Influence of the Shape of Explosive Charge on the Blast Wave Propagation

Yoo, Yo-Han; Choi, Youngsik; Lee, Joonwon; Yun, Kyung-Jae

doi:10.1051/matecconf/20165406001

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Therefore, the relationship between the pressure, density and sound velocity on the reflected wave front can be expressed as Eqn. (13,14) [14].…”

Section: Reflection Process Analysis Of Detonation Wavementioning

confidence: 99%

“…As one of the commonly used charge structures, there are few studies on the initial shock wave pressure characteristics of cylindrical charge. It may be because that the range of the sensor limits the underwater explosion load test, and it is difficult to directly obtain the accurate initial shock wave pressure [13]. Therefore, in order to more comprehensively describe the underwater explosion power of cylindrical explosives, it is meaningful to establish a two-dimensional axisymmetric theoretical model for the initial shock wave.…”

Section: Introductionmentioning

confidence: 99%

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Study on the characteristics of initial shock waves generated by cylindrical charge for underwater explosion

Wang

Liu

et al. 2023

J. Phys.: Conf. Ser.

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In order to provide a theoretical basis for studying the shock wave propagation and evolution generated by cylindrical charge of near-field underwater explosion, the characteristics of initial shock waves generated by cylindrical charge are studied. First, a new theoretical model for initial shock waves is proposed by the polar curve method. Based on the theoretical model and the simulated results, the influences of incident angle, length-to-diameter ratio and type of charge on the initial shock waves are analysed. Then the experiments of underwater explosion load tests are carried out to verify the theoretical and simulation results. Finally some instructive conclusions are drawn: i) The two-dimensional theoretical model can calculate the initial underwater shock wave pressure and its direction of cylindrical charge through detonation velocity, detonation pressure, explosive density and incident angle, which is provides a theoretical basic for studying the shock wave propagation and evolution studies. By comparing the theoretical results with the numerical results verified by experiments, the maximum error is not more than 9.93%. ii) Increasing the incident angle α 0 will reduce the initial shock wave pressure of cylindrical charge and make its direction deflect towards the material interface. When the incident angle α 0 is in the range of 0 - 10°, increasing the incident angle makes the initial shock wave pressure decrease rapidly as a power function. With the increasing of the incident angle, the attenuation rate of the initial shock wave firstly decreases and then increases when the incident angle α 0 is in the range of 10 - 72°. This phenomenon explains the reason that the axial and radial initial shock wave pressures are much higher than those in other directions after the central initiation of cylindrical charge. iii) According to the geometric relationship, the length-to-diameter ratio of the charge will limit the range of the incident angle. The length-to-diameter ratio will affect the initial shock wave pressure at the same initiation time. The pressure decreases with the increase of the length-to-diameter ratio when the initial shock wave is formed on the cylindrical surface of the charge.

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“…Therefore, the relationship between the pressure, density and sound velocity on the reflected wave front can be expressed as Eqn. (13,14) [14].…”

Section: Reflection Process Analysis Of Detonation Wavementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the characteristics of initial shock waves generated by cylindrical charge for underwater explosion

Wang

Liu

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…For the spherical explosion source, due to the spherical symmetry of the explosion load, the problem can be simplified to a one-dimensional problem, and the solution of the problem can be obtained through analytical calculation [7] so that the relationship between the vibration spectrum and the radius of the plastic zone can be analyzed and obtained. However, for cylindrical charge, the analytical solution of its dominant frequency is difficult to obtain due to the influence of many factors such as charge structure, explosion energy release form, and free surface [8,9].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Relationship between the Dominant Frequency of Blasting Vibration and the Development of Plastic Zone in Cylindrical Charge

Zhao

Gao

et al. 2022

Geofluids

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Blasting vibration is a widely studied harmful effect of rock blasting excavations. Many factors affect its dominant frequency, which makes analyzing, evaluating, and predicting it difficult. This study explored the factors influencing the dominant frequency of blasting vibrations in the case of a spherical charge. Based on symmetry, a theoretical analysis in terms of a spherical explosion source is generally sufficient to describe a cavity excited by a spherical explosion charge. The elastic cavity radius and the dominant frequency of vibration induced by the spherical blasting source are closely related. However, there is a lack of relevant research on cylindrical charges. Therefore, a calculation model for a single-hole cylindrical charge was established. There is a relationship between the corresponding dominant frequency and the range of the plastic zone. The results indicate that the dominant frequency of the blasting vibration for both cylindrical and spherical charges is closely related to the range of the plastic zone formed by the rock blasting. As the elastic cavity radius increases, both the zero-crossing and the dominant Fourier frequencies decrease, and the amplitude spectrum shifts to lower frequencies. However, increasing the cylindrical charge diameter causes more changes in the plastic zone in the direction perpendicular to the cylindrical explosive axis. Moreover, increasing the charge length causes more changes in the plastic zone along this axis. It is therefore difficult to identify a unique dimensional parameter that characterizes the range of the plastic zone formed by the blasting. Because the plastic zone around a cylindrical charge is less regular than around a spherical charge, the charge weight Q is a more favorable parameter than the elastic cavity radius a when used as the main influencing factor and in an attenuation analysis for the dominant frequency of cylindrical charge blasting.

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Blast loading model of the RC column under close-in explosion induced by the double-end-initiation explosive cylinder

Chen

Fang

et al. 2018

Engineering Structures

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Influence of the Shape of Explosive Charge on the Blast Wave Propagation

Cited by 3 publications

References 5 publications

Study on the characteristics of initial shock waves generated by cylindrical charge for underwater explosion

Study on the characteristics of initial shock waves generated by cylindrical charge for underwater explosion

Numerical Study on the Relationship between the Dominant Frequency of Blasting Vibration and the Development of Plastic Zone in Cylindrical Charge

Blast loading model of the RC column under close-in explosion induced by the double-end-initiation explosive cylinder

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