The interaction between blasting crack and circular hole at different offset distances in PMMA

To investigate the interaction between blasting crack and circular hole with various offset distances in PMMA, this study examined the propagation and arrest mechanisms of blasting crack utilizing a dynamic caustics experimental system. When the offset distance (d) ≥ 8 mm, the circular hole had a negligible effect on crack propagation. When d = 6 mm, the velocity and mode I stress intensity factor of the crack propagating near the circular hole were significantly reduced. The circular hole exerted a notable hindering effect on the blasting crack, however, it did not completely arrest the crack propagation. The crack initially approaches and subsequently moves away from the circular hole. When d ≤ 4 mm, the crack stoped at the circular hole.