Experimental study on crack coalescence mechanisms of pre-existing flaws under blast loading

Zhong-wen Yue; Ren-shu Yang; Xin-min Ma; Dong-ming Guo

doi:10.1117/12.839056

27 August 2009 Experimental study on crack coalescence mechanisms of pre-existing flaws under blast loading

Zhong-wen Yue, Ren-shu Yang, Xin-min Ma, Dong-ming Guo

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73751C (2009) https://doi.org/10.1117/12.839056
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

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 K^d_II is smaller than that of dynamic stress intensity factor K^d_I. The results of the present research can provide the theoretical basis for the study on blasting of rock containing flaws.

Citation Download Citation

Zhong-wen Yue, Ren-shu Yang, Xin-min Ma, and Dong-ming Guo "Experimental study on crack coalescence mechanisms of pre-existing flaws under blast loading", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751C (27 August 2009); https://doi.org/10.1117/12.839056

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