Abstract
The question of the domain of dominance of the plane-stress asymptotic elastic fields in dynamic fracture is addressed for the two cases of dynamically loaded stationary cracks as well as dynamically propagating cracks. The experiments reported in this work are on three-point bend, 4340 steel specimens loaded dynamically using a drop-weight tower. A new optical configuration is proposed which would allow for the simultaneous measurement of the apparent dynamic stress-intensity factor from two different regions around the crack-tip using the method of caustics. The results of the study indicate the importance of three-dimensional and transient effects in the interpretation of optical measurements.
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