冲击荷载下缺陷介质裂纹扩展的DLDC试验

doi:10.13722/j.cnki.jrme.2014.10.004

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Abstract The dynamic behavior of crack propagation due to the impacting of drop hammer on the defective medium of manufactured crack(inclination angle，respectively，for the 0°，30°，45°) was analyzed using the test system of digital laser dynamic caustics(DLDC). Under the action of the impact loading，the cracks started from one side of the existing crack，then extended to the whole specimen，and the path pointed to the contact point of drop hammer. of the main crack oscillated till the occurring of the first peak. It decreased and then increased to the maximum value when the main crack began to propagate. of the wing crack oscillated before propagation，then quickly increased to the maximum value and decreased thereafter. The velocity of the main crack decreased quickly after propagation. The main crack initiation delayed.

Key words： blasting mechanics impact loading defective medium dynamic caustics digital laser

Received: 20 June 2014

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.10.004 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I10/1971

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