Damage hybrid and meso-modelling of composite: the framework and some complement to deal with impact and energy absoption
Cancelled
Event details
| Date | 07.11.2014 |
| Hour | 12:15 › 13:15 |
| Speaker | Prof. Olivier Allix, ENS Cachan, France |
| Location | |
| Category | Conferences - Seminars |
The intensive use of long-fibers composite laminates in aeronautics or automotive applications implies to master the prediction of any behaviour up to final failure. The so-called virtual testing approach supports this goal and relies on the use of robust models for key physical mechanisms.
Following the works of Ladevèze [1-2] and co-workers this presentation will rely on two types of models to deal with:
- hybrid model for material virtual testing of small coupons, where all possible cracks are introduced ;
- an homogenized damage meso-model for the virtual testing of larger specimens.
Motivated by the virtual testing of energy absorbers the presentation will discussed, within those model frameworks, the introduction of two particular aspects: the kinking phenomenon [3] and the rate dependent modelling of delamination [4]. The question of the objective simulation of erosion and failure of composite in dynamics by damage mechanics will also be discussed [5].
[1] P. LADEVEZE, G. LUBINEAU, AND D. VIOLEAU. A computational damage micromodel of laminated composites. International Journal of Fracture, 137(1):139-150, 2006.
[2] LADEVEZE, P., LUBINEAU, G., MARSAL, D. Micromechanics and Mesomechanics of Laminates: Synergy and Model Improvements. Jounal of the Mechanical Behavior of Materials. Vol 19. Num 2-3. Pages 159-166. 2009
[3] ALLIX O., FELD N. , BARANGER E., GUIMARD J-M & HA-MINH C., The compressive behaviour of composites including fiber kinking: modelling across the scales, to appear in Meccanica 2014
[4] GUIMARD, J.M., ALLIX, O., PECHNIK, N., THEVENET, P. Characterization and modeling of rate effects in the dynamic propagation of Mode-II delamination in composite laminates. Int Jal of Fracture. Vol 160. Num 1. Pages 55-71. 2009
[5] ALLIX, O. The bounded rate concept: a framework to deal with objective failure predictions in dynamic within a local constitutive model. Int Jal of Damage Mechanics. Vol 22. Pages 808-828. 2013
Bio : Olivier Allix is Professor (of Exceptional class) at the Ecole Normale Supérieure de Cachan and previous director of LMT-Cachan and is member of the prestigious Institut Universitaire de France. Olivier Allix has worked intensively in connection with Airbus and other companies on the modelling of the mechanical behaviour of composites and the developement of multiscale strategies to deal with those complex material and structures. He recently proposed non intrusive computational methods to easily implemnt those techniques into commercial packages. Olivier Allix serves as member of 12 editorial boards of international journals. He organized the Fourth European Conference on Computational Mechanics in Paris in 2010 with more than 2000 participants and is an Euromech and IACM fellow.
Following the works of Ladevèze [1-2] and co-workers this presentation will rely on two types of models to deal with:
- hybrid model for material virtual testing of small coupons, where all possible cracks are introduced ;
- an homogenized damage meso-model for the virtual testing of larger specimens.
Motivated by the virtual testing of energy absorbers the presentation will discussed, within those model frameworks, the introduction of two particular aspects: the kinking phenomenon [3] and the rate dependent modelling of delamination [4]. The question of the objective simulation of erosion and failure of composite in dynamics by damage mechanics will also be discussed [5].
[1] P. LADEVEZE, G. LUBINEAU, AND D. VIOLEAU. A computational damage micromodel of laminated composites. International Journal of Fracture, 137(1):139-150, 2006.
[2] LADEVEZE, P., LUBINEAU, G., MARSAL, D. Micromechanics and Mesomechanics of Laminates: Synergy and Model Improvements. Jounal of the Mechanical Behavior of Materials. Vol 19. Num 2-3. Pages 159-166. 2009
[3] ALLIX O., FELD N. , BARANGER E., GUIMARD J-M & HA-MINH C., The compressive behaviour of composites including fiber kinking: modelling across the scales, to appear in Meccanica 2014
[4] GUIMARD, J.M., ALLIX, O., PECHNIK, N., THEVENET, P. Characterization and modeling of rate effects in the dynamic propagation of Mode-II delamination in composite laminates. Int Jal of Fracture. Vol 160. Num 1. Pages 55-71. 2009
[5] ALLIX, O. The bounded rate concept: a framework to deal with objective failure predictions in dynamic within a local constitutive model. Int Jal of Damage Mechanics. Vol 22. Pages 808-828. 2013
Bio : Olivier Allix is Professor (of Exceptional class) at the Ecole Normale Supérieure de Cachan and previous director of LMT-Cachan and is member of the prestigious Institut Universitaire de France. Olivier Allix has worked intensively in connection with Airbus and other companies on the modelling of the mechanical behaviour of composites and the developement of multiscale strategies to deal with those complex material and structures. He recently proposed non intrusive computational methods to easily implemnt those techniques into commercial packages. Olivier Allix serves as member of 12 editorial boards of international journals. He organized the Fourth European Conference on Computational Mechanics in Paris in 2010 with more than 2000 participants and is an Euromech and IACM fellow.
Practical information
- General public
- Free
Organizer
- Prof. Nikolas Geroliminis & Katrin Beyer
Contact
- Prof. Jean-François Molinari