THE RAMPING OF SHOCK-WAVES IN 3 GLASSES

We present experimental stress histories for shock loaded glass specim ens which show that their response is strongly dependent on the glass structure. Soda-lime glass shows a clear ramping behaviour in the 0-4. 3 GPa range which was not been observed before. We believe that this r amping is a consequence of decreasing elastic moduli with pressure, as is the case with the more open structured glasses like borosilicate a nd fused silica. A much denser glass shows no ramping in its response to planar shock loading, confirming the relationship between ramping a nd the open structure of glasses.