Freehyphen;surface velocity measurement of shockhyphen;compressed alumina powder compact using a Fabryndash;Perot interferometer

摘要

A Fabryndash;Perot interferometer system was used to measure the freehyphen;surface velocity of agr;hyphen;alumina powder compact.Insitupressure profile measurements using a pair of manganin gauges were also carried out to clarify the compaction process during compression and stress release. The Fabryndash;Perot system indicates that the reflectivity of the free surface of the powder material does not significantly change during the stress release process. An observed feature of the powderrsquo;s stress release curve as determined by the manganin gauge suggests the existence of the residual voids in the shock compressed powder matrix even in the high shock pressure regime.