Summary
The optical method of caustics was used along with high speed photography to study crack propagation and crack-hole interaction in plane PMMA specimens containing a transverse edge crack and a hole lying eccentrically to its axis. The specimens were fractured under different dynamic loads.
Crack-hole interaction is characterized (for a limiting vertical distance of the crack axis from the center of the hole) by a process of attraction — repulsion of the crack towards the hole, interrupted by a momentary crack-arrest at the hole boundary. Increased values of crack propagation velocity and of the stress intensity factor at the tip of the propagating crack are detected during crack-hole interaction.
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Milios, J., Spathis, G. Dynamic interaction of a propagating crack with a hole boundary. Acta Mechanica 72, 283–295 (1988). https://doi.org/10.1007/BF01178314
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DOI: https://doi.org/10.1007/BF01178314