29 January 2007 Crack propagation imaging by the ISIS camera and a video trigger system
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Abstract
An ultra-high speed camera of 1Mfps was applied to visualize the crack propagation. Change of stress field around the propagating crack tip was captured as a change of the fringe pattern by means of the photo-elastic imaging technique. Newly developed video trigger system is employed to detect the occurrence of the crack propagation as a trigger in the experiment. The trigger successfully perceived the initiation of the crack propagation stably. Also its response time was fast enough even for the image capturing with 1Mfps. As a result, it is revealed that the elastic wave, propagating in the continuous body, has a significant effect on the velocity and kinking behavior of the propagating crack.
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Tomoo Okinaka, Pavel Karimov, Takeharu Etoh, Kenji Oguni, "Crack propagation imaging by the ISIS camera and a video trigger system", Proc. SPIE 6491, Videometrics IX, 64910Y (29 January 2007); doi: 10.1117/12.703310; https://doi.org/10.1117/12.703310
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