Abstract
In this paper we review recent theoretical and experimental developments related to the investigation of dynamic and transient crack-tip deformations using a new coherent optical technique— coherent gradient sensing (CGS). CGS is a full-field, lateral-shearing interferometric technique with an on-line spatial filter. This full-field optical method has been used both in transmission and reflection modes to study deformations in transparent as well as opaque solids. Its ability to produce fringes in real time is used advantageously to map dynamic crack-tip deformations in PMMA and AISI- 4340 steel specimens as well as in bimaterial combinations of PMMA/Al and PMMA/steel. The technique measures either in-plane stress gradients (transmission) or out-of-plane displacement gradients (reflection).
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