Abstract
When solid materials break under external forces, fast propagating cracks often appear and propagate at a speed more than several hundred meters per second. The fast propagating crack often bifurcates into two cracks, and it is necessary to measure the energy release rate of the bifurcating crack to figure out the mechanism of crack bifurcation. The present paper describes the Moire interferometiy used to develop the measurement method and high-speed holographic microscopy to measure the energy release rate of rapidly bifurcating cracks.
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