JCJC SIMI 9 - JCJC - SIMI 9 - Sciences de l'Ingénierie, Matériaux, Procédes et Energie

Slender structures: stability, optimisation, control – SLENDER

Submission summary

In this research, we will investigate and develop applications of multistable composite panels and shells as morphing surfaces capable of large shape changes under external loading and embedded actuation.
This research topic implies the study of complex non linear phenomena that take place during large displacements of slender structures (beams, arches, plates or shells) in order to develop models and tools for the prediction, design and control of such phenomena. Large non linearities are the fundamental keys to understand stability or loss of stability of slender structures, both in the static and dynamic domains.
Our aim is to tackle two relevant subjects in the very large domain of non linear structural behaviour, which will represent the two main axes of the present research project:
i. a first goal is to develop an integrated theoretical and numerical approach to design composite laminates which may hold several equilibrium configurations, exploiting the effects of geometric non-linearities, anisotropy, and pre-stresses induced by the through-the-thickness variation of the material properties. The idea is to start from reasonably simple analytical models for the study of complex non linearities, in order to capture the fundamental phenomena involved, and to validate the captured trends through numerical and experimental tools. These results will open the way to the modelling, design and optimisation of more complex multistable structures;
ii. a second aspect is the theoretical study and experimental test of the use of embedded active materials, such as Shape Memory Alloys (SMA) wires/stripes, to control the shape of the structure without the need for joints or conventional actuators.
Synthetically, our topic is the modelling, optimal design and shape control of slender multistable structures, i.e. structures that can hold several equilibrium positions without the application of external forces. Domains of application are quite wide and they stand at the border of very innovative and recent research topics: such structures are present in Nature, but also are constitutive parts of modern devices, such as morphing or deployable structures for aeronautical and aerospace applications, mirrors, thin screens, and so on.
The developments proposed in our project embrace several aspects: modelling, numerical and experimental validation, optimal design of non linear slender structures.
Considering the field of application and the envisaged research, the present project can be evaluated in the framework of the FRAE-ANR protocol (strong links to themes I, VI, VIII, IX; also possible link to theme III).
This project aims at gathering a group of young scientists who are experts in different fields of structural mechanics (modelling, optimisation and design, elasticity, smart materials, singularity formation, stability, damage,…) in order to build up and consolidate a research team based at Institut Jean Le Rond d’Alembert (IJLRdA), Université Pierre et Marie Curie (UPMC) with external collaborations from Ecole Nationale Supérieure de Cachan and Università Roma 1 La Sapienza. This project will also enhance exchanges among the different fields of structural mechanics which are the background of the team members. Indeed, this project will be also an opportunity to give a contribution to the nascent experimental activity at IJLRdA by the development of simple experimental setups. This experimental activity was initiated few years ago (in the field of fluid mechanics) and it is highly encouraged by the direction of the institute IJLRdA and CNRS.

Project coordination

Angela VINCENTI (Institut Jean Le Rond d'Alembert) – angela.vincenti@upmc.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

IJLRA Institut Jean Le Rond d'Alembert

Help of the ANR 224,652 euros
Beginning and duration of the scientific project: December 2013 - 48 Months

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