On the effect of asymmetries on the jet from a linear shaped charge

Seeking the law of through-crack in the double hole of shaped charge can help reveal the rock failure mechanism of directional controlled blasting. Using LS-DYNA numerical simulation analysis, the dynamic mechanical behaviors of double-hole crack development and double-hole crack penetration in elliptical bipolar linear-shaped charge blasting and ordinary blasting were compared and studied. The results showed that it was difficult to form a straight line through the double holes under ordinary blasting, while easy to cause over-under-excavation problems. The blasting of the elliptical bipolar linear-shaped charge had a significant effect on the formation of directional crack. The crack penetrated along the connecting center line of the two holes. The main crack growth form was tensile fracture mode, and the explosion gas was the important driving force for continuous crack growth. The elliptical bipolar linear-shaped charge blasting produced fewer cracks in the nonenergy-accumulating direction, which could effectively reduce the damage of the retained rock mass.

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Penetration and Cutting Effects of Lead-Sheathed Flexible Linear Shaped Charges and Explosive-Filled Linear Shaped-Charge Containers (Mark 7 Mods 1 through 8 and Mark 8 Mod 2)

10.21236/adb032093 ◽

1978 ◽

Author(s):

William A. Humphrey ◽

Paula A. Gaines

Keyword(s):

Shaped Charge ◽

Linear Shaped Charge

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J191034 Experimental Study of Cutting and Breakup Performance by Linear Shaped Charge

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2011._j191034-1 ◽

2011 ◽

Vol 2011 (0) ◽

pp. _J191034-1-_J191034-3

Author(s):

Hidehiro HATA ◽

Tetsuyuki HIROE ◽

Kazuhito FUJIWARA

Keyword(s):

Experimental Study ◽

Shaped Charge ◽

Linear Shaped Charge

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Study on Penetration Performance of Precision Linear Shaped Charge

Journal of the Korean Society for Aeronautical & Space Sciences ◽

10.5139/jksas.2019.47.6.397 ◽

2019 ◽

Vol 47 (6) ◽

pp. 397-404

Author(s):

Si-Eun Lee ◽

Juho Lee ◽

Mi-Ae Moon

Keyword(s):

Shaped Charge ◽

Linear Shaped Charge

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Design of a Novel Linear Shaped Charge and Factors Influencing its Penetration Performance

Applied Sciences ◽

10.3390/app8101863 ◽

2018 ◽

Vol 8 (10) ◽

pp. 1863 ◽

Cited By ~ 3

Author(s):

Xi Cheng ◽

Guangyan Huang ◽

Chunmei Liu ◽

Shunshan Feng

Keyword(s):

Structural Design ◽

Apex Angle ◽

Shaped Charge ◽

Jet Formation ◽

Depth Of Penetration ◽

Eulerian Model ◽

Steel Target ◽

Linear Shaped Charge ◽

Better Than ◽

Good Agreement

In this paper, a novel linear shaped charge (LSC), called a bi-apex-angle linear shaped charge (BLSC), has been designed to investigate the improvement of penetration performance. Compared with a traditional single-apex-angle LSC, a BLSC, which consists of a small-apex-angle liner and a large-apex-angle liner, has been investigated by depth-of-penetration (DOP) test. The results show that the penetration depth of BLSC is 29.72% better than that of an ordinary LSC. An Eulerian method is applied to simulate the entire process of jet formation, as well as penetration on a #45 steel target. The effectiveness of the Eulerian model is demonstrated by the good agreement of the computational results with experimental observations. Furthermore, the numerical simulation is developed to investigate the influence of liner thickness, explosive type, combination of small and large apex angle, ratio of small to all apex angle liner, and standoff distance on the penetration performance of BLSCs. The suggested work and results can provide a guide and reference for the structural design of BLSC.

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