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10th European LS-DYNA Conference

Würzburg, 2015

Solving of Crash Problems of the Fuel Supply Modules in the Fuel Tank
M. Dobeš, J. Navratil (Robert Bosch)
This article in the first part deals with the experimental measurement of the material data used for explicit computational FEM analyses. The second part of this paper devotes practical application of the FEM simulation in fuel tank domain and fuel supply modules (FSM). The main focus is on the material computational models, especially material models with strain rate dependence. These computational models are used for polymer materials, like ...
Speeding up the Pedestrian Protection CAE Process
G. Newlands, C. Archer (Arup)
Pedestrian protection is increasingly important to the design and development of the front end of vehicles. The various protocols, impactors and methods relating to pedestrian protection mean that the CAE process can be complex and time consuming. Arup has developed various tools to aid in this process which are used internally within Arup when working on automotive consultancy projects as well as being available externally in the Oasys LS-DYNA® ...
SPH Modeling of Cutting Forces while Turning of Ti6Al4V Alloy
A. A. Olleak, H. El-Hofy (Egypt-Japan University of Science and Technology)
A growing interest in modelling and simulation of machining processes has been witnessed in the past few decades. Smoothed particles hydrodynamics (SPH), one of the latest and developing methods used for that purpose, is a powerful technique that can be efficient in handling problems in which large deformation occurs. This technique is able to overcome the shortcomings of the traditional finite element methods. One of these shortcomings is the ...
Stability of THUMS Pedestrian Model and its Initial Trauma Response Against a Real-Life Accident
L. Wen, C. Bastien, M. Blundell, C. Neal-Surgess (Coventry University)
K. Kayvantash (CADLM)
With dramatically rapid development of computing and modelling technology, occupant and pedestrian safety models went through the development of crash test dummies and multi-body mathematical dynamic modelling to finite element pedestrian human model (THUMS 4.0). THUMS 4.0 is a state of art human model which includes a skeleton structure, as well as internal organs and soft tissues, which makes it a suitable candidate to analyse accident trauma.
Statistical Energy Acoustic for High Frequencies Analysis
M. Souli, R. Messahel (University Lille)
Y. T. Zeguer (Jaguar Land Rover)
Y. Huang (LSTC)
For high frequency analysis, Statistical energy analysis (SEA) has proved to be a promising approach to the calculation of sound transmission in complex structures. In automotive industry and also in civil engineering, most of noise transmission is due to high-frequency structural vibrations, where the characteristic wavelength is small compared to the dimensions of the structure.
Stochastic Simulations for Crash Worthiness and Occupant Protection
T. Yasuki (Toyota Motor)
Reduction of mass of vehicle is a high priority of design targets in automotive industries. To achieve the design targets, several quality control methods are employed in crashworthiness and occupant simulations by LS-DYNA at Toyota Motor Corporation. Some topics using quality control methods in the simulations including LS-TASC are introduced, and its effectiveness and limitations are discussed.
Strain-Rate Dependant Damage Material Model for Layered Fabric Composites with Delamination Prediction for Impact Simulations
S. Treutenaere, F. Lauro, B. Bennani (University of Valenciennes and Hainaut Cambrésis)
T. Matsumoto, E. Mottola (Toyota Motor Europe)
The use of carbon fabric reinforced polymers (CFRP) in the automotive industry increased very significantly due to their high specific stiffness and strength, their great energy absorption as well as the reduced manufacturing cost. The behaviour understanding and modelling of these materials become essential for their implementation into the design loop, needed for the deployment on mass-produced vehicles. In order to ensure the protection of ...
Structural Analysis of an Automotive Forming Tool for Large Presses Using LS-DYNA
K. Swidergal , Prof. M. Wagner (OTH Regens­burg)
C. Lubeseder, I. von Wurmb, J. Meinhardt (BMW Group)
S. Marburg (University of the Federal Armed Forces)
To improve efficiency in automotive press shops, press systems with increasingly high stroke rates are being implemented, raising thereby the structural dynamic load on the press and especially on the forming tool. A detailed knowledge of the vibrations and resulting critical loads is thus essential for accurate and reliable designs of forming tools. In this paper, dynamic finite element method (FEM) simulation of a selected automotive tool is ...
Textile and Composite Modeling on a Near Micro-Scale: Possibilities and Benefits
O. Döbrich, T. Gereke, C. Cherif (Technical University Dresden)
Textile materials are increasingly used in civil engineering for the purpose of reinforcing high performance composites, acting as membranes or fulfil technical tasks like filter contaminated media. Therefore, the demand for accurate numerical models which are able to predict the textile mechanics and the forming behaviour of dry and consolidated textiles is increasing and the requirements on the models accuracy and fineness rises. Many ...
The CASIMIR Model for Simulation in Seating Comfort Applications – A Status Update for LS-DYNA
N. Lazarov, D. Fressmann (DYNAmore)
A. Siefert (Wölfel Beratende Ingenieure)
For those who spend a lot of ti me driving, issues of comfort can become issues of health and safety. Therefore seating comfort is an important point in the seat development. Currently, the OEM and Tier - 1 are mainly using experimental setups with test drivers for the evaluation of seating comfort.
The Effects of Active Muscle Contrac­tion into Pedestrian Kinematics and Injury During Vehicle-Pedestrian Collision
I. Putra, J. Carmai, S. Koetniyom (King Mongkut’s University of North Bangkok)
B. Markert (RWTH Aachen/University of Agder)
The objective of this study is to develop a finite element model of active human skeletal muscle, which can mimic the contraction behavior of the skeletal muscle and also to analyze the effects of active muscle contraction into pedestrian kinematics and pedestrian injuries during vehicle-pedestrian collision. The skeletal muscles are modeled by combination of solid tetrahedral elements and line beam elements.
The Influence of Johnson-Cook Parameters on SPH modeling of Orthogonal Cutting of AISI 316L
A. A. Olleak, H. El-Hofy (Egypt-Japan University of Science and Technology)
M. N. A. Nasr (Alexandria University)
Over the past few decades, there has been a growing interest in modelling of machining processes. In this regard, smoothed particle hydrodynamics (SPH) is one of the latest methods used for that purpose. SPH is a powerful technique that can be used in handling problems of large deformation that are difficult to be tackled using traditional finite element methods. The current work aims to present and evaluate the use of SPH in modelling the ...
The Numerical Failure Prediction by the Damage Model GISSMO in Various Materials of Sheet Metal
S. Chinzei, J. Naito (KOBE Steel)
Responding to continuous demands for weight saving and enhancement of collision safety of vehicles, high-strength steel sheets are widely used for car bodies. Also, the applications of aluminum sheets are increasing for seeking more lightweight, recently. In applying sheet metals with thinner thickness and higher strength to car bodies, numerical fracture predictions are strongly required to ensure collision safety, since the reduction of ...
Three-Point Bending Crack Propagation Analysis of Beam Subjected to Eccentric Impact Loading by X-FEM
T. Tsuda, Y. Ohnishi, R. Ohtagaki (Itochu Techno-Solutions)
K. Cho, T. Fujimoto (Kobe University)
When analyzing a failure or crack propagation problem by FEM, there are the following challenges to solve. (1)It’s necessary to make element boundary match to the failure surface or the crack surface. (2)The failure shape and the crack propagation direction depend on the mesh. (3)It’s necessary to express a singularity of crack tip field.
Topology Optimization of Transient Nonlinear Structures – A Comparative Assessment of Methods
E. J. Wehrle, F. Duddeck (Technical University Munich)
Y. H. Han (Hyundai Motor Group)
Topology optimization considering transient nonlinear behavior of mechanical structures, e.g. automotive crash, remains a challenge in both the implementation as well as computational effort. In recent years, efficient optimization algorithms and increased computer technology has begun to allow the development of methodologies to examine optimal topology of structures undergoing such behavior.
Topometry and Shape Optimization of a Hood
Y. H. Han (Hyundai Motor Group)
K. Witowski, N. Lazarov, K. Anakiev (DYNAmore)
 
Towards Location Specific Statistical Fracture Prediction in High Pressure Die Castings
R. Watson, W. Griffiths (Univerity of Birmingham)
T. Zeguer (Jaguar Land Rover); S. Ruffle (JVM Castings)
High pressure die casting is an economical means of producing a high volume of aluminium parts, with a design freedom that can enable lighter structures to be envisioned, compared with wrought assemblies. However, cast aluminium parts have been shown to be vulnerable to damage by defects caused by the entrainment of air during the casting process. A recently developed entrainment prediction algorithm, which is believed to more quantitatively ...
Usage of LS-DYNA in Metal Forming
M. Fleischer, A. Lipp, J. Meinhardt, P. Hippchen, I. Heinle, A. Ickes, T. Senner (BMW Group)
 
Use of Forming Limit Curve as a Failure Criterion in Maritime Crash Analysis
B. Atli-Veltin, L. Vredeveldt (TNO)
The crashworthiness of marine structures is one of the main area of interest of several parties active in maritime area. The ability of structural material to absorb mechanical energy without fracture, is a very important safety feature. For offshore structures, the general approach towards a fracture criterion is based on the Norsok standards. For inland waterways, it is based on ADN Guidelines.
Using JFOLD & LS-DYNA to Study the Effects of Folding on Airbag Deployment
R. Taylor (Arup), S. Hayashi (JSOL)
Today's engineers and designers need accurately folded airbags in their deployment simulations. Minor changes in the way the airbag is folded can cause different deployment behaviour, which can lead to trim fracture, hang-ups and unintended injury. There is a growing demand for robust, accurate analysis to study and mitigate these problems, but creating an accurate model of a folded airbag is still a challenge. JFOLD is a software tool developed ...
Using LoCo for Multi Run Simulations
R. Luijkx (AUDI)
M.Thiele (SCALE)
For several years now AUDI and DYNAmore (now SCALE) have been working on a new generation of SDM-System called LoadcaseComposer, Short: LoCo. This SDM-System applies several new approaches to Simulation Data Management, such as strict offline capabilities with permanent synchronization of relevant data, consequent and strict version management of all related objects of simulations, novel ontology based approaches for the assembly of components ...
Validation of Fluid Analysis Capabilities in LS-DYNA Based on Experimental Result
S. Tokura (Tokura Simulation Research)
The latest LS-DYNA provides several excellent capabilities for modeling of fluid like materials. These capabilities contains ALE, SPH and CESE for compressible fluid and ICFD for incompressible fluid. Each capability has its own numerical method for computation and characteristics, and is used properly for different target of modeling and purpose of each simulation. For example, ALE and SPH can treat free surface problem automatically without ...
Verification of the Part-Composite Approach for Modeling the Multi-Layered Structure of a Rolling Truck Tire
S. Shokouhfar, S. Rakheja (Concordia University)
Accurate modeling of a truck tire for predicting dynamic characteristics requires an adequate representa- tion of its composite plies. This study compares two approaches in modeling the multi-layered structure of a rolling radial-ply truck tire using LS-DYNA. In the first approach, different layers in the tire structure are modeled using individual elements; whereas, in the second, all layers are represented by a single element with layered ...
Virtual Vehicle Company Overview.pdf
 
Volume-Averaged Stress States for Idealized Granular Materials using Un­bonded Discrete Spheres in LS-DYNA
M. T. Davidson, J. H. Chung, V. Le (Bridge Software Institute)
H. Teng, Z. Han (LSTC)
 
X760 Bumper Automation and Optimization Process
T. Zeguer (Jaguar Land Rover)
Currently the bumper system is developed through a wide variety of individual virtual test methods, the majority of which also have to be verified with physical testing. This paper will describe a new process that produced a one combined virtual process to encompass the full bumper as a system development method by creating One model for a bumper as one system with multiple attributes and requirements and using only one code “ LS-DYNA and ...