Abstract
High speed holographic microscopy is applied to take three successive microscopic photographs of rapidly bifurcating cracks in Araldite B. Crack tip positions are measured from the photographs, and the crack speeds before and after bifurcation are obtained by assuming that crack speeds are kept constant before and after the bifurcation respectively. Energy release rate is also obtained by measuring the crack opening displacement of the cracks on the photographs. The results say that there exists the discontinuity of crack speed at bifurcation, and the crack speed after bifurcation is slower than that before bifurcation. On the other hand, the energy release rate is continuous at the bifurcation, and increases gradually with crack extension.
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