On the dynamic behaviour of porous materials

The mechanical properties of porous materials are strongly influenced by th e stress concentration around pores. In view of this, stress fields around a spheroidal pore is studied under dynamic loading conditions. A hybrid met hod that combines the finite element method with an analytical approach has been used. It is shown that the dynamic stress concentration is influenced by three parameters: frequency of excitation, geometry of the pore and Poi sson's ratio of the medium. It is also shown that the dynamic stress concen tration can reach much higher values than that predicted by static analysis . (C) 2000 Published by Elsevier Science Ltd. All rights reserved.