On the Modelling of Wave Phenomena in Permeable Foam
The linear Biot theory for wave propagation in porous media is applied to waves in open-cell permeable foam. The reflection of a weak shock wave from a semi-infinite elastic foam is considered. It is shown that the deformation of the foam and the related effective stress are caused by friction. The non-linear permeability and stress-strain relation of a flexible polyurethane foam is investigated. An example is shown of the reflection of a weak shock wave with Mach number 1.04 from a slab of foam adjacent to a solid wall. Both end-wall pressure and effective stress are measured. A partial mechanical collapse of the foam is observed.
Key wordsPermeable foam Wave phenomena
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