抄録
Cellular materials such as polymeric foams are often used for the development of composite materials as core in sandwich structures. Their use in the aircraft, naval, or automotive industries does not cease increasing by the way of their lightness and their great capacity to absorb energy. Generally used under a large range of strain rates the behavior of these materials must be identified in experiments before being integrated in finite element codes. The structural response of these foams strongly depends on their density, their cell structures, and the solid material properties. The viscoelastic nature of the solid polymer is, such as the gas trapped in the closed-cells, responsible of the sensitivity of the foam behavior. A viscoelastic Split Hopkinson Pressure Bar (SHPB) apparatus is used to perform tests at high strain rates.
