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Inverse estimation of the elastic and anelastic properties of anisotropic foams: study of the static/dynamic separation.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics. Siemens Industrial Software, Leuven Belgium.ORCID iD: 0000-0003-4503-4151
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. Centre for ECO2 Vehicle Design.ORCID iD: 0000-0003-1855-5437
2015 (English)In: EURONOISE 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

This paper investigates the modelling and characterisation of the porous frame of anisotropic open-cell foams. The main objective is to nd a suitable model for describing the elastic and anelasticproperties of the material by making as few assumptions as possible. The proposed model is basedon a fractional di erential equation, taking into account the deformation memory of the materialin a versatile and compact manner. In the frequency domain, this results in an augmented Hooke'slaw, where the sti ness matrix of the porous frame consists of a superposition of a fully-relaxed,frequency-independent elastic part, and a dynamic, frequency-dependent anelastic part. In order toestimate the properties of the material and to determine if the elastic and anelastic parts sharethe same material symmetry, two separate experiments are performed. A static photometry setup isdesigned, where a cubic sample of material is compressed along each of the three directions of spacewhile the deformation is recorded on the four exposed faces. Furthermore, a dynamic measurementof a set of transfer functions between each pair of opposed faces of the sample is performed. Thecharacterisation methodology consists of an inverse estimation of the parameters of the model. Thisis acheved by replicating each experiment as a nite element simulation and tting the model byusing an optimisation algorithm. The static and dynamic observations serve as a basis for discussingthe independence of the elastic and anelastic properties of the material.

Place, publisher, year, edition, pages
2015.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-178159OAI: oai:DiVA.org:kth-178159DiVA: diva2:877660
Conference
Euronoise 2015, Maastrich Belgium
Note

QC 20151215

Available from: 2015-12-07 Created: 2015-12-07 Last updated: 2015-12-15Bibliographically approved

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Cuenca, JacquesGöransson, Peter

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