Abstract
Polymeric cellular materials are used in many different application domains such as transport, sport, food, health and energy. Therefore, the conditions of use of these materials represent wide temperature and strain-rate ranges. The mechanical behaviour of these foams demonstrate a strong dependency to it. In order to be able to predict such dependency, its origin has to be better understood. For this study, a bio-based cellular material, agglomerated cork, has been chosen to evaluate the temperature and strain-rate dependency of the mechanical behaviour. The visco-elastic behaviour of the material was first studied between −80°C and 100°C at frequencies between 0.01 Hz and 100 Hz. The compressive mechanical behaviour was then studied on a large range of temperature (from −30°C to 100°C) and strain rates (from 4.2 10−5 s−1 to 1250 s−1). A specific set-up was finally used to operate dynamic tests at low and high temperature. These results were used to discuss the evolution of the mechanical beahviour with these environnemental conditions based on the knowledge of the mechanical behaviour of the constitutive materials.
Highlights
The demand for lighter and bio-sourced materials is currently increasing because of emerging concerns about global warming
Between 60 and 100°C, it is even negligible. For this kind of cork agglomerates, 20°C is considered to be the glass transition temperature Tg [8], which is the temperature at which the modification of the mechanical behaviour in the α-transiton in maximal
A large range of strain-rates and temperatures were imposed to cork agglomerate samples
Summary
The demand for lighter and bio-sourced materials is currently increasing because of emerging concerns about global warming. Cork presents a large set of properties (fire resistant, impact absorbing, phonic isolation ...) due to its foam structure and polymeric composition [1] It is an excellent candidate for a wide range of application domains. An increase in macroscopic stresses was usually noted with the increase in the initial strain-rate as have shown several impact tests achieved with a drop tower [2,3,4,5]. This kind of loading coupled with temperature variation shows no important changes in the mechanical behaviour between 21°C and 50°C [6]. Another study reports that between −30°C and 100°C, an important decrease in the absorbed energy during an impact is observed when the temperature increases [7]
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