scholarly journals Study on Dynamic Evolution Law of Blasting Cracks in Elliptical Bipolar Linear Shaped Charge Blasting

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bo Wu ◽  
Shixiang Xu ◽  
Guowang Meng ◽  
Junhua Cai ◽  
Han Wei ◽  
...  
Keyword(s):  
Main Crack ◽  
Laboratory Tests ◽  
Crack Formation ◽  
Simulation Analysis ◽  
Blast Hole ◽  
Shaped Charge ◽  
Dynamic Evolution ◽  
Remarkable Effect ◽  
Linear Shaped Charge ◽  
Decoupling Coefficient

Based on LS-DYNA numerical simulation analysis and comparison with laboratory tests, the blasting crack development dynamic evolution mechanism of elliptical bipolar linear shaped charge is analyzed. The development law of rock crack and optimal radial decoupling coefficient under different blast hole diameters were studied. The results revealed that the blasting with elliptical bipolar linear shaped charge had a remarkable effect on the directional crack formation, and the maximum effective stress of rock close to the position of shaped charge in the direction of concentrating energy is about 2.3 times of that in the direction of nonconcentrated energy. Moreover, the directional crack could be formed by blasting with elliptical bipolar linear shaped charge with different hole diameters, whilst the length of the main crack was related to the radial decoupling coefficient. Particularly, the main crack reached the longest when the radial decoupling coefficient was 3.36.

scholarly journals Study on the Dynamic Evolution of Through-Crack in the Double Hole of Elliptical Bipolar Linear-Shaped Charge Blasting

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Bo Wu ◽  
Shixiang Xu ◽  
Guowang Meng ◽  
Yaozhong Cui ◽  
Junhua Cai ◽  
...  
Keyword(s):  
Crack Growth ◽  
Growth Form ◽  
Simulation Analysis ◽  
Shaped Charge ◽  
Tensile Fracture ◽  
Mechanical Behaviors ◽  
Crack Penetration ◽  
Straight Line ◽  
Linear Shaped Charge ◽  
Continuous Crack

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.

Regularities of main crack formation in heterogeneous materials

2020 ◽  
Author(s):  
Ekaterina Damaskinskaya ◽  
Vladimir Hilarov ◽  
Ivan Panteleev ◽  
Dmitry Korost
Keyword(s):  
Main Crack ◽  
Crack Formation ◽  
Heterogeneous Materials

Titan IVB Linear-Shaped Charge Assembly Explosive Train Transfer Reliability

AIAA Journal ◽  
2003 ◽  
Vol 41 (7) ◽  
pp. 1304-1313 ◽  
Author(s):  
Lien C. Yang ◽  
Ian P. H. Do
Keyword(s):  
Shaped Charge ◽  
Linear Shaped Charge

The Impact on the Pier of Shaped Charge Ice-Breaking and Numerical Simulation Analysis

2014 ◽  
Vol 501-504 ◽  
pp. 1883-1887
Author(s):  
Wen Yuan Meng ◽  
Jia Qing Li ◽  
Ying Kui Guo ◽  
Guan Chao Xu ◽  
Jun Wei Guo
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Maximum Stress ◽  
Simulation Analysis ◽  
Shaped Charge ◽  
Ice Water ◽  
The Impact

In the process of shaped charge ice-breaking , the response of piers is great under the impact of air, ice, water etc, and relates to integral security of the bridge. For the impact on the pier with burst points of the different distances is simulated by ANSYS / DYNA software, summarizes the impact on the pier of shaped charge ice-breaking, and obtains the maximum stress curves of the pier at different distances. Simultaneously, the paper analyses critical damaging- model of the C30 reinforced concrete piers in detail. The conclusion has a major role in guiding when shaped charge ice-breaking appears.

Evaluation of Crack Formation in Concrete and Basalt Specimens under Cyclic Uniaxial Load Using Acoustic Emission and Computed X-Ray Tomography

2016 ◽  
Vol 722 ◽  
pp. 247-253 ◽  
Author(s):  
Alexander N. Kravcov ◽  
Pavel Svoboda ◽  
Adam Konvalinka ◽  
Elena B. Cherepetskaya ◽  
Ivan E. Sas ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Main Crack ◽  
Crack Formation ◽  
Acoustic Emission Activity ◽  
X Ray ◽  
Stress Memory ◽  
Uniaxial Load ◽  
Computed Microtomography ◽  
Emission Activity ◽  
X Ray Computed

The paper discusses the use of acoustic emission, stress-memory effect, and X-ray computed microtomography (μST) to detect the onset of destruction of specimens of concrete and basalt which are widely used in construction. It is shown that the most informative parameter is acoustic emission activity based on which the onset of the formation of a main crack can be identified. The geometry of the crack is determined using computed X-ray tomography.

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

1990 ◽  
Vol 67 (11) ◽  
pp. 6701-6704 ◽  
Author(s):  
D. C. Pack ◽  
J. P. Curtis
Keyword(s):  
Shaped Charge ◽  
Linear Shaped Charge

Numerical Simulation Analysis on Explosion Stress Field of Different Charge Construction

2011 ◽  
Vol 250-253 ◽  
pp. 2612-2616 ◽  
Author(s):  
Qi Zong ◽  
Lu Ping Yan ◽  
Hai Bo Wang
Keyword(s):  
Numerical Simulation ◽  
Stress Field ◽  
Simulation Analysis ◽  
Blast Hole ◽  
Peak Stress ◽  
Wall Pressure ◽  
Energy Utilization ◽  
Good Energy ◽  
Maximum Water ◽  
Simulation Results

There are different blasting stress field which around the blast hole caused by different charge when explosives exploded in the rock. Simulation analysis on borehole wall pressure and explosion stress field of rock at different charging structure was done by ANSYS/LS-DYNA. The simulation results indicate: stress of coupling charge is the maximum, water-decouple charge is the latter and air-decouple charge is the minimum; and whether air-decouple or water-decouple charge, peak stress value of model decreased along with the increasing of decouple coefficient, but the air-decouple charge show more obvious. Therefore, water-decouple blasting has good energy utilization.

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