Minimum mesh design criteria for blast wave development and structural response - MMALE method

Trajkovski, Jovan; Kunc, Robert; Perenda, Jasenko; Prebil, Ivan

doi:10.1590/s1679-78252014001100006

Cited by 42 publications

(29 citation statements)

References 34 publications

(35 reference statements)

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“…However, in Figure 3 it is possible to support that the impulses could be estimated with confidence, knowing that ProsAir overestimates the impulse and LS-DYNA underestimates it. These results are in accordance with others in terms of LS-DYNA and Air3D (similar to ProsAir) behavior (Huang et al, 2012;Rigby et al, 2014;Trajkovski et al, 2014). Figure 1).…”

Section: Source: Authorssupporting

confidence: 92%

Application of grid convergence index to shock wave validated with LS-DYNA and ProsAir

et al. 2020

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The discretization error is not always calculated, even though it is essential for the studies of computational solid mechanics. However, it is well known that an error committed by the mesh used can be as large as the measured variable, which greatly invalidates the results obtained. The grid convergence index (GCI) method makes possible to determine on a solid basis, the order of convergence and the asymptotic solution. This method seems to be a suitable estimator despite further research is needed in the context of blast situations and finite element (FE) calculations. For this purpose, field trials were performed consisting in the detonation of a spherical hanging load of homemade explosive. The pressure generated by the shock wave was measured in different positions at two distances. With these data, a TNT equivalent has been obtained and used to calculate the shock propagation with the solvers LS-DYNA and ProsAir. This work aims to verify the GCI method by comparing its results with field data along with the simulations carried out. The comparison also seeks to validate the methodology used to obtain the TNT equivalent.This research shows that the GCI gives good results for both solvers despite the complexity of the physical problem. Besides, LS-DYNA displays better correlation with the experimental data than the ProsAir results, with an error of less than 10% in all values. RESUMENLa estimación del error de discretización no siempre se calcula, aunque es algo fundamental para el estudio de la mecánica computacional de los sólidos. Sin embargo, es bien sabido que el error cometido por la malla utilizada puede ser del mismo orden que la variable medida, lo que llega a invalidar los resultados obtenidos. El método del ındice de convergencia de la malla (GCI) permite determinar sobre una base sólida el orden de convergencia y la solución asintótica, por lo que parece ser un buen estimador, a pesar de que es necesario seguir investigando en el contexto de las situaciones de ondas de choque (explosivos) y de los cálculos de elementos finitos (FE). Para este fin, se realizaron pruebas de campo consistentes en la detonación de una carga esférica colgada de explosivo casero. La presión generada por la onda de choque se midió en diferentes posiciones a dos distancias. Con estos datos, se obtuvo un equivalente de TNT que se utilizó para calcular la propagación del choque con los programas LS-DYNA y ProsAir. Este trabajo pretende verificar el método GCI comparando sus resultados con los datos de campo junto con las simulaciones realizadas. También, la comparación busca validar la metodologıa empleada para la obtención del equivalente TNT.La investigación muestra que el GCI da buenos resultados para ambos programas a pesar de la complejidad del problema fısico. Además, el LS-DYNA produce una mejor correlación con los datos experimentales que los aportados por el ProsAir, con todos los valores por debajo del 10 % de error.Palabras clave: ındice de convergencia de malla (GCI), equivalente de TNT, LS-DYNA, ProsAir.How to ...

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Section: Source: Authorssupporting

confidence: 92%

Application of grid convergence index to shock wave validated with LS-DYNA and ProsAir

et al. 2020

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“…A straight path from the charge was assumed to estimate a travel direction for each fragment, introducing therefore some horizontal components in the velocities which varied between 1650 m/s and 1780 m/s. Whilst the blast loads could have been simulated using Eulerian approaches (Trajkovski, Kunc et al, 2014), in this case it was decided to use the CONWEP module built into LS-DYNA. This allowed for the pressure intensity and exact arrival time to be varied on the slab surface in a realistic manner.…”

Section: Finite Element Simulationmentioning

confidence: 99%

Modeling of Combined Impact and Blast Loading on Reinforced Concrete Slabs

Linz

Fan

Lee

2016

Lat. Am. j. solids struct.

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“…Tavakolia and Kiakojouri (2014) carried out numerical simulations of nonlinear dynamic response of square stiffened steel plates subjected to uniform blast loading by FE code ABAQUS and investigated the effect of stiffener configurations, boundary conditions, fixing details and strain rate on the dynamic response. Trajkovski et al (2014) conducted detailed numerical simulations of circular plates made of RHA steel under blast loading using multi material arbitrary Lagrange Euler method in the FE code LS-DYNA to investigate the influence of mesh properties (particularly mesh size, its biasing and distance of the boundary conditions from the deforming structure) on blast wave loading parameters and structural response and proposed a minimum mesh design criteria based on the results.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Strain Rate Sensitivity and Strain Hardening on the Saturated Impulse of Plates

Zhu

Chen

et al. 2017

Lat. Am. j. solids struct.

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This paper studies the stiffening effects of the material strain rate sensitivity and strain hardening on the saturated impulse of elastic, perfectly plastic plates. Finite element (FE) code ABAQUS is employed to simulate the elastoplastic response of square plates under rectangular pressure pulse. Rigid-plastic analyses for saturated impulse, which consider strain rate sensitivity and strain hardening, are conducted. Satisfactory agreement between the finite element models (FEM) and predictions of the rigid-plastic analysis is obtained, which verifies that the proposed rigid-plastic methods are effective to solve the problem including strain rate sensitivity and strain hardening. The quantitative results for the scale effect of the strain rate sensitivity are given. The results for the stiffening effects suggest that two general stiffening factors 1 n and 2 n , which characterizes the strain rate sensitivity and strain hardening effect, respectively can be defined. The saturated displacement is inversely proportional to the stiffening factors (i.e. 1 n and 2 n ) and saturated impulse is inversely proportional to the square roots of the stiffening factors (i.e. 1 n and 2 n ). Formulae for displacement and saturated impulse are proposed based on the empirical analysis.

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Minimum mesh design criteria for blast wave development and structural response - MMALE method

Cited by 42 publications

References 34 publications

Application of grid convergence index to shock wave validated with LS-DYNA and ProsAir

Application of grid convergence index to shock wave validated with LS-DYNA and ProsAir

Modeling of Combined Impact and Blast Loading on Reinforced Concrete Slabs

Effects of the Strain Rate Sensitivity and Strain Hardening on the Saturated Impulse of Plates

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