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A method for inverse estimation of the static elastic properties of anisotropic poroelastic foams - with application to a melamine foam
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.ORCID iD: 0000-0003-1855-5437
2013 (English)Report (Refereed)
Abstract [en]

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
2013.
National Category
Textile, Rubber and Polymeric Materials Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-137750OAI: oai:DiVA.org:kth-137750DiVA: diva2:679697
Funder
EU, European Research Council, MRTN-CT-2006-035559
Note

QC 2013

Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2013-12-19Bibliographically approved
In thesis
1. Vibro-acoustic modelling of anisotropic poroelastic materials: characterisation of the anisotropic properties
Open this publication in new window or tab >>Vibro-acoustic modelling of anisotropic poroelastic materials: characterisation of the anisotropic properties
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present-day challenges in the transport industry, steered by the increasing environmental awareness, necessitate manufacturers to take measures to reduce emissions related to the movements of goods and humans. In particular, the measures aiming at a reduced mass or higher load capacity to increase fuel efficiency,  generally deteriorate the noise and vibration insulation properties of their products. In order to comply with the regulations and customer demands, modern vehicles increasingly move towards a multifunctional integrated design approach, if possible for all subcomponents involved. Such a multifunctional design approach is an iterative process, evaluating the proposed solutions in every stage, and is therefore best performed in a virtual testing environment. \\Poroelastic materials are interesting to include in a multifunctional design, offering reasonably good vibro-acoustic insulation properties at a low weight penalty. These materials can also be combined in multilayer arrangements to further enhance the overall performance. \\In order to achieve an accurate modelling of the vibro-acoustic behaviour of poroelastic materials, the input data describing the material properties should be of a high quality. Two characteristics inherent to these materials encumber a precise characterisation with traditional techniques. Poro-elastic aggregates are anelastic due to the constituent material used, and anisotropic as a consequence of the production process. Characterisation techniques allowing for an accurate determination of the material properties need to take these intrinsic characteristics into account.\\The objective in this thesis is to enable the characterisation of a constitutive material model for poroelastic materials which is as general as possible, and includes the inherent material anelasticity and anisotropy. For this purpose, a set of advanced characterisation techniques has been developed to characterise the anisotropic flow resistivity tensor and the anisotropic dynamic Hooke's tensor. \\These advanced characterisation techniques are based on an inverse estimation procedure, used consistently throughout the work, and includes both experiments and numerical predictions. The property to characterise is isolated in a specially designed set-up such that it can be modelled by physics solely involving this property. The obtained experimental and numerical data then serve as the input to an optimisation, which returns the material properties for which the difference between both is as small as possible. These methods have been successfully applied to melamine foam, which is found to be both anisotropic and anelastic, confirming the need for such advanced characterisation techniques.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiv, 58 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013:67
National Category
Fluid Mechanics and Acoustics Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:kth:diva-137809 (URN)978-91-7501-983-3 (ISBN)
Public defence
2014-01-20, sal F3, KTH, Lindstedtsvägen 26, Stockholm, 13:15 (English)
Opponent
Supervisors
Funder
EU, European Research Council, MRTN-CT-2006-035559
Note

QC 20131219

Available from: 2013-12-19 Created: 2013-12-16 Last updated: 2013-12-19Bibliographically approved

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Göransson, Peter

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