Energy release rates and crack velocities during fracture experiments are derived from full-field measurements using Williams’ series expansion. For the first time, such material/structural cyclic fracture behavior is examined through the lens of linear elastic fracture mechanics (LEFM) by using in-situ High-Speed (HS) DIC. Here, loops of successive quasi-static and dynamic crack propagation are found within a single fracture experiment suggesting a ‘forbidden’ velocity regime. With TDCB-shaped samples and under a range of constant extension rates, the phenomenon of alternate cracking is observed. PMMA is known to show a great variety of fracture behaviors by even small changes in loading conditions. The alternate (stick-slip) cracking phenomenon in Poly(methyl methacrylate) (PMMA) was investigated using high-speed imaging and digital image correlation (DIC).
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