Polypropylene foam behaviour under dynamic loadings: Strain rate, density and microstructure effects
Article dans une revue avec comité de lecture
Expanded polypropylene foams (EPP) can be used to absorb shock energy. The performance of these foams has to be studied as a function of several parameters such as density, microstructure and also the strain rate imposed during dynamic loading. The compressive stress–strain behaviour of these foams has been investigated over a wide range of engineering strain rates from 0.01 to 1500 s 1 in order to demonstrate the effects of foam density and strain rate on the initial collapse stress and the hardening modulus in the post-yield plateau region. A flywheel apparatus has been used for intermediate strain rates of about 200 s 1 and higher strain rate compression tests were performed using a viscoelastic Split Hopkinson Pressure Bar apparatus (SHPB), with nylon bars, at strain rates around 1500 s 1 EPP foams of various densities from 34 to 150 kgm 3 were considered and microstructural aspects were examined using two particular foams. Finally, in order to assess the contribution of the gas trapped in the closed cells of the foams, compression tests in a fluid chamber at quasi-static and dynamic loading velocities were performed.
Fichier(s) constituant cette publication
Cette publication figure dans le(s) laboratoire(s) suivant(s)
Visualiser des documents liés par titre, auteur, créateur et sujet.
Communication avec acteGUILLAUD, Nicolas; FROUSTEY, Catherine; DAU, Frédéric; VIOT, Philippe; LATAILLADE, Jean-Luc (2013)This study concerns Carbon / epoxy composite plates. Three di erent thickness were investigated ([0°=45°=90°=45°]i)S for i = 2, 3 or 4 (5, 10 and 15mm thick). An instrumented falling-weight-impact test machine was used for ...
Article dans une revue avec comité de lectureBALLERE, Ludovic; VIOT, Philippe; LATAILLADE, Jean-Luc; GUILLAUMAT, Laurent; CLOUTET, S (Elsevier, 2008)The final aim of this study is to evaluate the influence of impact damage on the residual strength of carbon/epoxy vessels stressed by internal pressure. An intermediate stage determined the residual behaviour of pre-impacted ...
Article dans une revue avec comité de lectureVIOT, Philippe; BALLERE, Ludovic; GUILLAUMAT, Laurent; LATAILLADE, Jean-Luc (Elsevier, 2008)For several years, composite materials have taken a significant part in the realization of structures designed for transport (aeronautical, nautical, automotive. . .). In order to qualify the behavior of such structures, ...
The influence of acrylate triblock copolymer embedded in matrix on composite structures’ responses to low-velocity impacts Article dans une revue avec comité de lectureDENNEULIN, Sébastien; VIOT, Philippe; LEONARDI, Frédéric; LATAILLADE, Jean-Luc (Elsevier, 2012)In passive safety structures the use of composite materials has increased significantly recently due to their low specific mass and high energy absorption capacities. The purpose of this experimental study is to describe ...
Experimental Investigation and Discrete Element Modelling of Composite Hollow Spheres Subjected to Dynamic Fracture Article dans une revue avec comité de lectureCORE, Arthur; KOPP, Jean-Benoit; VIOT, Philippe; CHARLES, Jean-Luc; DAU, Frédéric (Hindawi Publishing Corporation, 2017)This paper deals with the characterization and the numerical modelling of the collapse of composite hollow spherical structures developed to absorb energy during high velocity impacts. The structure is composed of hollow ...