Polypropylene foam behaviour under dynamic loadings: Strain rate, density and microstructure effects

Bouix, Rémy; Viot, Philippe; Lataillade, Jean-Luc

doi:10.1016/j.ijimpeng.2007.11.007

Cited by 168 publications

(147 citation statements)

References 40 publications

(41 reference statements)

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“…2. All curves exhibit some oscillation due to the vibration of the testing device and specimens, as mentioned by other researchers regarding other cellular materials [25,26]. However, these oscillations were greatest for the smallest thickness studied (15 mm), possibly due to the lower damping in this specimen.…”

Section: Contact Forcesupporting

confidence: 65%

Dynamic crushing behaviour of agglomerated cork

Sánchez-Sáez

García-Castillo

Barbero

et al. 2015

Materials & Design (1980-2015)

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-For reasons of energy saving and pollution reduction, there is a growing interest in the development of lightweight structures manufactured with materials of natural origin and recyclable. Agglomerated cork is a mixture of natural cork and an organic binder, and can be considered an alternative to polymeric foams used in structural applications with a high capacity of energy absorption. One of these applications involves impact-absorbing elements in vehicles, which are subjected mainly to dynamic compressive loads. In this work, the dynamic crushing behaviour of agglomerated cork was experimentally studied, analysing the influence of the specimen thickness on the energy-absorption capacity, contact force, displacement, and strain. Dynamic crushing tests with specimens of four different thicknesses were performed in a drop-weight tower. An increase in the maximum contact force, displacement, and strain was observed when the impact-energy/thickness ratio increased. For each specimen thickness a linear variation of the maximum displacement and energy absorbed with the impact-energy/thickness ratio was found. It was observed that the energy absorbed by agglomerated cork did not depend on the specimen thickness, but only on the impact energy.

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Section: Contact Forcesupporting

confidence: 65%

Dynamic crushing behaviour of agglomerated cork

Sánchez-Sáez

García-Castillo

Barbero

et al. 2015

Materials & Design (1980-2015)

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“…Three scales can therefore be defined: the macroscopic scale for the foam sample, the mesoscopic scale for the beads and the microscopic scale for the microscopic cells. These microscopic and mesoscopic structures have an influence on the macroscopic behavior, as shown experimentally by Viot et al [8] and Bouix et al [9]. Several models have already been implemented in many software calculation codes to represent the foam behavior.…”

Section: Introductionmentioning

confidence: 89%

“…An important experimental work conducted by Bouix et al [9] enabled us to obtain a large dataset of stressestrain curves for different values of density (34e150 kg m À3 ) and for a large range of strain rates. A Zwick electromechanical testing machine was used for quasistatic compression tests where the strain rate was about to 10 À1 s À1 .…”

Section: Experimental Compressive Testsmentioning

confidence: 99%

“…Dynamic compressive tests were performed with the well-known Split Hopkinson Pressure Bars to reach strain rates of 10 3 s À1 . The experiments were completed using a Flywheel device for the intermediate strain rates [9,11].…”

Section: Experimental Compressive Testsmentioning

confidence: 99%

“…FE simulations of such loadings have been performed on virtual samples of foam including heterogeneous beads of variable properties. The material properties of this foam are obtained from the complete experimental study of Bouix et al [9] which gives the macroscopic behavior of the EPP material for several values of density and several values of strain rate.…”

Section: Introductionmentioning

confidence: 99%

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Impact on multi-layered polypropylene foams

Mahéo

Viot

2013

International Journal of Impact Engineering

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tFoams, and particularly the polypropylene foam, are more and more often used in the area of injury protection and passive safety for its energy absorption capacity. This multi-scale material is constituted of mesoscopic beads with a large variability of the material properties. To study the effects of these mesoscopic heterogeneities on both the macroscopic and the local behaviors, numerical simulations on virtual volumes of foam under dynamic loading have been performed. The influence of the organized system of heterogeneities has also been studied in the cases of a random distribution and a multi-layered volume. Experimental dynamic compressive tests have been performed on multi-layered volumes of foam and compared with the results of the Finite Element Method.

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Characterization of Energy Absorption and Strain Rate Sensitivity of a Novel Elastomeric Polyurea Foam

et al. 2020

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Elastomeric polymer foams are widely used in sports and other protective padding applications due to their unique properties, such as excellent cushioning and relatively high‐energy absorption to weight ratio. This work investigates the mechanical and energy absorption performance of an elastomeric hybrid structure polyurea foam in response to low‐velocity impact. The examined polyurea foams are synthesized using a novel self‐foaming process that leads to the development of a semi‐closed cellular structure. The quasi‐static response of the foam is first characterized by measuring the global stress–strain and energy absorption characteristics. The evolution of the foam's Poisson's ratio is also characterized by in situ digital image correlation (DIC) measurements. The same properties are also studied in dynamic loading conditions by subjecting the foam samples to controlled impact tests. A strain‐dependent rate sensitivity parameter is used to quantify differences between the quasi‐static and dynamic strength and energy absorption responses of the foam. The examined foam shows significant enhancement in strength at increased strain rates while retaining its excellent energy absorption capacity. This unique characteristic of the examined foam is discussed in terms of the concurrent effects of entrapped gas and the rate sensitivity of the parent polymer.

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Polypropylene foam behaviour under dynamic loadings: Strain rate, density and microstructure effects

Cited by 168 publications

References 40 publications

Dynamic crushing behaviour of agglomerated cork

Dynamic crushing behaviour of agglomerated cork

Impact on multi-layered polypropylene foams

Characterization of Energy Absorption and Strain Rate Sensitivity of a Novel Elastomeric Polyurea Foam

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