Personal tools
Home → 6th 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.

 

6th European LS-DYNA Conference

Developments in Occupant and Seat Modelling with Primer 9.3
Miles Thornton, Richard Sturt, Chris Bell - Arup
There is constant pressure to reduce the time needed to process design data into crash results (mesh, assemble, create different crash cases, check, run, post-process). The meshing step has been reduced by batch meshing technology, and progress has been made in several other areas such as automatic post-processing. Attention is now turning to the remaining bottlenecks, which include occupant and seat positioning. These steps require careful ...
New developments in LS-OPT Version 3.2
Nielen Stander, Willem Roux - Livermore Software Technology Corporation
An overview of LS-OPT features is given with special emphasis on the major new optimization features available in LS-OPT Version 3.2. These include GUI support for parameter identification, confidence intervals for individual optimal parameters, point plotting as an enhancement to 3-D metamodel plotting, matrix expressions, coordinatebased result extraction and retry features for job distribution
A COMPARATIVE REVIEW OF DAMAGE AND FAILURE MODELS AND A TABULATED GENERALIZATION
P.A. Du Bois - Consulting Engineer, Germany
S. Kolling, M. Feucht - DaimlerChrysler AG, Germany
A. Haufe - Dynamore GmbH, Germany
Reliable prediction of damage and failure in structural parts is a major challenge posed in engineering mechanics. Although solid material models predicting the deformation behaviour of a structure are increasingly available, reliable prediction of failure remains still open. With SAMP (a Semi-Analytical Model for Polymers), a general and flexible plasticity model is available in LS-DYNA since version 971. Although originally developed for ...
A Functional Bayesian Method for the Solution of Inverse Problems with Spatio-Temporal Parameters
Zenon Medina-Cetina - International Centre for Geohazards / Norwegian Geotechnical Institute
Roger Ghanem, Amy L. Rechenmacher - University of Southern California
A Functional Bayesian (FB) methodology is introduced for the calibration of constitutive parameters spatially distributed within a model. The probabilistic solution to the inverse problem consists of assimilating the uncertainty captured from the actual material responses into the material parameters. A case study is introduced to illustrate the applicability of the method, where a soil model built in LS-DYNA is parameterized using surface ...
A New Impact Scenario for P-V Tram Certification
M. Anghileri, L. Castelletti, M. Pirola, F. Pistochini, S. Raiti- Politecnico di Milano, Italia
Tram crashworthiness is getting a more and more demanding issue. Simulations carried out to verify that the new tram AnsaldoBreda Sirio-Milano fulfils the prEN 15227 requirements for certification are here described. Besides a new impact scenario with characteristics closer to trams accidents is proposed. Structural enhancements so that the tram fulfils also the more severe impact condition of the new scenario are introduced.
Accurate and efficient dummy models for occupant safety design
 
Advanced Finite Element Model for AE-MDB Side Impact Barrier
M. Asadi , P. Tattersall - Cellbond Composites Ltd.
B. Walker - ARUP Campus (UK)
H. Shirvani - Anglia Ruskin University (UK)
This paper represents a new Finite Element simulation model for AE-MDB v3.9 side impact barrier and proposes a method on creating suitable assumptions and material data. Cellbond AE-MDB barrier investigation was carried out to produce an advanced FE model. Experimental Flat Wall and Offset Pole test results were used to validate the accuracy of the developed models. The explicit LS Dyna 3D code was used to model the geometries, and the Material ...
Advanced Simulations of Cellular Structures with LS-DYNA
Matej Vesenjak, Zoran Ren - University of Maribor
Cellular structures have an attractive combination of physical and mechanical properties and are being increasingly used in modern engineering applications. In this study the influence of different parameters (type of base material, type of pore filler, relative density, size of the cellular structure, strain rate) on behaviour of open- and closed-cell cellular structures under impact loading was investigated by means of computational ...
Advances in Adaptive Thermal-mechanical Metal-forming Simulations in LS-DYNA
Rudolf Bötticher - TMB GmbH
The vision of LS-DYNA is to become multiphysics and adaptive. LSTC endeavours to make the LS-DYNA code as complete, accurate and easy to use as possible. This contribution evaluates the features for adaptive thermal-mechanical simulations that are in recent LS-DYNA versions with a focus on implicit 3D. Implicit solutions do not need mass scaling as explicit forming simulations often use. Implicit element free Galerkin (EFG) elements are ...
AIRBAG SIMULATION WITH LS-DYNA PAST – PRESENT – FUTURE
A. Hirth - DaimlerChrysler AG, Germany
A. Haufe - Dynamore GmbH, Germany
L. Olovsson - IMPETUS Afea AB, Sweden
During the last decade the simulation of the airbag deployment process has become a standard application of explicit finite element codes. At the beginning of the development the focus was to capture the influence and improve the results of dummy impact on fully inflated airbags. Later the deployment kinematics of folded airbags, different folding techniques and vent-hole design became more and more important. With the requirement to comply with ...
ALE Modeling of Surface Waves
AQUELET Nicolas - Livermore Software Technology Corporation
An Arbitrary Lagrange Euler formulation for the propagation of surface waves is developed in LS-DYNA®. The ALE computational time step in this code is divided in two cycles: a Lagrangian cycle in which the mesh follows the material deformation and an advection cycle in which the users through remapping algorithms control the mesh motion. The new feature presented in this paper is one of these remapping algorithms. It enables a Lagrangian ...
Application of Shell Honeycomb Model to IIHS MDB Model
Shigeki Kojima - TOYOTA TECHNICAL DEVELOPMENT CORPORATION
Tsuyoshi Yasuki, Koji Oono - Toyota Motor Corporation
This paper describes a new finite element modeling method of Aluminum honeycomb using shell elements. It is our new modeling method that cell size of honeycomb structure is enlarged to increase time step size for FEM analysis, and compressive strength is controlled by thickness of shell elements. New modeling method was applied to IIHS moving deformable barrier model, and side impact analysis with a full vehicle model was performed. The result ...
Concept Design of an A-Pillar Mounted Airbag for Pedestrian Head Protection
Jianfeng Yao, Jikuang Yang - Chalmers University of Technology
Accident investigations have shown that in pedestrian-versus-vehicle accidents, windshield edges, A-pillars, cowls are the main sources for severe head injuries due to their high stiffness. To mitigate head injury severities, it is necessary to improve the safety performance of these structures. An A-pillar mounted airbag system (AMAS) was devised with the aim to prevent head from directly impacting against stiff structures such as A-pillars, ...
Contact and Sliding Simulation of Rubber Disk on Rigid Surface with Microscopic Roughness
Sunao Tokura - JRI Solutions, Ltd.
It is crucial to obtain detailed information about frictional interaction between tire and road surface to estimate performance of vehicle brake system or tire on real road surface. Simulation using Finite Element Method (FEM) in addition to experimental procedure is regarded to be useful to investigate contact behavior between tire and road surface. However, indeed, it is difficult to apply FEM simulation for such a problem since contact and ...
Corpuscular method for airbag deployment simulations
Lars Olovsson, IMPETUSAfea AB
 
Current features and developments of LS-PREPOST
P. Ho - Livermore Software Technology Group
 
Deployment Simulations of Space Webs
M. Gärdsback, G. Tibert - Royal Institute of Technology
 
DEVELOPMENT AND EVALUATION OF A CONTINUUM NECK MUSCLE MODEL
S. Hedenstierna, P. Halldin, K. Brolin - Royal Institute of Technology, Stockholm, Sweden
The Finite Element method is a powerful tool for analyzing the biomechanics of the human body. One area that has attracted increasing attention is the cervical musculature and its influence in neck injury mechanisms. Most cervical FE models of today use spring-elements as muscles and are limited to discrete geometries and nodal output results. A solid-element muscle model however, will improve the geometry and add properties such as tissue ...
DEVELOPMENT OF ADVANCED HUMAN MODELS IN THUMS
Masami Iwamoto, Yuko Nakahira, Atsutaka Tamura, Hideyuki Kimpara, Isao Watanabe, Kazuo Miki - Toyota Central R&D Labs., Inc.
A finite element model of human body called THUMS has been developed to predict gross motions and multiple skeletal injuries of a whole human body during impacts. Recently, we have developed a head/brain model and thoracic/abdominal internal organ models to evaluate more severe injury risks for occupants and pedestrians in automotive accidents. The head/brain model was validated against some test data on translations and rotations of the head ...
Development of BioRID II Dummy Model using Stochastic Methods
Sebastian Stahlschmidt, Bastian Keding, Katharina Witowski, Heiner Müllerschön, Uli Franz - DYNAmore GmbH, Stuttgart, Germany
Consumer and insurance organizations use the BioRID II dummy as test device to assess the risk of whiplash injuries in rear crash scenarios. DYNAmore GmbH developed a finite element model for LS-DYNA of the BioRID II dummy in cooperation with the German Automotive Industry (FAT). The project follows the updated development guidelines of successfully developed models for the FAT in previous projects. This paper describes the applied development ...
Development of validated Finite element model of a rigid truck suitable to simulate collisions against road safety barriers
M. Pernetti - Second University of Naples
S. Scalera - University of Naples "Federico II"
The effectiveness of FEM (Finite Element Method) to improve the crashworthiness, both of the vehicle and of the road safety hardware, has been plainly demonstrated in literature. As well known, such a methodology can be successfully employed (i) as a support to design novel devices and (ii) as a tool to perform parametric studies to assess the influence of different factors. Of course this is possible only when available models are calibrated in ...
Development of validated Finite element model of an articulated truck suitable to simulate collisions against road safety barriers
M. Pernetti - Second University of Naples
S. Scalera, G. Cibllis - University of Naples "Federico II"
Crashworthiness is one of the most important aspect which is taken into account in road design. The effectiveness of Finite Element Method (FEM) to solve major design problems and as a tool to perform parametric studies, has been plainly demonstrated in literature. Of course this is possible only when available models of vehicles and devices are calibrated in a wide range of impact conditions. This research, was intended to develop a well ...
DOE SENSITIVITY ANALYSIS WITH LS-OPT AND VISUAL EXPLORATION OF DESIGN SPACE USING D-SPEX
Katharina Witowski, Heiner Muellerschoen, Marko Thiele - DYNAmore GmbH
Uwe Gerlinger - AUDI AG
This paper describes the approach of a DOE (Design of Experiments) sensitivity analysis using LS-OPT in conjunction with AURA for simulating the radiation of a diesel particle filter. The process flow from preprocessing to the visual evaluation of the results using the D-SPEX (Design SPace EXplorer) software is presented. For the purpose of this sensitivity analysis the geometrical arrangement as well as polynomial curves from the AURA input had ...
Effects of Mesh Size and Remapping on the Predicted Crush Response of Hydroformed Tubes
Guillaume D'Amours, Ahmed Rahem - National Research Council of Canada
Robert Mayer - General Motors Technical Center
Bruce Williams - University of Waterloo
Michael Worswick - University of Waterloo
Crashworthiness simulations can be useful tools in vehicle design. According to Du Bois [1], there are many factors which affect the reliability of crashworthiness models. Especially, the mesh size and the mapping of forming results into crash models. Few studies have analyzed the mesh size effect with forming results on the crashworthiness of frame components. This paper presents an analysis of crush response of hydroformed aluminium tubes from ...
Enhancements in dummy model development and outlook
Jim Rasico, Fuchun Zhu, Robert Kant - First Technology Safety Systems, Inc.
It has been almost 11 years since FTSS introduced the Hybrid III 50th dummy finite element model in 1996. From their inception, Finite Element dummy models were constrained in size and accuracy by the computational resources and modeling capabilities of the time. In recent years, the numerical simulation and analysis industry has benefited from the advanced computing technology and finite element modeling techniques. Today the latest ...
Evaluation of rail height effects on the safety performance of W-Beam barriers
Dhafer Marzougui, Pradeep Mohan, Cing-Dao (Steve) Kan - The George Washington University, USA
Kenneth Opiela - US Department of Transportation, USA
The objective of this study is to investigate the effect of rail height on the safety performance of G4(1S) w-beam guardrail systems. The study involved three steps. In the first step, a detailed finite element model of the G4(1S) guardrail system was created. The model incorporated the details of the rail, connections, the post, the blockout, and the soil in which the post was embedded. To validate the model of the wbeam guardrail system, a ...
EVOLVING TECHNOLOGY: MULTI-PHASE, MULTIMATERIAL, ALE APPROACH AND TOOL DEVELOPMENT FOR BURIED BLAST SIMULATION
Dr. Rahul Gupta - U.S. Army Research Laboratory Aberdeen Proving Ground
Modeling the response of structures subjected to blast from shallow buried explosives poses a challenge, primarily due to the inherent coupled interaction. The response of the structure affects the surrounding blast pressure field, which in turn, affects the loading on the structure; therefore the problem is coupled in nature. The problem is complicated due to the difference in time scales associated with the blast loading and structural damage. ...
Experience from using recently implemented enhancements for Material 36 in LS-DYNA 971 performing a virtual tensile test
Michael Fleischer - BMW Group
Thomas Borrvall - Engineering Research Nordic AB
Kai-Uwe Bletzinger - Technische Universität München
In today’s automotive industry the development of car bodies considerably depends on the use of computer-aided tools to meet the challenges of rising product complexity and growing number of variants. Today, enabled by modern simulation software, improved material models and numerical methods, simulation has become essential for the evaluation of sheet-metalstamping processes before press tools are manufactured. Though modern material models are ...
Fan Blade Bird Strike Analysis Using Lagrangian, SPH and ALE Approaches
Alexander A. Ryabov, Vladimir I. Romanov, Sergey S. Kukanov - Sarov Engineering Center
Yuriy N. Shmotin, Pavel V. Chupin - NPO Saturn
Fan blade bird resistance is one of the most important certification requirements for modern jet engines. The development test to meet the requirement is difficult and costly experiment. The expenses can be significantly reduced by using the numerical simulation of fan blade bird strike problem in the design of jet engine. The common technique for such simulations is modeling of bird as a solid cylinder or ellipsoid with material properties ...
FE-MODELING OF SPOTWELDS AND ADHESIVE JOINING FOR CRASHWORTHINESS ANALYSIS
A. Haufe , G. Pietsch - Dynamore GmbH, Germany
M. Feucht, S. Kolling - DaimlerChrysler AG, Germany
The increasing demands with regard to the predictive capabilities and the exactness of crash simulations require more and more investigations into numerical models in order to capture the physical behavior reliably. Steps towards this goal are the usage of finer meshes which allow for a better geometrical representation and more sophisticated material models which allow better prediction of failure scenarios. Another important playground ...
Next 30 items » [1] 2 3 4