Parametric study of the dynamic JWL-EOS for detonation products

e centrifugal underwater explosion tests and corresponding numerical simulations were carried out to study the laws of shock wave and bubble pulsation. A semiempirical method to determine JWL state equation parameters was given. e influence on numerical results caused by factors such as state equation of water, boundary condition, and mesh size was analyzed by comparing with the centrifugal underwater explosion test results. e results show that the similarity criterion is also suitable in numerical simulation; the shock wave peak pressure calculated by polynomial state equation is smaller than that of shock state equation. However, the maximum bubble radius and the pulsation period calculated by the two equations are almost the same. e maximum bubble radius is mainly affected by the boundary simulating the test model box, and the pulsation period is mainly affected by the artificial cutoff boundary. With the increase of standoff distance of measuring point, the mesh size required for the numerical calculation decreases; the size of the two-dimensional model is recommended to take 1/30 ∼ 1/10 explosion radius. In three-dimensional models, when mesh size is 2 times larger than explosion radius, the bubble motion change in the second pulsation period is not obvious. When mesh size is smaller than 1 time explosive radius, the full period of bubble pulsation can be well simulated, but calculation errors increase slowly and computation time greatly increases, so the three-dimensional mesh size is suggested to take the charge radius. Shock wave peak pressure is basically unaffected by gravity. As the gravity increases, the bubble maximum radius and the first pulsation period both decrease.

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“…Using D and ρ 0 , the polytropic index of the detonation products c [28] and E 0 [29] can be expressed as…”

Section: E State Equation Ofmentioning

confidence: 99%

Calibration of Numerical Simulation Methods for Underwater Explosion with Centrifugal Tests

Wang

Shicong

Haoran

2019

Shock and Vibration

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“…For a high explosive model, the Jones-Wilkins-Lee (JWL) [23] method was used to describe the detonation of TNT. This equation defines the pressure field as a function of relative volume and internal energy per initial volume as…”

Section: Finite Element Modelmentioning

confidence: 99%

Mechanics of Plate Fracture from Detonation Wave Interaction

Zhang

Liang

et al. 2018

Propellants Explo Pyrotec

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The interaction of detonation waves was widely used in warhead design due to its ability to generate local high‐pressure regions. In this paper, the detonation interaction was investigated by experiments and finite element (FE) models. Experiments were conducted first to capture the fundamental dynamic fracture and fragmentation patterns and they served as a basis of validation for both the FE and analytical models. According to fracture surface, shear fracture is prior mechanism for steel‐plate fragmentation. The FE results indicated the dynamic fracture of steel plate was referred to the pressure difference between the collision area and its adjacent areas. A theoretical analysis of detonation wave interaction in explosive was carried out, and the relationship between the pressure at the collision area and adjacent areas was obtained. In the discussion part, the influencing factors and the optimal results for the plate fracture in the simulation calculation were carried out.

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“…Where: A, B, C, R 1 , R 2 , ω are the fixed material and P and V are non‐dimensional pressure and volume respectively .…”

Section: The Basic Equationsmentioning

confidence: 99%

Experimental and numerical study of isotropic circular plates' response to underwater explosive loading, created by conic shock tube

Heshmati

Mozafari

2017

Materialwissenschaft Werkst

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Today, to reduce the cost and increase the safety, test devices like conic shock tube have been widely used to investigate the underwater explosion phenomenon and its impact on structures. A shock tube is designed, manufactured and utilized in the mechanic of explosion laboratory of mechanic faculty of K.N. Toosi University of Technology to study the effect of isotropic metal plates' material in the present study. The source which creates shock in the utilized shock tube is an explosive material and the positive point is that in such a tube a high pressure is produced with a tiny explosive charge. In order to investigate the effect of the material and the geometry of the utilized metal plate, three materials are considered with two different thicknesses in the experimental tests. The behavior of the plate can be measured if the amount of the pressure produced by the explosive charge and the amount of plate's transformation is specified. To present a semi‐experimental equation of the behavior of the plate which is under the explosion loading with the water interface in the experimental tests, numerical simulation is performed with LS‐Dyna software. At the end, by combining the experimental and simulation results, the effect of the material and the thickness changes is studied specifically and an explosive charge is provided by adding weight parameter to anticipate the transformation of these metal plates.

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Parametric study of the dynamic JWL-EOS for detonation products

Cited by 32 publications

References 4 publications

Calibration of Numerical Simulation Methods for Underwater Explosion with Centrifugal Tests

Calibration of Numerical Simulation Methods for Underwater Explosion with Centrifugal Tests

Mechanics of Plate Fracture from Detonation Wave Interaction

Experimental and numerical study of isotropic circular plates' response to underwater explosive loading, created by conic shock tube

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