Full‐field Peak Pressure Prediction of Shock Waves from Underwater Explosion of Cylindrical Charges

Liu, Lei; Guo, Rui; Gao, Ke; Zeng, Ming Chao

doi:10.1002/prep.201700070

Cited by 12 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The impulse is close to being spherically symmetric while the EFD exhibits asymmetry about the charge. General trends agree with similar studies conducted in literature [23,37].…”

Section: Methodssupporting

confidence: 92%

“…The EFD is slightly less for the cylindrical solution. Again, these results are in agreement with general trends observed in literature [23,37]. We conclude that the use of spherical solutions is justified provided that gauges are located on the radial axis (90°in Figure 3) and have shown that the distances from the charge in Table 5 are compatible with this approach.…”

Section: Methodssupporting

confidence: 90%

“…Departures from the spherical shock wave approximation become significant at closer distances, where the shape and orientation of the explosive source in-creasingly affects the magnitude and angular variation of shock wave parameters. Methods have been developed to map the orientational peak pressure performance of a cylindrical charge of given Length to Diameter (L/D) ratio to that of an equal mass spherical charge [23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Milne

Burn

Carr

et al. 2021

Propellants Explo Pyrotec

View full text Add to dashboard Cite

We present here a coupled experimental and numerical modelling study to compare the underwater performance of different explosive charge types in simple geometries with a view to having confidence in the use of these models in the design of more complex warheads. Numerical modelling is used to predict the shock and bubble performance of underwater detonated charges and is intended to be used for comparison of the performance of different charge compositions. Model predictions are compared to experimental data from the underwater deto-nation of 1 kg cylindrical charges. It is shown that a simple 1D spherical geometry Eulerian hydrocode solution is suitable for comparison of the performance of different charge types provided that gauges are located on the radial axis of the charge and located a sufficient distance from the charge. Predictions using our chosen explosive models are shown to accurately capture the shock and bubble performance of ideal and non-ideal charges tested and the effects of charge casing so that these models can be used in more complex warhead design studies at a later date.

show abstract

“…The impulse is close to being spherically symmetric while the EFD exhibits asymmetry about the charge. General trends agree with similar studies conducted in literature [23,37].…”

Section: Methodssupporting

confidence: 92%

Section: Methodssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Milne

Burn

Carr

et al. 2021

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…Usually, if the bubble oscillates at a very close distance near the surface of the structure or free surface, either the bubble motion cycle or the maximum bubble radius will be much affected , the bubble will be rejected at the expansion stage, and be drawn at the collapse stage, and a water jet will form ,which can be explained by the Bjerkness effect [31].While, in most cases of this work, the test distance and water depth was much bigger than the maximum bubble radius (Fig. 7), namely, / > 2 and / > 2, so, the experiment condition can be approximately treated as mid-field or far-field underwater explosion [32]. Mu [33] applied MSC.…”

Section: Input Shock Loadingmentioning

confidence: 72%

Centrifuge experiment and numerical study on the dynamic response of air-backed plate to underwater explosion

Wu¹,

Long²,

Zhong³

et al. 2017

J. vibroeng.

View full text Add to dashboard Cite

This work compares experimental and numerical results concerning the elastic dynamic response of air-backed plate to underwater explosion. Experiments were performed in a centrifuge, both the shock loadings and structure responses were tested, and the bubble oscillation considering centrifugal force was predicted with Geer and Hunter model. The experimental and numerical results illustrates that the centrifugal force have no effect on shockwave for the short duration of action, and with the increase of centrifugal force, the bubble pulse motion cycle, maximum bubble radius, and peak pressure of bubble pulse decreased; both the peak of high-frequency and low-frequency response of the plate decline slightly when alpha damping rising ,the high-frequency response mode almost have no change with different alpha damping ,while, the low-frequency response tends to be an obvious oscillation waveform when the alpha damping is too low; although the difference of the peak acceleration owing to shock wave and bubble reaches to tens of times, the strain responses caused by the two factors are very close, which enucleates that the train response is related to shock energy and has a higher sensitivity to time accumulation; both the peak acceleration and peak strain due to the shock wave remain steady and the two kinds of response by bubble pulse decrease with the centrifugal force increasing; when the target position is more close to the area that the shock wave vertically impact ,the linear correlation between peak velocity and shock factor is much better.

show abstract

“…Xiao et al [24] improved the compressible nonspherical bubble dynamics model and explored the influence of bubble initial conditions in the free field and gravitational field on bubble dynamics. Liu et al [25] used numerical calculations and indirect mapping methods to study the similarities, differences, and relationships between spherical and cylindrical charges in underwater explosions and verified them through experiments. Ming et al [26] used the SPH method to study the shock wave load characteristics near the underwater explosive charge and proposed a SPH-FEM method to study the dynamic nonlinear behavior of ship structures under the action of underwater explosions.…”

Section: Introductionmentioning

confidence: 99%

Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion

Chen²,

Wang

et al. 2021

Shock and Vibration

View full text Add to dashboard Cite

Shock wave and bubble pulsation caused by underwater explosion destroy the hydraulic structure. However, the realization of the underwater explosion prototype test is restricted by many factors, such as the site environment. Furthermore, the repeatability of the test scheme is not strong. The centrifuge scale test provides a new way of studying the damage degree of the structure under the action of underwater explosion. The similarity relationship refers to the bridge between the scaled model and the prototype, which cannot achieve complete similarity in practice. The centrifuge-scaled model test is performed by increasing the acceleration of a certain multiple. Meanwhile, the model reduces the corresponding ratio in the geometric layout to achieve the geometric similarity with the prototype test. Therefore, the applicability of the centrifuge scaling method in the study of the dynamic response of the structure in underwater explosion needs to be explored further. In this work, the underwater explosion scaling test numerical model for 1 g RDX (equivalent to 1.62 g TNT) charge under different centrifugal acceleration conditions is established, and the calculation results of underwater pressure and dynamic response of the steel plate are compared with the centrifuge test results. A prototype model is established to study the similarity relationship between the centrifuge scale test and the prototype model when the steel plate structure is in the stage of small deformation and linear elasticity. The application of the similarity ratio in the scale test of underwater explosion the centrifuge is discussed. The application of the centrifuge in the study of the failure response of the hydraulic structure in underwater explosion is expanded by establishing the model and comparing with the experimental results.

show abstract

Full‐field Peak Pressure Prediction of Shock Waves from Underwater Explosion of Cylindrical Charges

Cited by 12 publications

References 17 publications

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Centrifuge experiment and numerical study on the dynamic response of air-backed plate to underwater explosion

Similarity Law between Centrifuge Scale Test and Prototype Underwater Explosion

Contact Info

Product

Resources

About