Dynamic fracture experiments of specimens containing inclined crack under impact load

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (8) : 165-171.

ZHENG Changda1,YANG Liyun1,DING Chenxi1,CHEN Cheng1,XIAO Chenglong1,ZHAO Yong2

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Abstract:In order to clearly investigate the mechanism of radical cracks around a roadway under dynamic loading, dynamic fracture tests of PMMA specimens containing inclined crack were studied by using an impact loading platform of a drop hammer and the test system of digital laser dynamic caustics.The effect of changing the pre-crack angle α on the dynamic mechanical behavior was recorded.Through the caustics method and the fractal dimension method, the results show that: ① The pre-crack angle affects the speed of accumulation and release of the strain energy at the crack tip.As the angle increases, the crack initiation time becomes shorter, crack initiation becomes easier and the strain energy at the crack tip accumulates faster.② The releasing law of the strain energy at the crack tip are different on each side of α=45°.③The tendency of KdI-t is similar, but there is a difference in the maximum.④ The growth trajectory of cracks at different angles satisfies a certain fractal law.

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dynamic caustics / impact loading / flaw / dynamic stress intensity factor / crack propagation velocity / fractal dimension

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ZHENG Changda1,YANG Liyun1,DING Chenxi1,CHEN Cheng1,XIAO Chenglong1,ZHAO Yong2. Dynamic fracture experiments of specimens containing inclined crack under impact load[J]. Journal of Vibration and Shock, 2020, 39(8): 165-171

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