Abstract
In this paper, the fracture characterization of a V-notch tip in PMMA material is studied by means of an optical caustics method. The initial curve and caustic curve of the notch tip with different notch angles are simulated. Some typical stress concentration characterizations at the notch tip are analyzed. Fracture experiments of PMMA specimens with a V-notch subjected to three-point-bend loading are visualized using the optical pattern of caustics. The evolution of the stress intensity factor and the size of the caustic spot at the notch tip are analyzed. These results will be useful for the reliable design and strength evaluation of engineering structures with complex notch shapes.
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