Abstract
Semi-Circular Bending (SCB) specimens are widely used in fracture analysis of geo materials due to their simple geometry and loading condition, and also the ability of introducing complete combinations of mode I and mode II fracture. Here SCB specimens of Poly (methyl methacrylate) (PMMA) with different pre-crack angles and positions were employed. An optical method of caustics was applied to calculate the crack initiation, crack propagation, stress intensity factor and fracture toughness, etc. Considering the dynamic crack propagation, the initial curve and caustic pattern in mixed mode fracture were deduced. Then the dynamic fracture parameters could be determined by measuring the caustic patterns obtained by a high speed camera and the specimen geometry. Moreover, we also compared the fracture mode of different pre-crack angles and positions. Finally, the interaction between cracks was also investigated by using this optical method. Results showed that the fracture mode of SCB specimen can be adjusted by pre-crack position and angle.
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