Modelling fragmentation of a 155 mm artillery shell IED in a buried mine blast event

Rasico, James G.; Jensen, Morten Rikard; Newman, Craig A.

doi:10.1504/ijvp.2018.10016905

Cited by 4 publications

(12 citation statements)

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“…In the base model, no contact stiffness is given thus 1 × 10 13 Pa m -1 is used. However, there can be situations where this needs to be changed by the user, e.g., in the case of an artillery shell used as an IED as seen in Rasico et al 7 This was due to the high pressure that the 11 kg TNT charge applied to the Lagrangian casing. Five different values were tried in this sensitivity study: 1 × 10 11 , 1 × 10 12 , 1 × 10 13 , 1 × 10 14 , and 1 × 10 13 Pa m -1 .…”

Section: Soil Parametersmentioning

confidence: 99%

“…The iDPM module is described in detail by Børvik et al 3 and Wadley et al 4 where the approach was verified against mine blast experiments. The module was also successfully applied by Holloman et al 5 , Kyner et al 6 , Rasico et al, 7 and Jensen and Smith. 8 In addition to subscale and component testing and validation, an extensive number of full-vehicle blast tests have been simulated with the results from the simulation compared and validated with field test data.…”

Section: Introductionmentioning

confidence: 99%

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Parameter characterization of a buried mine blast event with further emphasis on sympathetic detonation and layered soil bed conditions

Jensen¹,

Smith²,

Khanna³

2021

Journal of Defense Modeling & Simulation

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The presented work documents the results of a comprehensive sensitivity study of the structural response of a military vehicle subjected to the impulse from a buried charge using the discrete particle method (DPM) to model the soil and high explosive (HE) coupled to a finite-element solver for the structure. Eighteen different process and numerical parameters were studied. Each of the numerical results was compared with a base model to see the influence of the considered parameter. The structure in the base model was the TARDEC Generic Vehicle Hull and the response parameter was chosen to be the total blast impulse (TBI) on the structure. The non-linear transient dynamic explicit finite-element solver used for the analysis was the IMPETUS Afea Solver®. The study includes soil characteristics and charge related parameters, such as size, type, geometry, and location. The depth of burial (DOB) and number of discrete particles were also considered in the study. Further, different numerical parameters were included. The results provide a good understanding of process and numerical parameters when modeling buried charges with a coupled finite-element model (FEM) and DPM approach. As a natural extension of the sensitivity study the effect of a layered soil bed is investigated, the topsoil either being dry or wet soil. Further, it is illustrated how to model a sympathetic detonation where the detonation of one improvised explosive device (IED) generates a pressure that results in the detonation of a second IED.

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Section: Soil Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parameter characterization of a buried mine blast event with further emphasis on sympathetic detonation and layered soil bed conditions

Jensen¹,

Smith²,

Khanna³

2021

Journal of Defense Modeling & Simulation

Self Cite

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“…That, in fact, is the definition of the normal distribution law in probability theory. Therefore, it is proposed to use the normal (Gaussian) distribution as a sufficiently reasonable theoretically and convenient for modeling in contrast to the works [3,[5][6][7], which use the Weibull distribution.…”

Section: A Probabilistic Approach 21 мOdeling Of Structural Inhomogementioning

confidence: 99%

“…For a long time, the probabilistic approach to solving such problems was limited to the analytical dependences of the fragmentation spectrum parameters on the strain rate determined by the Mott model and its variants proposed by Grady, Gilvarry and other researchers [1]. A large number of researchers in the modeling of fracture processes [3,[5][6][7] rely to some extent on the approach of Mott, which, in fact, is the evolution of a simplified one-dimensional model problem, which makes it insufficiently justified and difficult to apply in practical terms to determine fragmentation spectrum or fragments velocities of real structures destroyed by an explosion. Currently, the development of computer technology makes the most promising approach that allows for numerical simulation of destruction to take into account the heterogeneity of the body's internal structure by distributing the physical and mechanical characteristics responsible for strength [2-4, 6, 7].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the development of computer technology makes the most promising approach that allows for numerical simulation of destruction to take into account the heterogeneity of the body's internal structure by distributing the physical and mechanical characteristics responsible for strength [2-4, 6, 7]. Moreover, the regular ability to specify the distribution of structural inhomogeneities is already included in some popular software designed to calculate the destruction [7].…”

Section: Introductionmentioning

confidence: 99%

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A probabilistic approach to modeling collisions with thin barriers

Пашков

2019

EPJ Web Conf.

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In many fracture problems, fragmentation is essentially a probabilistic process, which is determined by the stochastic nature of the distribution of inhomogeneities of the internal structure of material. The probabilistic approach is described, which allows us to model structural heterogeneities of the material in a simple form, practically without any complication of the model and additional experiments. Using experimental data and numerical simulation results, it is shown that the introduction of only one additional parameter (dispersion of the strength properties distribution) into the material model makes it possible to give a probabilistic character to the crack formation process at any scale level, which corresponds to theoretical concepts and experimental data. Distribution of materials strength characteristics (according to the selected distribution law) in the cells of the computational domain is used for initial heterogeneities and materials structure defects modeling. It is shown that the number and size of the “petals” at the penetration of thin barriers depend of the speed of the projectile and the strength characteristics of the barrier.

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Impact Safety Improvement of High Explosives Through the Use of Internal Cavity Design

Xiao

Thornhill

Arora

et al. 2022

Propellants Explo Pyrotec

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This study offers improved safety design guidelines for high explosives (HE), creating impact insensitive geometries, capitalising on the potential for additive layer manufacturing techniques. There are numerous safety concerns when considering energetic materials and HEs, the primary concern, subject of this work, is the risk of unplanned detonation from impact. There are multiple potential causes for unplanned detonation due to impact; one of which is the impact from a high‐speed foreign object. Despite this substantial risk, the problem has not been publicly addressed by means of adjusting the design of the charge itself. Therefore, investigations into the internal design of the charge were executed, whereby the inclusion of various sized and shaped voids are assessed, to establish their effect upon the reactivity of the HE. Using computational modelling, allows for numerous designs to be assessed and developed, and the impact sensitivity of the charge to be tested across a range of scenarios. The proposed validated computational model enables designs to be optimised in a safe and efficient manner, reducing the number of physical tests required, and thus minimising time, cost and the environmental impact.

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Modelling fragmentation of a 155 mm artillery shell IED in a buried mine blast event

Cited by 4 publications

References 0 publications

Parameter characterization of a buried mine blast event with further emphasis on sympathetic detonation and layered soil bed conditions

Parameter characterization of a buried mine blast event with further emphasis on sympathetic detonation and layered soil bed conditions

A probabilistic approach to modeling collisions with thin barriers

Impact Safety Improvement of High Explosives Through the Use of Internal Cavity Design

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