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3rd European LS-DYNA Conference
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PARALLEL PERFORMANCE OF LS-DYNA ON THE NEXT GENERATION OF COMPUTER SYSTEMS
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Jeff Zais - IBM
LS-DYNA is available on a wide variety of computer platforms, ranging from commonplace personal
computers to sophisticated vector processors to high-performance scalable servers. This presentation will
review historical LS-DYNA performance and look forward to what can be expected in the next generation of
computer platforms.
The capability of available computer platforms always has a bearing on what type of simulations LS-DYNA
end users can ...
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OPTIMISATION AND ROBUSTNESS OF SIDE AIRBAG DESIGN AND ANALYSIS
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Tayeb Zeguer - Jaguar cars
In order to yield significant added value, computer model need to reach to a level of reliability that enables
decisions, which are only based on simulation results. Airbag deployment is highly non linear and non
reproducible. Scatter in all system properties and boundary conditions also cause scatter in the performance
of the system. The aim of this paper is to use stochastic simulation approach to include this natural scatter
into the ...
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OPTIMIZATION OF STIFFENED LAMINATED COMPOSITE CYLINDRICAL PANELS IN THE BUCKLING AND POSTBUCKLING ANALYSIS.
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A. Korjakin, A.Ivahskov, A. Kovalev
Stiffened plates and curved panels are widely used as primary structural elements in aerospace, marine and civil
engineering. Their stable postbuckling behavior and their capability to sustain loads far in excess of their initial buckling
loads may lead to considerable weight savings, if their postbuckling strength is fully utilized and possible fatigue problems
are eliminated. In the presence of large deflections, bifurcations, load and ...
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SIMULATION OF A DETONATION CHAMBER TEST CASE
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Daniel Hilding - Engineering Research Nordic AB
The purpose of a detonation chamber is to ensure vapor and fragment containment during the destruction of
explosive munitions. The toxic vapors generated by the detonation can be vented into a filtration unit.
Compared to free air detonations, the use of a detonation chamber reduces the environmental impact of
munitions destruction.
The manufacture and testing of a detonation chambers is time consuming and expensive. At present, new
designs ...
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A review of the state-of-the-art in vehicle modeling for crashworthiness analysis using LSDYNA
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Paul du Bois
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NUMERICAL SIMULATION OF THE WOOD RESPONSE TO THE HIGH VELOCITY LOADING .
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J. Buchar - Mendel University of Agriculture and Forestry, Czech Republic
J. Voldrich - Research Center of the West Bohemia University, Czech Republic
The experiments where the freely supported spruce beams have been loaded by the detonation of an explosive charge have been evaluated using of the numerical simulation. The explicit Lagrangean finite element code LS DYNA 3D has been used to analyse the beam response. The wood has been considered as global orthotropic linear elastic material with a material damage. The material damage has been described by the strain at the wood failure. This ...
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IN BORE BEHAVIOUR OF LARGE CALIBRE ARMOUR PIERCING FIN STABILISED DISCARDING SABOT PROJECTILES.
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N.Eches, N.Paugain, C. Doffémont - Giat Industries
The efficiency of large calibre armour piercing fin stabilised discarding sabot projectiles (APFDS) is primarily linked to their terminal ballistics performances. But other parameters, such as its accuracy and its yaw at the impact have also a large influence on the performance. These two parameters magnitude, as well as the survivability of the projectile during the launch phase are greatly affected by the interaction between the projectile and ...
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SOME EXAMPLES OF ENERGETIC MATERIAL MODELLING WITH LSDYNA
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Michel QUIDOT -SNPE Propulsion – Centre de Recherches du Bouchet
SNPE is using DYNA codes for more 15 years for characterisation and modelling of energetic materials : high explosives, solid propellants, gun propellants and pyrotechnic systems for functioning, safety, survivability and vulnerability analysis in space and defence applications. This paper presents some examples of the use of LSDYNA in the field of solid mechanics, fluid mechanics and detonics. The first example concerns the development of a ...
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CHARACTERIZATION AND COMPONENT LEVEL CORRELATION OF ENERGY ABSORBING (EA) POLYURETHANE FOAMS (PU) USING LS-DYNA MATERIAL MODELS
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Babushankar Sambamoorthy - Lear Corporation
Polyurethane (PU) foams are one of the most widely used countermeasures for head impact protection. For accurate prediction of the head injury parameters, studies were conducted to establish a reliable LS-DYNA[1] material model to characterize PU foams. A 5.0pcf (80.09 g/l) PU foam was characterized using four different material models available in LS-DYNA for simulating foams, namely MAT_LOW_DENSITY_FOAM (MAT57), MAT_CRUSHABLE_FOAM (MAT63), ...
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FINITE ELEMENT ANALYSIS OF DUCTILE FAILURE IN STRUCTURAL STEEL SUBJECTED TO MULTIAXIAL STRESS STATES AND HIGH STRAIN RATES
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T. Børvik, O.S. Hopperstad, S. Dey, M. Langseth - Norwegian University of Science and Technology
T. Berstad - LSTC
Notched specimens of the structural steel Weldox 460 E have been tested at high strain rates in a Split Hopkinson Tension Bar. The aim was to study the combined effects of strain rate and stress triaxiality on the strength and ductility of the material. It is further considered important to obtain experimental data that may be used in validation of constitutive relations and fracture criteria. The force and elongation of the specimens were ...
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WEB-CENTRIC LS-DYNA
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Henry H. Fong HPC Marketing – Enterprise Systems Products Sun Microsystems
The Internet has changed the way business is done – and High Performance Computing (HPC) is no exception. Many firms have launched “dot-com” software to facilitate B2B collaboration, outsource jobs, provide engineering services, or exchange data with suppliers and partners. Recently, however, hundreds of dot-coms have failed, and many high-tech companies have laid off thousands of workers. Now what? The term ASP (application service provider) ...
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LS-DYNA PERFORMANCE ON ULTRASPARCTM -III SERVERS AND WORKSTATIONS
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Youn-Seo Roh, Henry H. Fong - Sun Microsystems
Sun Microsystems recently announced a new line of high-performance Sun FireTM Midframe servers and Sun BladeTM 1000 workstations based on 750-MHz UltraSPARC-III microprocessors. These new computers offer exceptional performance for numerically intensive MCAE applications at reasonable prices. This paper presents single- and multi-processor performance and scalability results of LS-DYNA running on these systems. Results of both OpenMP and MPI ...
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ESTIMATION OF THE TRANSVERSE CRUSH RESISTANCE OF A SECTION OF THE T23 FRIGATE
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Dr. G.S. Kalsi - Cranfield University, UK
Ocean-going vessels are very complex structures, and can have displacements ranging from hundreds to tens of thousands of tons. In the case of bulk carriers and tankers, this can be as much as half-a-million tons. When in motion, they can possess very large amounts of kinetic energy even if their velocities are small. They therefore have the potential to cause serious damage in case they are involved in a collision. Ships moving in ports or ...
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DEVELOPMENT AND VALIDATION OF A US SIDE IMPACT MOVEABLE DEFORMABLE BARRIER FE MODEL
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Abdullatif K. Zaouk, Dhafer Marzougui - The George Washington University
Automotive safety regulations vary in different parts of the world. Dynamic side impact regulations, for example, are different than the ones in Europe. United States National Highway Traffic Safety Administration (NHTSA) and the European Union (EU) have each produced their own distinct testing procedures such as different deformable barriers, impact configurations and anthropomorphic test devices (dummies). Although both test procedures have ...
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NUMERICAL SIMULATIONS OF DUCTILE FAILURE IN EXTRUDED ALUMINIUM ALLOYS USING A COUPLED MODEL OF ELASTO-PLASTICITY AND DAMAGE
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O.-G. Lademo, O.S. Hopperstad, T. Berstad, M. Langseth - Structural Impact Laborator
A test programme has been carried out to establish the mechanical properties of three extruded aluminium alloys. The investigated alloys exhibited significant anisotropy in strength, plastic flow and ductility. The anisotropy is mainly due to crystallographic texture, and an anisotropic yield criterion is needed to describe the mechanical behaviour. Several yield criteria were evaluated against the experimental data. The yield criterion Yld96 ...
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CRASH-SIMULATION OF HAT-SECTIONS RELIABILITY OF THE NUMERICAL MODEL
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Paul Du Bois - consulting engineer
Thomas Frank - Daimler-Chrysler
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IMPROVING THE IMPACT RESISTANCE OF MASONRY PARAPETS
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G. Beattie, T.C.K. Molyneaux - University of Liverpool
M.Gilbert, B.Hobbs, S.Burnett, P. Newton - University of Sheffield
D.A.Gration - Arup Advanced Technology Group
There are over 60000 masonry bridge parapets in the UK. Whereas steel and concrete parapets are well covered by design standards masonry parapets are not. Initially LS-DYNA was used to model vehicle impacts on various forms of masonry parapet. The results were encouraging, with good qualitative agreement between tests and analysis. The same finite element modelling strategy was subsequently used to help develop a guide for assessment (County ...
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ON TECHNIQUES FOR SIMULATING EFFECTS OF CAVITATION ASSOCIATED WITH THE INTERACTION BETWEEN STRUCTURES AND UNDERWATER EXPLOSIONS USING LS-DYNA
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Q.W. Ma, D.J. Andrews - University College London
In this paper, a two-step technique is suggested to reduce the reflection of shock waves from a truncated boundary without significantly smearing the incident shock wave and to suppress spurious oscillations without significantly affecting accuracy. By comparing the results for a one-dimensional case with a wellknown analytical solution, it is shown that the technique works very well.
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SIMULATIONS OF HYPERVELOCITY IMPACTS WITH SMOOTHED PARTICLE HYDRODYNAMICS
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Dominique Lacerda, Jean-Luc Lacome - DYNALIS, France
This paper is devoted to the results of Smoothed Particle Hydrodynamics (SPH) simulations of high velocity impacts on thin aluminium plates using LS-DYNA computer code. The numerical results of the damage produced on plates are compared with experimental data. Two simulations are presented : - An aluminium sphere impacting an aluminium plate at 6.64 km/s - A steel sphere impacting an aluminium plate at 5.53 km/s Experimental and numerical ...
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Modelling of an automobile tyre using LS-DYNA3D
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W. Hall, R. P. Jones, J. T. Mottram - University of Warwick
This paper describes a finite element model used to investigate the quasi-static behaviour of a stationary automobile tyre vertically loaded against a stiff horizontal surface. The model includes a representation of the tyre, a steel wheel and surface. The tyre is represented in detail by a number of tyre components, the wheel and surface are coarsely modelled. LS-DYNA3D is used to simulate the inflation of the tyre, the fit between the tyre ...
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AN EXPERIMENTAL AND NUMERICAL STUDY ON THE ENERGY ABSORBING CAPABILITY OF ALUMINUM EXTRUSIONS UNDER OBLIQUE LOADING
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A. Reyes, M. Langseth, O. S. Hopperstad - Structural Impact Laboratory
Oblique loading was studied through static experiments and numerical simulations. The behavior of square aluminum columns in alloy AA6060 subjected to oblique loading was investigated experimentally for three different load angles. The square columns were clamped at one end and oblique load conditions were realized by applying a force with different angles to the centerline of the column. Numerical simulations were later carried out to validate ...
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PARALLEL ENGINEERING SIMULATIONS BASED ON FORMING SIMULATION OF A HEAT EXCHANGER PLATE
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Gabrielson P. - Alfa Laval Lund AB
Thuvesen D. - The Swedish Institute of Production Engineering Research
Normally, simulation regarding computational fluid dynamics (CDF), structural mechanics and heat transfer simulations in sheet metal applications are made without a forming simulated part. Instead the simulation is based on especially constructed parts, with some kind of nominal geometry, only for the specific simulation. This paper presents the use of sheet metal forming simulation of an advanced thin sheet metal part as input to other ...
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EFFECTIVENESS OF COUNTERMEASURES IN RESPONSE TO FMVSS 201 UPPER INTERIOR HEAD IMPACT PROTECTION
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Arun Chickmenahalli - Lear Corporation Michigan, USA
Analysis and development of countermeasures in meeting vehicle upper interior free motion headform (FMH) impact safety requirement (FMVSS 201) has become an important aspect for engineers. FMVSS 201 safety regulation stipulates that the Head Injury Criterion, HIC (d) should be less than 1000 when a FMH is impacted at a speed of 15 mph. The interior components of a vehicle generally do not generate high HIC (d) numbers by themselves but the steel ...
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THE GENERATION OF A MATERIAL MODEL TO REPRESENT THE MECHANICAL BEHAVIOUR OF AN ALIPHATIC POLYETONE (CARILON EP) AT HIGH STRAIN RATE EVENTS AND LOW TEMPERATURES.
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Jerome P. J. Coulton - Advanced Car Technology Systems
Although explicit finite element codes have been used for many years to predict the impact performance of plastic components, there are few papers that detail how the constants for material models were determined and the resulting models validated with experimental test results. Aliphatic polyetone materials appear very attractive materials for the developers of automotive fuel systems. This is principally due to their low fuel permeability and ...
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CHARACTERIZATION AND COMPONENT LEVEL CORRELATION OF ENERGY ABSORBING (EA) POLYURETHANE FOAMS (PU) USING LS-DYNA MATERIAL MODELS
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Babushankar Sambamoorthy, Tuhin Halder - Lear Corporation, Ford Division
Polyurethane (PU) foams are one of the most widely used countermeasures for head impact protection. For
accurate prediction of the head injury parameters, studies were conducted to establish a reliable LS-DYNA[1]
material model to characterize PU foams. A 5.0pcf (80.09 g/l) PU foam was characterized using four different
material models available in LS-DYNA for simulating foams, namely MAT_LOW_DENSITY_FOAM
(MAT57), MAT_CRUSHABLE_FOAM (MAT63), ...
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FEM-PROCESS-SIMULATION OF HYDROMECHANICAL DEEP-DRAWING
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Matthias Aust - University of Stuttgart (Germany)
The FEM-Process-Simulation of metal forming processes has been proven to be useful during the design stage of
components and toolings. However, this is not valid for relatively new processes, e. g.. hydromechanical deep-drawing.
Hydromechanical deep-drawing is related to conventional deep-drawing, but the process is quite different. When using
hydromechanical deep-drawing, instead of a rigid female die a counter pressure pot is used to ...
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MODELLING THE SHAKEN BABY SYNDROME
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I.C. Howard, E.A. Patterson, J. Langley - University of Sheffield (SIRIUS)
Physical child abuse is common. For the UK alone, an informed estimate is that every year more than 200 infants die
from brain injuries inflicted by violent shaking (“Shaken Baby Syndrome”). Around twice this number, who actually
survive such treatment, are left with severe mental and physical disability including blindness due to associated damage to
the retina (the light-sensitive part of the eye). Although it is now distressingly ...
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STATE-OF-THE-ART IN THE USE OF (LS-DYNA) FORMING SIMULATION IN HYDROFORMING AND PRECEDING PROCESSES
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A. Haas, H. Bauer, I. Lerch -FH Aalen
M. Mihsein, R. Hall - University of Wolverhampton
A. Böhm - Siempelkamp Pressen Systeme GmbH & Co.
Rapid and reliable methods for component development and economic manufacturing layout are today crucial
factors for the application of hydroforming techniques in mass production of lightweight components for the
automotive industry. Optimum design of components taking into consideration special process-specific factors
enhances safety and also the cost-effectiveness. The feasibility study, the component configuration and
definition of a ...
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NUMERICAL AND EXPERIMENTAL STUDY OF SAFETY NET SYSTEMS FOR HUMAN AND EQUIPMENT SECURITY (SKI APPLICATION)
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BEN YAHIA Fayçal - DYNALIS
GOURINAT Yves - ENSICA
Human and material safety systems evolve continuously to become more perfect and face increasing requirements.
Indeed, important changes of usage conditions and precautions have been caused by the technological progress of the
various domains of life (means of transportation, sporting equipments etc.).
In order to follow this technological expansion and optimize it for the benefit of the human beings, several research
projects were ...
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ALE AND FLUID-STRUCTURE INTERACTION IN LS-DYNA
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M’hamed Souli - Université des Sciences de Lille et Technologie
A new Eulerian-Lagrangian coupling algorithm and improved multi-material ALE-capabilities have made LS-
DYNA an efficient tool for analyzing large deformation processes, such as bird strike events and forging
operations. This paper contains two example problems that illustrate the current features of the code.
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