Expanding law of cracks formed by slotted cartridge blast under unidirectional confining pressure

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 186-195.

YUE Zhongwen1,2, TIAN Shiying1, ZHANG Shichun1, ZONG Liangliang1,XU Shengnan1

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Abstract

In order to study dynamic mechanical behavior of main cracks formed by slotted cartridge blast under unidirectional confining pressure, a new digital-laser dynamic caustic line test system was used to perform multi-set blast light-measurement tests.At the same time, the FE software ANSYS/LS-DYNA was used to analyze effects of initial pressure on the blast stress field.The results showed that crack propagation direction and expanding length are controlled by combined action of slit angle and confining pressure; when pressure is vertical or parallel to direction of slit, combined action can suppress or boost initiation and evolution of main cracks formed by blast, and reduce or raise crack expanding speed and dynamic stress intensity factor; when pressure is at a certain angle with slit, main cracks tend to expand in pressure direction and dynamic mechanical parameters decrease; when unidirectional pressure is vertical or parallel to direction of slit, initial confining pressure static loading produces compression or tension stress in circumferential direction to reduce or raise tensile action of blast impact in circumferential direction, and reduce or raise blast load’s impact and crack-forming ability.

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slotted cartridge / confining pressure / dynamic caustic line / numerical simulation

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YUE Zhongwen1,2, TIAN Shiying1, ZHANG Shichun1, ZONG Liangliang1,XU Shengnan1. Expanding law of cracks formed by slotted cartridge blast under unidirectional confining pressure[J]. Journal of Vibration and Shock, 2019, 38(23): 186-195

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