Abstract
Pulsed holographic microscopy is applied to take an instantaneous microscopic photograph of the neighborhood of a crack tip propagating in a PMMA plate specimen at a speed of several hundred meters per second. From the photograph, crack opening displacements (COD) are measured in the vicinity of the crack tip, and the dynamic fracture toughness KID is calculated through the formula of COD in the singular stress field of a propagating crack. Two types of optical systems are used for holographic recording of cracks. The values of KID obtained through one optical system are in agreement with those obtained through the other. One of the holographic optical systems can simultaneously record the caustic of a fast propagating crack at a moment when the crack tip is recorded as a hologram. The value of KID caluculated from COD measurement is roughly in agreement with that from the caustic method.
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