Multi-scale approach of plasterboards dynamics

Approche multi-couche du comportement dynamique des plaques de plâtre

Plasterboards are key components of drywalls systems, dedicated to sound insulation, based on « double-panel » principle. Basic plasterboards are made of two external skins of paper and a gypsum core. These boards can be studied:
– At macroscopic scale. In this framework, one seeks the equivalent and homogeneous mechanical parameters (Young’s modulus, damping) of the board.
– At layers’ scale (sandwich or multi-layer approach). This can be used to predict the equivalent behavior of the board (from the knowledge of each layers) or to characterize the layers (knowing the equivalent parameters).
These approaches are well known in the literature. However, they have been barely applied to plasterboard dynamics. In addition, the structure of plasterboards is changing because of active research to reduce their weight (lowering their cost and material consumption). This reinforces the interest of multi-scale approaches.

Internship objectives:
1. From a modal characterization of the board, develop finite element models to identify homogeneous equivalent parameters. Measurements will use a test bench already existing in the lab. Finite elements models will be done with Comsol, using different plates theories. A secondary objective will be to obtain a user-friendly application based on the model builder of Comsol.
2. To develop a multi-scale approach of plasterboards, to obtain the global behavior of the board or to identify layers’ properties. The approach will use known models from the literature or full multi-scale approaches based on finite elements

Application & Informations:
Send a curriculum and a motivation letter to matthieu.gallezot@saint-gobain.com