Relevant bibliographies by topics / LS-DYNA impact simulation

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'LS-DYNA impact simulation'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "LS-DYNA impact simulation"

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Likhonina, Raissa. "FINITE ELEMENT MODELLING AND SIMULATION OF VEHICLE IMPACT ON STEEL SAFETY BARRIERS." Acta Polytechnica 56, no. 6 (December 31, 2016): 455–61. http://dx.doi.org/10.14311/ap.2016.56.0455.

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This paper deals with a FEA simulation of the vehicle crash with steel safety barriers in ANSYS LS-DYNA® 15.0. Two types of safety barriers are used: JSNH4/H2 and JSAM-2/H2. A geometrical model of the barrier in the Modeler ANSYS® Workbench™ 15.0 was created and after that it was transformed into LS-DYNA® 15.0 to complete the crash test simulation. After computation in solver ANSYS LS-DYNA® 15.0 the results of the simulation such as impact forces, a body displacement and an integral energy were analyzed.
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Gentry, T. Russell, and Lawrence C. Bank. "Finite-Element Modeling and Model Verification of Steel W-Beam Guardrails Subject to Pendulum Impact Loading." Transportation Research Record: Journal of the Transportation Research Board 1647, no. 1 (January 1998): 147–57. http://dx.doi.org/10.3141/1647-18.

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The experimental and simulated response of steel W-beam guards to pendulum impact loading for impact velocities of 20 km/h, 30 km/h, and 35 km/h are presented. The guardrails were supported by four posts and cable-anchored at each end to ensure that the full tension capacity of the rail could be developed. Experiments carried out with a 912-kg impact pendulum are compared with LS-DYNA finite-element simulations of the impact events. Pendulum tests were completed at the Turner Fairbank Highway Research Center of the Federal Highway Administration. Acceleration, velocity, and displacement time histories are compared for the pendulum impact test and the LS-DYNA simulations. Comparison of the experimental and simulation acceleration records is made using the Numerical Analysis of Roadside Design time-domain statistics. The comparative statistics show that the simulations are in good agreement with the experiments. Guardrail tension data and cable tension data are presented from the LS-DYNA simulations. Results show that the guardrail was close to its tension yield point when impacted an initial velocity of 35 km/h.
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Zhao, Gui Fan, Zi Peng Zhang, and Tso Liang Teng. "Finite Elements Analysis on the Impact Absorption Behavior of Composite Vehicle Longeron." Advanced Materials Research 183-185 (January 2011): 1913–17. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1913.

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In this paper, an experimental model was built in the nonlinear finite element software LS-DYNA. A metal tube wrapped fiberglass epoxy composite outside (called “composite tube” for short) was impacted in its axial direction in the simulation. The key problems about building the model were discussed later. Comparing the simulation and experiment results, we proved the validity of the model. Furthermore, we applied the material type of the composite tube to vehicle longeron, and carried on the simulation of automobile frontal collisions in LS-DYNA. The simulation results showed using the new type composite material could reduce the longeron weight to original 33.76% without lowering the safety.
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Yoo, Tae Kwang, and Tong Qiu. "Optimization of constitutive model parameters for simulation of polystyrene concrete subjected to impact." International Journal of Protective Structures 9, no. 2 (June 20, 2017): 121–40. http://dx.doi.org/10.1177/2041419617716496.

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This article presents the results of a series of experimental testing and numerical modeling studies to optimize the parameters of a constitutive material model to accurately simulate the behavior of polystyrene crushable concrete during impact loading using LS-DYNA. Quasi-static compression tests and confined drop impact tests were conducted. To model the quasi-static compression tests, the response surface methodology was used to optimize Poisson’s ratio and friction angle in the pseudo-tensor model in LS-DYNA. Using the optimized model parameters, the simulated compression stress versus strain relationship showed an excellent agreement with those from the compression tests. To model the confined drop impact tests, the strain rate sensitivity parameter in LS-DYNA was optimized by comparing the drop impact simulations at different strain rate sensitivity values with the drop impact tests. This study suggests that the pseudo-tensor material model is potentially suitable for modeling crushable concrete. Although the optimized constitutive model parameters are specific for the polystyrene concrete mix used in this study, similar approach can be used to optimize model parameters for other polystyrene concrete mixes.
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Zhu, Xiu Yun, Rong Pan, and Feng Sun. "FEM Analysis of Impact Tests for Steel Plate Concrete Panels against Scaled-Aircraft Impact." Applied Mechanics and Materials 477-478 (December 2013): 777–83. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.777.

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Due to the rear-face steel plate of the steel plate concrete wall (SC) is very effective in preventing the perforation and scabbing of concrete, in order to resist the impact of commercial aircraft crash, steel plate concrete structures are usually used in the design of external walls of nuclear power plants. In this paper, the simulation analysis of the impact test of 1/7.5 scaled aircraft model impacting the steel plated concrete panels is carried out by using finite element code ANSYS/LS-DYNA. The Winfrith material model (*MAT_84) in ANSYS/LS-DYNA is used to simulate the concrete. The damage profile of panels and residual velocity of aircraft engine comparisons between the simulations and tests are presented in this paper. The results indicate that the damage modes from the impact simulations are very good agreement with the experimental result. It is verified that not only the selection of the material parameters needed for the steel plated concrete wall and aircraft model but also the entire analysis method was appropriate and effective. This paper provided the effective methodology for simulation of the response of the steel plated concrete structure of nuclear power plant due to commercial aircraft crash impact.
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Chen, Yu Feng, and Guang Xiang Yi. "Dynamic Response Analysis of the Reinforced Concrete Column under the Effect of Explosive Impact Load." Advanced Materials Research 681 (April 2013): 99–104. http://dx.doi.org/10.4028/www.scientific.net/amr.681.99.

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This paper does the data simulation analysis by using the large-scale finite element nonlinear ANSYS/LS-DYNA software. It chooses the MAT111(MAT-JOHNSON-HOLMQUIST -CONCRETE）concrete materials and the MAT3 (MAT-PLASTIC-KINEMATIC) reinforcement material model in ANSYS/LS-DYNA finite element software, builds the separating RC column finite element model, dynamically simulates the hurting process of RC column under the effect of explosive impact load, and mainly does research into the damage degree of RC column under different effects of explosive load of different peak pressures.
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McKown, S., and Robert A. W. Mines. "Measurement of Material Properties for Metal Foam Cored Polymer Composite Sandwich Construction." Applied Mechanics and Materials 1-2 (September 2004): 211–16. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.211.

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Material properties are required for the numerical simulation of the impact progressive collapse of metal foam cored polymer composite sandwich beams, using LS-DYNA. As far as the metal foam, Alporas, is concerned, multi-axial tension and compression data is required. This includes large scale crush and tensile rupture. An Arcan test fixture was developed, in which a sample of foam can be subject to tensile and shear deformation simultaneously. The data was also used to calibrate the crushable foam material model in LS-DYNA. For the skin, tensile and compression data was generated for a cross ply glass fibre thermoplastic laminate. The data was then used to calibrate the composite damage material model in LS-DYNA. Inclusion of calibrated material models into the simulation of the progressive collapse of metal foam cored composite sandwich beams will be briefly discussed.
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Marcicki, James, Min Zhu, Alexander Bartlett, Xiao Guang Yang, Yijung Chen, Theodore Miller, Pierre L'Eplattenier, and Iñaki Caldichoury. "A Simulation Framework for Battery Cell Impact Safety Modeling Using LS-DYNA." Journal of The Electrochemical Society 164, no. 1 (2017): A6440—A6448. http://dx.doi.org/10.1149/2.0661701jes.

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Wang, X. G., Wei Guo, and Jian Qin Liu. "Explicit Dynamics Simulation Research on Soil Cutting of Shield Machine Based on LS-DYNA." Materials Science Forum 697-698 (September 2011): 642–45. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.642.

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In this paper, the universal nonlinear finite element software LS-DYNA is applied to the explicit dynamics simulation of shield’s soil cutting in tunneling, and using Non-reflective boundary of DYNA’s module, accurately conduct the dynamic analysis of shield’s tunneling. Finally Making visualization processing on the computed results with the post-processing soft LS-PREPOST. Compared with results of static’s simulation and small-sized shield experiment indoor, the explicit dynamics simulation used in the paper is in good agreement with them. Through the alleosis chat of internal energy, we can see that LS-DYNA can be commendably utilized to explicit dynamics simulation of soil cutting of shield’s cutter, simultaneously, we also concluded that moderately increasing the cutter opening rate will have a significant impact on improving the unearthed rate of soil residue, tunneling efficiency and lowering the total thrust force of the shield.
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Lin, Min, Bao Jun Pang, and Jin Cheng. "Experimental and Numerical Study on the Mesh Bumper by Hypervelocity Impact." Advanced Materials Research 457-458 (January 2012): 108–12. http://dx.doi.org/10.4028/www.scientific.net/amr.457-458.108.

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In order to systematically explore the properties of the mesh bumper under hypervelocity impact, the quantitative research of protect characteristics was carried out with the numerical simulation. The experiments, in which the projectile impacted the multi-layers mesh bumper at hypervelocity, were simulated using the Ls-Dyna hydro-codes. The results for simulations and experiments were compared and analyzed. The effectiveness and accuracy of the simulation model is proved. It is shown that the morphologies of debris cloud were obviously varied with the change of impact position.
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Dissertations / Theses on the topic "LS-DYNA impact simulation"

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Blin-Bellomi, Lucie M. "Simulation of Dynamic Impact of Self-Centering Concentrically-Braced Frames using LS-DYNA 971." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342448514.

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Khambati, Suraush Q. "Constitutive Modeling of Rubber and Glass for the Impact Simulation of Safety Glass using the commercial code LS-DYNA." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1302884674.

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Norman, Oskar. "Anisotropic material modeling and impact simulation of a brush cutter casing made of a short fiber reinforced plastic." Thesis, Linköpings universitet, Hållfasthetslära, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-107671.

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A popular way to reduce weight in industrial products without compromising the strength or stiffness is to replace components made of metal by plastics that have been reinforced by glass fibers. When fibers are introduced in a plastic, the resulting composite usually becomes anisotropic, which makes it much more complex to work with in simulation software. This thesis looks at modeling of such a composite using the multi-scale material modeling tool Digimat. An injection molding simulation of a brush cutter casing made of a short fiber reinforced plastic has been performed in order to obtain information about the glass fiber orientations, and thus the anisotropy, in each material point. That information has then been transferred over from the injection mesh to the structural mesh via a mapping routine. An elasto-viscoplastic material model with failure has been employed and calibrated against experimental data to find the corresponding material parameters. Lastly, a finite element analysis simulating a drop test has been performed. The results from the analysis have been compared with a physical drop test in order to evaluate the accuracy of the methodology used. The outcome has been discussed, conclusions have been drawn and suggestions for further studies have been presented.
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Wang, Wei. "Simulation of hard projectile impact on friction stir welded plate." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/7213.

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A numerical simulation is conducted using LS-DYNA to simulate hard projectile impact on a friction stir welded (FSW) plate. As the hard projectile has a wide range of velocity, mass and shape, when referring to AMC 25.963(e) of CS-25, ―Fuel Tank Access Cover‖, the hard projectile can be defined as 9.5 mm cubic-shaped steel engine debris with an initial impact velocity of 213.4 m/s (700 ft/s). This preliminary study was to evaluate whether the fuel tank adjacent skin panel joined by FSW would pass the regulation. First, the geometry and Johnson-Cook material model of the FSW joint were developed based on previous experimental research and validated by comparison with the tensile test on the FSW specimen. Then the impact on an Aluminium Alloy 2024 (AA 2024) plate without FSW was modelled. The minimum thickness of a homogeneous AA 2024 plate which could withstand the impact from engine debris is 3 mm. Finally the impact on 3 mm thick AA 2024 FSW plate was simulated. The welding induced residual stress was implemented in the plate model. The impact centre was changed from the nugget zone to the thermo-mechanically affected zone, heat-affected zone and base material zone of the FSW joint. Penetration only occurred in the model with impact centre on the nugget zone. Additional simulation indicated that increasing the thickness of the FSW plate to 3.6 mm could prevent the penetration.
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Kotian, Kunal. "Detection of in-plane stress waves with Polyvinylidene Fluoride (PVDF) sensors." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1357254821.

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Ayagara, Aravind Rajan. "Caractérisation de la fracturation dynamique des os de la cage thoracique : simulations numériques et validation expérimentale." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3041.

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L’objectif de cette thèse est de caractériser le comportement mécanique des côtes isolées sous impact en dynamique rapide par l’expérimentation et les calculs EF. Dans le cadre de cette étude, les côtes de porc ont été choisies comme substituts de la côte humaine. Les essais de flexion trois points en dynamique rapide ont été réalisés avec les barres de Hopkinson. Les résultats de campagne expérimentale ont mis en évidence l’influence de la vitesse de déformation sur le temps de fracture, le faciès de rupture et également, sur l’amplitude des forces d’impact. Un modèle numérique 3D d’une côte de porc a été développé, grâce aux images obtenues par micro-CT en Haute Résolution (HR-pQCT). Ensuite, les propriétés élastiques des constituants ont été attribuées à partir des niveaux de gris des images de HR-pQCT. Une loi de comportement élastique-viscoplastique, modifiée pour prendre en compte les effets de la vitesse de déformation couplée avec une loi d’endommagement a été élaborée. La loi d’endommagement présentée, nous permet de prendre en compte l’endommagement non-linaire, la réduction de la rigidité de la structure et les effets de la vitesse de déformation. Le modèle EF présenté dans cette thèse est capable de prédire la fracture des côtes sous impact en dynamique rapide
The objective of this study is to characterize the mechanical behavior of isolated porcine ribs subjected to dynamic impact through experiments and numerical simulations. The porcine rib was used as a human surrogate rib in order to develop an adapted methodology for the human rib. A three Split Hopkinson Pressure Bar (SHPB) setup for three-point bending tests was used. An ensemble of 20 test data was considered to be comprehensible for experimental characterization, thereby, showing an influence of strain rate on both time for fracture and amplitudes of force response. A three-dimensional porcine rib model was generated from the DICOM images of High-Resolution peripheral Quantitative Computed Tomography (HR-pQCT) scans. Material properties interpolated using power-law regression equations based on apparent density were assigned to the numerical rib. A modified elastic-viscoplastic constitutive law, capable of considering the effects of strain rate was elaborated. An incremental and stress-state dependent damage law, capable of considering effects of strain rate on fracture propagation, non-linear damage accumulation and instabilities was coupled to the constitutive law. The proposed Finite Element model is able to predict satisfactory force-displacement curve and fracture patterns of the tested ribs indicating that the developed numerical model may be used to investigate the fracture behavior of human ribs under dynamic loads
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Felgueiras, Rolando Alves. "Simulação numérica do comportamento ao impacto de componentes em alumínio." Master's thesis, 2012. http://hdl.handle.net/1822/22678.

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Dissertação de mestrado integrado em Engenharia Mecânica
Este trabalho pretende servir como estudo de indentação dinâmica de placas de alumínio. Existem dois tipos de denting o dinâmico e estático sendo este trabalho só sobre o dinâmico. Podemos definir o fenómeno de impacto como sendo uma solicitação ou carregamento repentino, o que neste caso vai corresponder a por exemplo uma pedra a bater no capot do carro. A resistência ao denting é uma propriedade muito importante dos painéis é um parâmetro chave no desenho para painéis como exemplo o capô de um veículo. O impacto é um fenómeno tipicamente dinâmico. Ele ocorre quando um objecto atinge outro, ou seja, colide com outro, desenvolvendo grandes forças entre eles num período muito curto de tempo, é de grande importância estudar a absorção de energia por parte dos materiais ao impacto. O principal objectivo do estudo é a realização de uma comparação entre ensaios experimentais dinâmicos e simulações numéricas de chapas de alumínio. O programa de ensaios numéricos utiliza um código explícito (LS-DYNA), servindo estes ensaios para comparar resultados numéricos com os dinâmicos a nível de deslocamentos, acelerações e dent ratio. O programa informático LS-DYNA é relativamente fácil de manusear tendo em conta o evoluir da utilização, apresenta resultados interessantes com o aumento do número de elementos sendo este um factor importante neste tipo de simulação numérica. O programa informático LS-DYNA revela ser um bom investimento a nível de estudos numéricos.
This work is intended as a study of dynamic denting of aluminum plates, there are two types of denting the dynamic and static and this work is focused on the dynamic. We can define the phenomenon of impact as a solicitation or sudden loading, which in this case will correspond to such as a stone hitting the hood of a car. Resistance to denting is a very important property of the panels and a key parameter in the conception of a part, as an example panels for the hood of a vehicle. The impact is typically a dynamic phenomenon. It occurs when an object strikes other, or collides with another developing large forces between them in a very short period of time. Is very important to study the energy absorption by the material to impact. The main objective of this study is the comparison between experimental and numerical simulations of dynamic aluminum plates. The numerical program uses an explicit code (LS-DYNA), serving these tests to compare numerical results with the level of dynamic displacements, accelerations and dent ratio. The computer program LS-DYNA is relatively easy to handle, having regard to the progress of use, has interesting results from the increased number of elements which is an important factor in this type of simulation. The computer program LS-DYNA is revealed to be a good investment in terms of numerical studies.
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Alves, Miguel António Noversa. "Simulação numérica do comportamento ao impacto de estruturas com resposta adaptada à intensidade do choque." Master's thesis, 2012. http://hdl.handle.net/1822/22692.

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Dissertação de mestrado integrado em Engenharia Mecânica
Hoje em dia, na indústria dos transportes existe uma grande preocupação em desenvolver as novas estruturas para que maximizem a absorção da energia resultante de um possível impacto, protegendo desta forma os seus ocupantes. Por outro lado, os Engenheiros actuais enfrentam outro grave problema com a questão da poluição ambiental pelo que é imperativo que o novo desenvolvimento de estruturas para veículos tenha como principio a maior redução possível do peso das mesmas, sem que se prejudique a segurança dos seus ocupantes. Até aqui reduzir o peso de uma estrutura, mantendo a mesma capacidade de absorção de energia, requeria a utilização de materiais mais resistentes e, consequentemente, de custo mais elevado. A alternativa passa pela utilização dos mesmos materiais mas mudando a estratégia de absorção de energia, com a criação e introdução de novos dispositivos nas estruturas dos veículos, concebidos especialmente com esse propósito. Assim sendo, neste trabalho será apresentada uma abordagem alternativa relativamente à absorção de energia, em que se recorre à pressurização interna das estruturas por forma a compensar uma eventual redução da espessura do material que a constitui. Serão realizadas simulações numéricas de impacto axial numa estrutura tubular de paredes finas com secção transversal circular, que se apresentará como uma aproximação a uma longarina frontal de um veículo automóvel. O objectivo principal deste trabalho consiste em estudar o efeito da sua pressurização interna, no âmbito de uma perspectiva de crashworthiness, bem como a possibilidade de se efectuar uma redução na espessura de parede, reduzindo também o seu peso. Pretende-se obter a mesma resposta ao choque que na situação de não pressurização e de espessura de parede maior. Será utilizado o software LS – DYNA™ para efectuar as simulações numéricas.
Today, in the transport industry there is great concern in developing new structures to maximize the absorption of energy resulting from a possible impact, thereby protecting its occupants. Moreover, the present Engineers face another serious problem with the problem of environmental pollution and it is imperative that the new development of structures for motor vehicles as a principle has the greatest possible reduction of the weight thereof, without being detrimental to the safety of its occupants. So far reducing the weight of a structure while retaining the same ability to absorb energy, required the use of more resistant materials and, consequently more expensive. The alternative is the use of the same materials but changing the strategy for energy absorption, and the creation of new devices introduced in the structures of vehicles specially designed for this purpose. Therefore this study is presented an alternative approach for the absorption of energy, which uses the internal pressurization of the structures in order to compensate for any reduction in the thickness of the material that constitutes it. Numerical simulations will be conducted on axial impact of thin walled tubular structure with circular cross section, which is present as an approximation to a front beam of a motor vehicle. The main objective of this work consists in studying the effect of its internal pressurization, within a perspective crashworthiness, as well as the possibility to effect a reduction in wall thickness also reduces the weight thereof. The aim is to achieve the same response to shock in a situation of no pressurization, and a wall thickness larger. Will be used software LS - DYNA ™ to perform numerical simulations.
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Conference papers on the topic "LS-DYNA impact simulation"

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Mahmadi, K., N. Aquelet, and M. Souli. "High Explosive Impact Analysis Using LS-DYNA." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1969.

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In order to realize numerical simulation of fast transient events, some wave propagation codes, which allow studying the time resolved development of shock wave propagation due to penetration, and detonation, were developed. In this article, Eulerian Multi-material and Arbitrary Lagrangian Eulerian formulations are used. Both formulations have already been used with success in the simulation of fluid with large motion such as the tank sloshing modeling, the overdriven detonation or the simulation of metal cutting processes. This article describes an air-blast simulation using an explicit finite elements code LS-DYNA. The main aim of this investigation is to compare numerical results with experimental results in order to prove the abilities of Eulerian Multi-Material and ALE formulations to treat air-blast problem using an explicit finite element method.
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Liu, Zhong-Wei, Yuzhe Yu, and Qi Zhai. "Impact Characteristics Simulation Analysis of High Pressure Valve Based on Workbench/ls-Dyna." In 2019 International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS). IEEE, 2019. http://dx.doi.org/10.1109/icitbs.2019.00070.

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Deng, Yingjian, and Yuzhe Yu. "Impact Characteristics Simulation Analysis of High Pressure Valve Based on Workbench/ls-Dyna." In 2019 International Conference on Virtual Reality and Intelligent Systems (ICVRIS). IEEE, 2019. http://dx.doi.org/10.1109/icvris.2019.00013.

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Vasanthanathan, A., P. Nagaraj, and J. Jerold John Britto. "Finite Element Modeling and Simulation of CFRP Shells Under Axial Impact Using LS-Dyna®." In 5th International Congress on Computational Mechanics and Simulation. Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-1139-3_115.

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Bielenberg, Robert W., John D. Rohde, and John D. Reid. "Design of the SAFER Emergency Gate Using LS-DYNA." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81078.

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In recent years, NASCAR and the Indy Racing League have improved the safety of their racetracks through the installation of the Steel And Foam Energy Reduction barrier (SAFER). The new barrier consists of a high-strength, tubular steel skin that distributes the impact load to energy-absorbing foam cartridges in order to reduce the severity of the impact, extends the impact event, and provides the occupant of the race car additional protection. During installation of the SAFER barrier, the designers realized that certain race tracks were designed with the emergency track exit in the outside of the corner. Because the SAFER barrier needed to be installed in these corners, a gate mechanism had to be designed for the barrier that would provide access to the track while retaining the safety performance of the system. Full-scale crash testing of the first SAFER gate design showed that the gate did not posses sufficient capacity to handle the loads experienced during a worst-case impact scenario. Non-linear finite element analysis was then used to redesign the gate mechanism. The original gate design was simulated using LS-DYNA in order to validate the computational model. Modifications to increase the capacity of the gate mechanism were designed and analyzed until suitable results were obtained through simulation. Finally, the redesigned SAFER gate was successfully full-scale crash tested.
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Kılıc¸, Namık, Atıl Erdik, and Bu¨lent Ekici. "Simulation of Impact and Fragmentation With the Meshless Methods." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25064.

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High velocity impact and penetration problems include large deformation, erosion, high strain rate dependent nonlinear material behavior and fragmentation. Therefore, meshless methods seem to be ideally suited for the modeling of penetration events as they allow unrestricted deformation and easy tracking of material interfaces and loading histories. In the first part of this study, a brief overview about meshless methods is given. Also the most important features of meshless methods with respect to mesh based approaches are compared. In the second part, numerical model is developed using one of the most frequently used meshless method, Smoothed Particle Hydrodynamics (SPH). 3D numerical simulations are performed on a high performance computer using MPP version of the explicit finite element code LS-Dyna. For reasonable behavior of material response under dynamic loading, Johnson Cook material models for armor steel target and 7,62 armor piercing projectile are derived using SHPB (Split Hopkinson Pressure Bar) test data. SPH computational investigation is compared with available experimental data such as penetration depth and impact crater diameter. For the future work, other potential meshless methods for ballistic impact problems are identified.
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Gabrys, Jonathan W., and Joshua K. Schatz. "Simulation of a CH-47 Water Crash Event." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1467.

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According to a Naval Aircraft Crash Report for 1972 to 1981, 45.3 % of helicopter mishaps occurred on water. For these incidents, the landing gear would not be effective. Instead, the lower portion of the helicopter is directly involved. Understanding how a helicopter reacts to such loading is critical for designing them to survive these incidents. This analysis investigates a CH-47 water crash event for various impact-speeds and predicts pilot accelerations during each event. The finite element analysis package LS-DYNA was used to simulate the fluid structure event between a full CH-47 model and water.
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Becker, Marvin, Marina Seidl, Miriam Mehl, and Mhamed Souli. "Automatic Mesh-Generation (FEM/SPH) for HVI-Simulations of Arbitrary Rotational Symmetric Impactors." In 2019 15th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/hvis2019-080.

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Abstract For the numerical description of high velocity impact, Smooth-Particle-Hydrodynamics (SPH) has gained more and more interest. The standard Lagrangian Finite-Element (FE) approach has difficulties in describing large deformations and fracture. However, a simulation based on SPH only is very expensive due to the small size of the particles. A well adopted solution to this is to couple both methods, using SPH only where it is necessary, and capturing the outer boundary conditions with a bias FE-mesh correctly - without considerable extra computational cost. We apply such a hybrid approach in LS-DYNA® for the characterization of threats in terminal ballistics. Different meshing approaches for the projectile and target were implemented to guarantee an optimal initial condition. The particle size and the required size of the SPH-region were studied to exclude discretization effects. Exemplarily, a projectile surrogate with simplified geometry is investigated for a fixed impact velocity and two different angles of obliquity. A qualitative comparison between experiments, observed with X-ray cinematography, reveals a good potential of this approach towards predicting fracture and ricochet during high velocity impact events.
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9

Dou, Yangqing, and Yucheng Liu. "Computational Study of Lateral Impact Behavior of Pressurized Pipelines." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62971.

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This paper presents a computational study to investigate the crash responses and collapse mechanisms of pipelines subjected to lateral impact. Influence of internal pressure of the pipelines on their lateral impact behavior is revealed through a serious of numerical crashworthiness analysis. FEA software package, LS-DYNA, is used to model the pressurized pipelines and perform the crashworthiness analysis. The simulation results provide a substantial background for the future experimental study to completely investigate dynamic responses and failure modes of pipelines subjected to low-velocity lateral impact. The results presented in this paper also have potential benefits on research of safety and reliability of civil pipelines and development of advanced pipelines materials.
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10

Dick, Matthew G., and John D. Reid. "Railcar Wheel Flat Impact Analysis." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59121.

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Wheel flats are common railcar wheel defects that cause bearing failures and train derailments. In an effort to better understand the impacts created by a wheel flat, a nonlinear finite element model using LS-DYNA was created of a single 914.4 mm (36 in) railcar wheel with a wheel flat and a 3.24 m (127.5 in) half track with one rail, six wood ties and tie plates. Discrete element springs and dampers simulated the ballast and subgrade. Goals of this model were to accurately simulate a wheel flat impact at varying speeds and to monitor the plastic deformation that occurs at the sharp edges of the wheel flat during rotation. Producing and validating this model then could be used to test modifications to the track and wheel to lower the severity of wheel impacts. Results indicated an accurate simulation; however, improvements with the material properties, suspension model and mesh sensitivity can be made.
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