Numerical modeling of the large strain problem in the case of mushrooming projectiles

Kędzierski, Piotr; Morka, Andrzej; Stanisławek, Sebastian; Surma, Zbigniew

doi:10.1016/j.ijimpeng.2019.103403

Cited by 20 publications

(7 citation statements)

References 37 publications

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“…Since the simulated crash scenario is a dynamic phenomenon in which the strain rate effect plays a significant role, the widely used Johnson–Cook (JC) constitutive model [ 39 , 40 , 41 , 42 , 43 ] was implemented to model the behavior of the lighting pole. Specifically, the simplified version of the JC model (SJC) was adopted.…”

Section: Problem Descriptionmentioning

confidence: 99%

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Baranowski

Damaziak

2021

Materials

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In this paper, numerical simulations of the EN 12767 test procedure for a vehicle–lighting pole crash are presented. A representative soil–vehicle–lighting pole model is first developed. The Geo Metro vehicle model is used, and significant attention is given to representing the soil and its interaction with the traffic pole. Soil is represented using smoothed particle hydrodynamics (SPH) coupled with finite elements (FEs). A parametric study is carried out to investigate the key factors influencing the outcomes and consequently the estimation of the occupant safety levels during crash scenario described in EN 12767. First, a sensitivity study of lighting pole mesh is conducted As a result, the optimal mesh size is used for further studies regarding physical parameters such as soil properties and friction coefficient in vehicle–pole interfaces. Friction and mesh size are found to have a considerable influence on the acceleration severity index (ASI), theoretical head impact velocity (THIV), post-impact velocity and vehicle behavior during the lighting pole crash scenario.

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Section: Problem Descriptionmentioning

confidence: 99%

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Baranowski

Damaziak

2021

Materials

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“…During the impact, the bullet is subjected to high velocities, inducing high strain rates in the material, and also large deformation as we can see on the tests carried out in [27]. Therefore, for the lead core a perfect plastic behavior is assumed and defined by Equation (22).…”

Section: Perfect Plastic Modified Model For Ballistic Applicationmentioning

confidence: 99%

Characterization of the Mechanical Behavior of a Lead Alloy, from Quasi-Static to Dynamic Loading for a Wide Range of Temperatures

2020

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The current needs in terms of ballistic protection for armed forces require an almost constant improvement in performance to face the constantly evolving threats and scenarios. Ballistic tests are conventionally carried out in order to assess and validate the levels of protection. The challenge is to be able to set up a digital protocol and only carry out final validation tests. Indeed, the advantage of digital simulation lies in the possibility of being able to evaluate a wide variety of configurations. In order to obtain reliable results, it is necessary to use sufficiently precise material behavior models to transcribe the phenomena observed during the impact. Our study focuses on the behavior of a small caliber ammunition with a ductile core impacting personal protection. More particularly on the mechanical behavior of the lead alloy core. Thus, compression tests have been carried out on a wide range of deformation rates, from quasi-static behavior to dynamic regime, at different temperatures. The study in dynamic conditions was carried out using split Hopkinson pressure bars. Due to the material properties, the experimental device had to be adapted in order to optimize the propagation of the waves allowing to measure signals (elastic waves). These tests demonstrate the dependency of the stress with strain rate and temperature. Dynamic restoration and recrystallization phenomena, characteristic of a material deformed in its hot working area, have also been identified. The associated oscillations due to Pochhammer–Chree effect, observable on the stress–strain curves, constitute the major problem for the implementation of behavioral models. Finally, a constitutive model sensitive to strain rate and temperature is investigated for ballistic purposes.

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“…Debido a la complejidad logística que supone la realización de un ensayo de impacto empleando munición real, se han empleado los resultados obtenidos por Kedzierski et al [125], donde dispara el proyectil a dos velocidades diferentes, (105 m/s y 363 m/s) contra una superficie rígida, analizando la deformación que experimenta el proyectil en cada instante de tiempo. 11.4 mm 11.5 mm t =0.45 ms Figura 6.4: Comparación de los resultados obtenidos con el modelo numérico con los resultados obtenidos por Kedzierski et al [125] Como se observa en la figura 6.4, el modelo numérico desarrollado muestra una buena corelacción con los resultdos experimentales obtenidos por Kedzierski et al [125], considerando el proyectil calibrado para futuras aplicaciones en impactos.…”

Section: Recubrimiento Latónunclassified

Ballistic performance of aramid composite combat helmet for protection against small projectiles

Rubio

Rodríguez-Millán

Marco

et al. 2019

Composite Structures

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Numerical modeling of the large strain problem in the case of mushrooming projectiles

Cited by 20 publications

References 37 publications

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Characterization of the Mechanical Behavior of a Lead Alloy, from Quasi-Static to Dynamic Loading for a Wide Range of Temperatures

Ballistic performance of aramid composite combat helmet for protection against small projectiles

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