Personal tools
Home 9th European LS-DYNA Conference

restrict search to current section
For a simple text search, enter your search term here. Multiple words may be found by combining them with AND and OR. The text in this field will be matched with items' contents, title and description.

 

9th European LS-DYNA Conference

Performance Evaluation Using LS-DYNA Hybrid Version on the K computer
Kenshiro Kondo, Hiroyuki Kanazawa (Fujitsu Limited), Kazuo Minami, Yukihiro Hasegawa (RIKEN), Hiroyuki Umetani (Japan Automobile Manufacturers Association, Inc.), Yu Setoyama, Takafumi Horita (Fujitsu Kyushu Systems Limited)
In order to improve the accuracy of the car crash analysis, the number of elements in the analytical model has been increasing rapidly. A large-scale analysis using model with 10 million elements is slowly becoming popular. Some Companies actually has been adapting large models in their crash analysis nowadays. ́7KH K computer ́> @ D KLJKO\ SDUDOOHO V\VWHP FDQ FDUU\ RXW D FDU FUDVK analysis in several hours which other supercomputers would ...
Performance Optimizations via Connect-IB and Dynamically Connected Transport Service for Maximum Performance on LS-DYNA®
Pak Lui, Gilad Shainer, Brian Klaff (Mellanox Technologies)
From concept to engineering, and from design to test and manufacturing, the automotive industry relies on powerful virtual development solutions. CFD and crash simulations are performed in an effort to secure quality and accelerate the development process. LS-DYNA® relies on Message Passing Interface (MPI) for cluster or node-to- node communications, the de-facto messaging library for high performance clusters. MPI relies on fast server ...
Plastic barrier for industrial applications - Characterization under impact loading using testing and Ls-Dyna®
C. Goubel (LIER SA), E. Di Pasquale (Sim Tech), J. Pascual (BOPLAN)
Safety structures are needed in industrial areas to protect people, machines or goods from forklift circulation. Steel roadside safety barriers are often chosen but the accuracy of these structures designed to restraint a light vehicle under a low angle but at high speed is not obvious. After several (even soft) impacts or contacts, this kind of devices suffers of a poor aspect and some parts have to be changed quite frequently. Plastic ...
Prediction of laser welding failure on seat mechanisms simulation
M. Chauffray, G. Delattre, L. Guerin (Faurecia Automotive seating), C. Pouvreau (LIMATB)
For some years, FAUREClA has chosen to industrialize LASER welding technology (Fig. 1 ) to weld it seat components, This choice is a consequence of global lightweight policy in industrial automotive world, To fully answer to this requirement Faurecia needs to join thinner parts using higher strength steels. On one seat sevenl tens of welding lines will be used to join parts with thicknesses from O.S mm to 5 mm. Conventional processes such ...
Recent Developments in Material Testing for Characterization of Materials (Deformation and Failure) for LS-DYNA Materials Models
Amos Gilat, and Jeremy D. Seidt (Ohio State University)
Several new testing methods that have been recently developed for mechanical characterization (deformation and failure) of materials are presented. The data from these tests is used for the development and calibration of material models (constitutive relations) in LS-DYNA. The first method involves the use of Digital Image Correlation (DIC) in tests that are used for generating data needed for the MAT224 model. In these tests specimens with ...
Recent Investigations of Side Curtain Airbag Deployment Simulation using CPM
Hisaki Sugaya, Kazuo Imura, Hiroyuki Mae (Honda R&D Co.,Ltd.)
Recently, Honda has shifted to a vi_ual development process to shorten the development term. In addition, the virtual development process has also been applied in the crash safety one. for this reason, it is necessary to build more accurate simulation modelling method. There are some reports, in which, airbag modelling Methods about gas flow has several technical issues [1] [2] [3I, in the crash safety components. Therefore, this research ...
Relating scatter in occupant injury time histories to instability in airbag behaviour
Richard Brown (Jaguar Land Rover), Dominik Borsotto (Fraunhofer Institute SCAI), Clemens-August Thole (SIDACT GmbH)
Dealing with natural variation in input parameters and environmental conditions presents the automotive industry with significant challenges. Lack of consideration of variability in results can lead to unpleasant surprises during testing, with a consequent risk of unplanned cost and delay. In a purely virtual product development world, analysis techniques must lead to designs that are robust with respect to external noise sources, in order to ...
Seismic Response of Baffled Liquid Containment Tanks
Zuhal Ozdemir (University of Sheffield), Yasin Fahjan (Gebze Institute of Technology), Mhamed Souli (Université des Sciences et des Technologies de Lille)
The failure of liquid storage tanks due to earthquake induced sloshing action of the liquid was extensively observed during many past major earthquakes. The destructive effects of sloshing can however be suppressed in a passive manner by introducing additional sub-structures such as baffles into tanks. The main aim of constructing these sub-structures is to alter the period of sloshing action beneficially and to increase hydrodynamic damping ...
Simplified modeling of self-piercing riveted joints for crash simulation with a modified version of *CONSTRAINED_INTERPOLATION_SPOTWELD
Matthias Bier, Silke Sommer (Fraunhofer Institute for Mechanics of Materials IWM, Germany)
The requirements for energy efficiency and lightweight construction in automotive engineering rise steadily. Therefore a maximum flexibility of the used materials is necessary and new joining techniques are constantly developed. The resulting large number of joints with different properties leads to the need to provide for each type of joint an appropriate modeling method for crash simulation. In this paper an approach for a simplified ...
Simulation of Warm Forming of 5754 Sheet Aluminium
Trevor Dutton (Dutton Simulation Ltd)
In November 2009 a project was set up to implement an innovative metal forming process into the automotive industry with the goal of producing lightweight, high accuracy, complex-shaped automotive aluminium panels using one main forming operation. The project was known as WAFT - Warm Aluminium Forming Technology - and was part-funded by the UK Technology Strategy Board. The opening premise was that increased formability could be achieved ...
Springback Analysis and Optimization in Sheet Metal Forming
Abdulaziz Alghtani, P.C. Brooks, D.C. Barton, V.V. Toropov (School of Mechanical Engineering University of Leed)
An accurate prediction of springback in sheet metal forming processes requires complex hardening material models. In this research, numerical analysis of the springback in U-bending was conducted using the well-known Yoshida model, available and known as the YU model in LS-DYNA. This model has seven main parameters which describe the behaviour of the material as it undergoes metal forming processes. Initially, mesh sensitivity studies were ...
Stochastic Simulation of Aircraft Fuselage Assembly Considering Manufacturing Uncertainties
Dietmar C. Vogt, Sönke Klostermann (EADS)
In aircraft production the use of rivets as permanent mechanical fastener to assemble lightweight sheet metal structures is very common. At assembly the rivet is placed in a through boring and the buck-tail is plastically deformed to create a second head. Thus rivets are positive locking and can carry axial tension loads. However, rivets are mainly used to transfer shear loads via the seating stress of their cylindrical shaft. The remaining ...
Stochastic Spray and Chemically Reacting Flow in LS-DYNA
Kyoung-Su Im, Zen-Chan Zhang, Jr. Grant O. Cook (LSTC)
The injection of fuel sprays into an automotive engine and liquid jets into a high-speed flow stream is an important process in modern automotive gasoline and diesel engines, and propulsion in gas turbine and supenonic vehicles. ln such applications, the combustion peformance depends strongly on spray atomization, penetration, and the mixing process bemeen the free stream air and the liquid fuel. As a result, the study of liquid spray in ...
Strain-softening in continuum damage models: Investigation of MAT_058
Karla Simone Gemkow, Rade Vignjevic (Cranfield University)
Composite materials are of increasing interest to automotive and aviation industry due to their high strength and stiffness. Therefore they are commonly used to replace metallic materials. However their mechanical behaviour is complex, especially when damage is considered. Composite damage leads to degradation of material properties which results in behaviour known as strain-softening. ® An implementation of strain-softening in numerical ...
The pressure response in the brain during short duration impacts
C. Pearce, P.G. Young (University of Exeter), L. Cowlam, and B. Walker (Arup)
The mechanisms which lead to brain injury in response to blunt head impacts are investigated using three finite-element models of the human head, which range from low to high biofidelity. The models were developed directly from MRI image data using a technique adapted from the marching cubes approach which automates the generation of meshes and allows for a number of different structures (e.g. skull, scalp, brain) to be meshed ...
Time and rate dependent constitutive model coupled with nonlocal damage at finite strains for semi-crystalline polymers
Romain Balieu, Franck Lauro, Bruno Bennani (Univ Lille Nord de France), Tsukatada Mastumoto, Ernesto Mottola (Toyota Motor Europe)
Many constitutive models were developed in the literature to model the complex behaviour of polymer materials. These models can be sorted in two categories: the physical based models where the microstructure of the material is taken into account for representing the macroscopic behaviour [1,2] and the phenomenological based models where the material discontinuities, in the microstructural scale, are homogenised in a representative volume ...
Topology optimisation method for crashworthiness design using Hybrid Cellular Automata and thin-walled ground structures
Stephan Hunkeler, Milan Rayamajhi (Queen Mary University of London), Fabian Duddeck (Technische Universität München)
Crashworthiness is one of the most demanding design cases for vehicle structures. Until a few years ago, it was mainly addressed using trial and error approaches; but recently, automated structural optimisation for crashworthiness design got more and more popular. So far, most relevant applications use size or shape optimisation. Nevertheless, the ultimate way to achieve significant mass reduction is to use topology optimisation. While ...
Transitioning From SMP To MPP-DYNA3D For The Simulation Of Large Thermal-structural Implicit Problems
Dr. Gurdip S. Kalsi (AWE)
The LS-DYNA family of codes have been used at AWE for many years. For a long time they were used on our shared memory platforms (SMPs) to carry out implicit structural and coupled thermal- structural analyses, amongst others. Over time processor speeds have continually increased and larger memory has become available at reducing costs. This has led to an increase in the size of models as meshes have been refined for better definition and ...
Transmissionlosssimulation of acoustic elements in LS-DYNA®
Marko Krebelj (Akrapovič d.d.)
This paper presents validated simulations of transmission loss in LS-DYNA for basic acoustic elements in exhaust systems. According to [1] there are several indicators available that describe the acoustic performance of an exhaust system and its components. These mainly include transmission loss (TL), insertion loss (IL) and noise reduction (NR). The TL is a ratio of sound power level between the inlet wave entering and the transmitted wave ...
Ultra High Power applications designed using the LS-DYNA EMAG solver
Gilles Mazars, Gilles Avrillaud, Anne-Claire Jeanson, Jean-Paul Cuq-Lelandais (Bmax)
Bmax offers industrial solutions based on Ultra High Power (UHP) technology and provides manufacturing solutions for Magnetic Pulse (MP) Forming, Welding and Crimping as well as Electro- Hydro-Forming (EHF) processes. The LS-DYNA® Emag solver version 1.7 used in the Eddy’s current approximation allows modelling different parts of the system like coils, workpieces and the dynamic interactions between them. This module is used as an advanced ...
Unsteady Aerodynamic Analysis around Oscillating Ahmed body by LS-DYNA ver.980
Hiroyuki Sawamoto Tsuyoshi Yasuki, Hiroshi Tanaka, Kazuyoshi Ishii (Toyota Motor Corporation)
This paper describes an aerodynamic effect of the Ahmed body model in sinusoidal pitching motion. Relationships of pitching angle to lift coefficient were analyzed by computational fluid dynamics (CFD) of LS-DYNA ver.980. Those numerical results showed good agreements with wind tunnel test results reported in the past. The flow field was investigated by using this numerical analysis result and the relationship of bottom surface pressure ...
UsingLS-OPT for Parameter Identification and MAT_FABRIC with FORM=-14
David Dubois (Autoliv), Jimmy Forsberg (DYNAmore Nordic AB)
This work was carried out as a methodology development project in a joint venture between Autoliv and DYNAmore Nordic AB. The outset of the project was to obtain a better component behavior due to a more realistic material behavior in the simulation of airbag models. The observation underlying the project was that the current fabric model used in most airbag models is *MAT_FABRIC and FORM=14. In FORM=14 there is no consideration taken to a ...
Validation of Mine Blast Simulations with Field Tests
İlker Kurtoğlu, Berkay Salihoğlu, Y. Caner Taşan, Gökhan Tekin (FNSS Savunma Sistemleri A.S.)
In this work, LS-DYNA® simulation results of mine blast of flat aluminum/steel plates and validation studies using mine blast tests are presented. The buried mine simulations are performed using ALE initial volume fraction and SPH methods. The high strain rate Johnson Cook material models of the plates are obtained through Split Hopkinson Pressure Bar tests, for both high strength steel and aluminum specimen. The soil parameters such as ...
Validation ofModel fora Thermoplastic Composite Material Low Carbon Vehicle Applications
Oliver Tomlin (GRM Consulting Ltd), Neil Reynolds (WMG, University of Warwick)
The methods developed for creating and validating a thermoplastic composite (TPC) material model in LS-DYNA are presented. Included are details of the mechanical characterisation methods and test types required to fulfil the input requirements of MAT058. Model input data are validated through correlation between coupon and sub-system physical tests and simulations with justification of the boundary conditions. The test methods are explored ...