Study on JWL equation of state for the numerical simulation of near-field and far-field effects in underwater explosion scenario

Koli, Sourabh; Chellapandi, P.; Rao, Lokavarapu Bhaskara; Sawant, Akshay

doi:10.1016/j.jestch.2020.01.007

Cited by 21 publications

(9 citation statements)

References 10 publications

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“…The predicted bubble period is also sensitive to the value of the w parameter used in the JWL equation of state [41]. The values of w quoted in Table 3 (0.20 for Comp 1, 0.30 for Comp 2) provide a good match to measured bubble periods when used with the calibrated water density.…”

Section: Bubble Resultsmentioning

confidence: 84%

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Milne

Burn

Carr

et al. 2021

Propellants Explo Pyrotec

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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.

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Section: Bubble Resultsmentioning

confidence: 84%

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Milne

Burn

Carr

et al. 2021

Propellants Explo Pyrotec

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“…The former case requires employing fully coupled Eulerian-Lagrangian analysis to satisfactorily reproduce the experimental observations, while the latter can be safely simulated employing the pure Lagrangian approach [20]. In the case study presented in this work, considering the explosive charge as a sphere of TNT with density 1610 kg⋅m -3 [39], the radial expansion of the shock front at the plate location value is r̅ plate =13.7, that identifies a far-field scenario. Hence, the pure Lagrangian approach is suitable to simulate the explosive event and no improvement is expected by performing the CEL analysis.…”

Section: Discussionmentioning

confidence: 99%

Numerical study on the influence of boundary conditions on the blast response of composite plates

Lomazzi

Vescovini

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Blast loading represents a critical dynamic condition for both metal and composite structures. The blast response of metal materials has been extensively dealt with by researchers through experimental, analytical and numerical analyses, while composite materials appear to have been investigated in less detail. In this work, the blast response of a composite plate is numerically investigated employing the pure Lagrangian and the fully coupled Eulerian-Lagrangian (CEL) approaches using the LS-DYNA® software package. The latter methodology is set up to describe the effects determined by close-range explosions, such as the strongly non-uniform pressure distribution on the plate exposed area. Moreover, this work focuses on the characterisation of the influence of the boundary conditions on the plate response. The numerical methodology established in this work is set up and validated according to similar studies present in the literature.

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“…The pre-processing software Patran provides the explosive material model based on JWL equation when Dytran is used as the solver. The JWL equation belongs to the dynamic state equation and can accurately express the expanding process of doing work [9] . The JWL equation is as follows:…”

Section: Load Simulationmentioning

confidence: 99%

Fatigue life prediction of aircraft gun cabin structure under impact

Ding

Wang

2023

J. Phys.: Conf. Ser.

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The aircraft gun firing will cause serious impact on airframe structure. According to the gun firing principle, the muzzle blast wave is simulated by chemical explosion. ALE method is used to deal with the fluid-structure interaction between high-pressure flowing air and the surface of the cabin. Then the expression model of the impact load is established. The numerical calculation is completed to analyse the dynamic response of the cabin structure under the impact load. The parameters of load and cabin model are modified by using the experiment results. Comparing the calculated dynamic response with the experiment results, the error is within acceptable range. Multiaxial stress equivalence and rain-flow counting method are used to process the simulation impact response data to estimate the impact fatigue life. In conclusion, the paper provides a feasible method for analysing dynamic response and fatigue life of gun cabin structure.

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Study on JWL equation of state for the numerical simulation of near-field and far-field effects in underwater explosion scenario

Cited by 21 publications

References 10 publications

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

A Modelling Approach for the Analysis of Underwater Explosive Performance Trials

Numerical study on the influence of boundary conditions on the blast response of composite plates

Fatigue life prediction of aircraft gun cabin structure under impact

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