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Proceedings Paper

Experimental study on crack coalescence mechanisms of pre-existing flaws under blast loading
Author(s): Zhong-wen Yue; Ren-shu Yang; Xin-min Ma; Dong-ming Guo
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Paper Abstract

The PMMA model transmission-type experiment of dynamic caustics was carried out to simulate the fracture blasting process of material containing pre-existing flaws using the dynamic caustic-test system. The mechanism of the fracture coalescence among four prefabricated flaws with echelon geometry distribution was studied under blast loading. The experiment results show that two wing cracks respectively coalescing with the flaw F2 and flaw F3 appear at both tips of the flaw F1 closest to the blasthole. Whereas the flaw F4 doesn't produce wing cracks, the flaw F2 and flaw F3 also respectively generate two wing cracks which don't link up the flaw F4. Crack propagation is greatly affected by preexisting flaws. During the whole fracture process, the wing crack velocity oscillates with the increase of crack propagating time. The value of dynamic stress intensity factor reaches the maximum in a moment and then gradually decreases. The changes of dynamic stress intensity factor also oscillate in the whole time. Furthermore, the value of dynamic stress intensity factor KdII is smaller than that of dynamic stress intensity factor KdI. The results of the present research can provide the theoretical basis for the study on blasting of rock containing flaws.

Paper Details

Date Published: 27 August 2009
PDF: 7 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751C (27 August 2009); doi: 10.1117/12.839056
Show Author Affiliations
Zhong-wen Yue, China Univ. of Mining and Technology (China)
Ren-shu Yang, China Univ. of Mining and Technology (China)
Xin-min Ma, China Univ. of Mining and Technology (China)
Dong-ming Guo, China Univ. of Mining and Technology (China)


Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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