Multiaxial behavior of foams – Experiments and modeling

Mahéo, Laurent; Guérard, Sandra; Rio, Gérard; Donnard, Adrien; Viot, Philippe

doi:10.1051/epjconf/20159404035

Cited by 4 publications

(3 citation statements)

References 13 publications

(20 reference statements)

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“…Especially expanded polypropylene (EPP) has received a lot of attention over the years [18]- [23]. Maheo et al [23] tested EPP foams to study the multiaxial behaviour of the material.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static behaviour of crash components with steel skins and polymer foam cores

Reyes

2018

Materials Today Communications

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Different types of crash components are extensively used by the automotive industry to absorb energy during car accidents. Such components typically consist of sandwich structures with thin metal or composite plates as skins and a cellular foam as core to dissipate the energy. In this study, the quasi-static behaviour of two types of polymeric foams with different densities, namely extruded polystyrene (XPS) and expanded polypropylene (EPP), utilized as core material in a crash component, has been investigated. First, an extensive material test program involving compression tests on cubic specimens loaded in different material directions was carried out to reveal the mechanical properties of the foams. Second, quasi-static impact tests were conducted on various target configurations consisting of 0.8 mm thick skins of Docol 600DL steel and the various foam materials as core. In these tests, the applied force and the displacement of the striker were registered by the test machine, while digital cameras and 3D-DIC were used to measure the back-plate out-of-plane displacement of the various components.It seems clear from the presented results that if low weight combined with maximum energy absorption are the primary interests, an XPS foam as core seems to be beneficial, while if force reduction and minimum back-plate displacement are most important, an EPP foam as core seems to be a better choice. Thus, the response of the crash component is largely determined by the properties of the core material during quasi-static loading.

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“…Especially expanded polypropylene (EPP) has received a lot of attention over the years [18]- [23]. Maheo et al [23] tested EPP foams to study the multiaxial behaviour of the material.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static behaviour of crash components with steel skins and polymer foam cores

Reyes

2018

Materials Today Communications

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“…4,5,7,13 Although less considered in literature, the viscoelastic properties at small strains are equally important as they represent the key to understand and predict damping 14 and fatigue behavior 15,16 of bead foams. Viscoelastic properties of polymeric foams have been analyzed with universal testing machines 7,17 and dynamic-mechanical analyzers (DMA). 14,[18][19][20][21][22] Alternative methods such as resonance and wave propagation are predominantly used to determine viscoelastic or vibro-acoustic properties at high frequencies.…”

Section: Introductionmentioning

confidence: 99%

On the determination of viscoelastic properties of EPP foam in dependence on pre-strain and loading direction

Müller-Pabel,

Meuchelböck,

Koch

et al. 2023

Journal of Cellular Plastics

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Understanding the viscoelastic properties of EPP foams is of crucial importance for their use in industrial applications. However, mechanical testing of polymeric foams is challenging due to the difficulties that arise from their morphology. For this reason, here currently available DMA methods using a single drive and a multi-drive rheometer as well as multiple loading directions are investigated in detail. Experimental challenges are highlighted and discussed with regard to foam-specific properties. Special focus is laid on the influence of compressive pre-strain. Based on the results, guidelines to perform reproducible DMA tests on the investigated type of material are derived. In addition, the results give deeper insight into the deformation behavior of bead foams at small strain levels and reveal an early onset of the transition from linear to plateau regime.

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“…This Polypropylene foam has been studied in detail by Viot et al [5,7,12]by T performing uniaxial and hydrostatic compression tests at several strain rates. In the present study, simple shear tests and tests involving simple shear combined with uniaxial compression were conducted using a novel hexapod device [20] with which controlled shape changes and volume changes can be imposed. Using the method of analysis presented in Refs.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial experiments with radial loading paths on a polymeric foam

et al. 2018

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Cellular materials such as polymeric foams in particular have been widely studied under uniaxial loading conditions. Many experimental studies have been focusing recently, however, on the responses of these foams to multiaxial loads. In the present study, a novel experimental hexapod device was used to perform combined uniaxial compression and simple shear tests. Using a post-processing method of analysis which can be used to study elementary mechanical behavior, the authors show the occurrence of non-proportional stress paths in the material under investigation although proportional kinematic paths were imposed. A failure limit criterion is presented for use with the foam of interest. The results of the present analysis yield useful information for meeting our future objective, namely to develop a numerical model for simulating multiaxial loading conditions.

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Multiaxial behavior of foams – Experiments and modeling

Cited by 4 publications

References 13 publications

Quasi-static behaviour of crash components with steel skins and polymer foam cores

Quasi-static behaviour of crash components with steel skins and polymer foam cores

On the determination of viscoelastic properties of EPP foam in dependence on pre-strain and loading direction

Multiaxial experiments with radial loading paths on a polymeric foam

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