Dynamic fracture in PMMA was studied to determine the correlations among dynamic stress intensity factor K_(ID), crack velocity a and acceleration a. Specimen geom-etry, a single-edge-cracked tensile plate with two circular holes, was employed to obtain the crack acceleration, deceleration and re-acceleration process in a single fracture event. K_(ID) was evaluated using the method of caustics in combination with a Cranz-Schardin high-speed camera and correlated with a and a.
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