Recompression of PMMA following shock induced tension

Bartkowski, Peter T.; Dandekar, Dattatraya P.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p539
Academic Journal
PMMA is inferred to deform like an elastic-plastic material under shock wave compression and release. This article presents evidence of an unusual recompression response of PMMA following its spallation under shock induced tension. The final recompressed state is attained through multiple wave propagations. The free surface velocity change associated with the first wave following spallation is 10-12 m/s. The final amplitude of the recompressed state decreases when the impact stress equals or exceeds 0.76 GPa. It is at this stress that evidence for the propagation of a third wave propagation appears to emerge. The origin of these multiple waves in PMMA under recompression following its spall remains unclear at present.


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