Energy Absorption Capacity of Agglomerated Cork Under Severe Loading Conditions
Article dans une revue avec comité de lecture
Understanding the mechanical behavior of materials in working conditions is a current problem in transport industries. In this article, we demonstrate why the temperature and the strain-rate are first-order parameters when studying the mechanical behavior of polymeric cellular materials with a glass transition temperature Tg in working temperatures. Compressive tests in quasi-static until a 0.5 hencky strain were conducted at several temperatures on agglomerated cork. Compressive tests were then conduted along a large range of strain rates, from 4.2 10−5 s−1 to 250 s−1 at room temperature (24 °C). Both parameters influence strongly the overall mechanical behavior with an opposite effect because of the polymeric nature of the constitutive materials. However discrepencies in the variation were observed between materials parameters of the two conditions (temperature and strain rate). In order to separate the dynamic effects from the modification of the stiffness of the constitutive materials with temperature or strain rate, a specific apparatus was designed to achieve high-strain rate tests in temperature. Compressive tests in dynamic regime were then conducted at −20 °C on agglomerated cork as a proof-of-concept. The experimental results (stress/strain curves and materials parameters) showed a great influence of the strain-rate and the temperature combined. Such apparatus will provide results allowing a more in-depth characterisation of the local mechanisms that will be precious for future simulations.
Files in this item
Showing items related by title, author, creator and subject.
Article dans une revue avec comité de lectureLE BARBENCHON, Louise; GIRARDOT, Jérémie; KOPP, Jean-Benoit; VIOT, Philippe (Elsevier, 2019)This study focuses on the microstructural aspects of a cork-based by-product known as agglomerated cork and its influence on the compressive mechanical behaviour. The material consists in granulates of a natural polymeric ...
Reinforcement of cellular materials with short fibres: Application to a bio-based cork multi-scale foam Article dans une revue avec comité de lectureLE BARBENCHON, Louise; KOPP, Jean-Benoit; GIRARDOT, Jérémie; VIOT, Philippe (Elsevier, 2020)A bio-sourced foam, agglomerated cork, was chosen to evaluate the influence of short fibres on the mechanical behaviour of cellular materials. The final material was obtained by mixing cork particles with a thermoset resin. ...
Study of the dynamic fracture of hollow spheres under compression using the Discrete Element Method Article dans une revue avec comité de lectureCORE, Arthur; KOPP, Jean-Benoit; GIRARDOT, Jérémie; VIOT, Philippe (ESIS - Elsevier, 2018)Hollow sphere structure (HSS) belongs to cellular solids that have been studied recently for its multiples properties. In our case, HSS aims to absorb soft impacts energy on an airliner cockpit. This structure is investigated ...
From bio-sourced to bio-inspired cellular materials: A review on their mechanical behavior under dynamic loadings Article dans une revue avec comité de lectureLE BARBENCHON, Louise; VIOT, Philippe (Elsevier BV, 2024-01)Natural cellular materials can be used directly or as a constituent of bio-sourced composites for industrial applications involving dynamic loadings, usually for the purpose of absorbing mechanical energy. These biological ...
Article dans une revue avec comité de lectureKOPP, Jean-Benoit; GIRARDOT, Jérémie (Scientific Research Publishing, Inc., 2021)The influence of temperature on the resistance to rapid crack propagation of a semi-crystalline bio-based polymer was studied. The experimental results described in this study allow to initiate a first discussion ...