Nouveau titre

Characterisation of anisotropic porous materials

Christophe VAN DER KELEN
KTH, Royal Institute of Technology, Stockholm, Sweden

A challenge which the automotive industry faces, is the design of future lightweight, cost effective vehicle generationswith a high level of noise and vibration comfort at a low environmental impact. Smart Structures Technology could potentially offer tremendous opportunities for improving the performance, quality and environmental impact of products in this and in many other industrial sectors. One of the main challenges is to optimally integrate the layers in a design where their respective properties are fully utilised. To derive adequate simulations models that lead to the design of such an optimised layer construction, it is necessary to determine the properties of the materials to be integrated as layers. These properties have to be known with a relevant precision. The work going on concentrates on porous materials, which are non isotropic in elasticity / viscoelasticity / viscoacoustic properties. New measurement methods to determine these properties in porous materials were developed at MWL. Together with an inverse estimation procedure, the measurement results are used to describe the anisotropic material properties. In a next step these properties will be integrated in an anisotropic Biot model, to optimise an integrated layer design with porous materials. During the presentation, it will be concluded that the porous material tested are orthotropic, and that the measurement method is at least repeatable, a first step towards concluding reliability.

Laboratoire de Mécanique des Structures et des Systèmes Couplés - LMSSC