›› 2009, Vol. 30 ›› Issue (4): 949-954.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Dynamic analysis of crack propagation in media containing flaws under the explosive stress wave

YUE Zhong-wen 1,2，YANG Ren-shu 1,2，GUO Dong-ming 1,2，CAO Hui1,2，DONG Ju-cai 1,2   

  1. 1. School of Mechanics & Civil Engineering, China University of Mining & Technology, Beijing 100083, China; 2. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Beijing 100083, China
  • Received:2008-03-02 Online:2009-04-10 Published:2011-01-30

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Abstract:

Using transmission caustics system, the crack propagation experiment of media containing prefabricated flaws under explosive stress wave is carried out. The varieties of dynamic stress intensity factor, crack extensions rate, crack extensions acceleration, and dynamic energy release rate in the crack tip of media containing flaw which is collinear with the borehole are studied. The relationship of them is analyzed. Experimental results show that two wing cracks appear at both ends of the flaw in media subjected to blasting loading. The wing crack A length is longer than wing crack B length. Tow wing cracks expand along reverse direction and are co-linear with prefabricated flaw. The cracking velocity and acceleration oscillated with the increase of crack propagating time. The dynamic stress intensity factor value reaches the maximum in a moment and then gradually decreases. The changes of dynamic stress intensity factor also presents oscillation in whole time. At the end, dynamic energy release rate drives crack extension.

Key words: explosive stress wave, media containing flaws, dynamic caustics, crack propagation, dynamic stress intensity factor, dynamic energy release rate

CLC Number: 

  • O 383
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