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Session: Poster pitches day 3
Session starts: Wednesday 28 June, 10:00
Presentation starts: 10:00
Room: Theatre room: plenary

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Jean-Roch Augustin ()

Abstract:
On July 25, 2000 during the flight Air France 4590, the Concorde at takeoff on a runway of the airport of Paris Charles de Gaulle rolls at high speed on a metallic debris lost by a preceding plane, this incident causes immediately the explosion of the tire and the crash of the aircraft. Since then, the resistance to pneumatic impact has been a dimensional factor in the design of aircraft wings [1]. Impact tests to justify, evaluate or repair equipment are often complex to implement and therefore expensive. Developing a robust numerical model for the dynamic impact of tire fragments can limit the number of tests and better understand the mechanical phenomena of impact. Within the framework of a European TIOC wing project carried out with Dassault, SONACA and CENAERO, DGA TA has developed a tire behavior model. In order to build a robust numerical model, the characterization of the impactor's behavior under real test conditions is essential. In order to have the most global model possible, the geometric parameters, the Mullins effect, the viscoelasticity [2] and the hyper-elastic nonlinearity of the elastomer have been studied. The elastomers that make up aircraft tires are still little known materials, a methodology to characterize their behavior has been developed. Most of the models proposed for the characterization of elastomers are phenomenological models[4], because the internal mechanisms are not yet well identified. The complexity of the construction of a behavioral model lies first in the definition of the domain of use of the specimen and then in the construction of the model adapted to the conditions of use. The last step consists in implementing the model in a finite element software[3]. Phenomenological models being very sensitive to the material data and to the conditions of use, it is difficult to rely on a standard. The identification of the parameters will have to be based on three elements: tests, measurements and modelling. The challenge is to succeed in bringing these elements together to build the building blocks of a Virtual Testing approach, i.e. a robust model of the tire debris and material models validated under the specific impact conditions. This has been achieved by setting up a methodology including tests, measurements by innovative methods of stereo-correlation of digital images and modelling which allows the identification of digital models.