alexander Müller (BAM Federal Institute for Materials Research and Testing) Stefan Hickmann (BAM Federal Institute for Materials Research and Testing)

 

A testing machine was integrated in a SAXS-setup. X-ray refraction topography was performed while the CFRP-samples were tensile and cyclically loaded. This non-destructive technique enables the detection of micro-cracking and IFF especially for CFRP.

 

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NOVEL TEST METHOD FOR CHARACTERIZATION OF UNIDIRECTIONAL COMPOSITE FATIGUE PROPERTIES

Andre Tost (IMA Materialforschung und Anwendungstechnik GmbH) Frank Heinrich (IMA Materialforschung und Anwendungstechnik GmbH) Jens Ridzewski (IMA Materialforschung und Anwendungstechnik GmbH)

 

The development and test results of a novel test method for the fatigue characterization of unidirectional composites will be presented, suitable for all load ratios and a wide range of laminate thicknesses.

 

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NUMERICAL AND EXPERIMENTAL EVALUATION OF FATIGUE PERFORMANCE OF BEARING LAMINATES

Marco Hoffmann (Airbus Group Innovations) Victoria Otto (Airbus Helicopters) Tamas Havar (Airbus Group Innovations) Elif Ahci (Airbus Helicopters)

 

A numerical method was developed to predict the fatigue bahaviour of composite laminates. It was validated on coupon level and applied to predict the failure of bearing laminates.

 

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OPEN HOLE AND COMPRESSION AFTER IMPACT TESTING OF CARBON FIBRE/EPOXY LAMINATES AND THE INFLUENCE OF ENVIRONMENTAL EXPOSURE

Katleen Vallons (KU Leuven) Takuya Karaki (Toray) Ichiro Taketa (Toray) Stepan Lomov (KU Leuven) Ignaas Verpoest (KU Leuven)

 

This paper contains the results of a study on the open hole tensile and compression properties and the compression after impact properties of a carbon fibre - epoxy composite, with and without exposure to environmental conditioning.

 

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PERIDYNAMICS FOR FATIGUE DAMAGE PREDICTION IN NOTCHED COMPOSITES

Yile Hu (University of Arizona) Erdogan Madenci (University of Arizona) Nam Phan (Naval Air Systems Command (NAVAIR))

 

This study presents a peridynamic modeling of laminated composites with arbitrary fiber orientation and stacking sequence in order to predict damage initiation and its growth under cyclic loading.

 

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