A method for inverse estimation of the static elastic properties of anisotropic poroelastic foams - with application to a melamine foam
2013 (English)Report (Refereed)
The paper presents a method for the characterisation of the static, fully relaxed elastic properties of poroelastic materials. The approach is based on full field measurements of the 3D displacements in a number of points on the faces of the compressed material sample. These are used as targets in an inverse estimation to fit a model of the material to experimental data. In the current work, the material is modelled as an orthotropic equivalent solid, of which the principal directions are not necessarily aligned with the orthonormal coordinate system in which the experiments are conducted. The angles of relative orientation accounting for the misalignment are among the properties to be estimated. In addition, the proposed model considers the region of reduced stiffness close to material discontinuities, which has been identified in previous investigations. The method presented is verified for an artificial material, and its robustness is studied. A characterised melamine foam is found to have an orthotropic symmetry, and its lowest stiffness in the direction parallel to the rise direction of the material.
Place, publisher, year, edition, pages
Textile, Rubber and Polymeric Materials Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-137750OAI: oai:DiVA.org:kth-137750DiVA: diva2:679697
FunderEU, European Research Council, MRTN-CT-2006-035559
QC 20132013-12-162013-12-162013-12-19Bibliographically approved