Program

Tuesday, 31 October, 10:15-11:15 [General Session]

[Keynote Speech]
Springback Prediction with Modified Yoshida-Uemori Model that Accounts for Transformation Induced Plasticity (TRIP)

Associate Prof. Fadi Abu-Farha
Automotive Engineering
Clemson University - International Center for Automotive Research

Transformation-induced plasticity (TRIP) steels possess improved strain hardening behavior and resistance to necking that are favorable for automotive body applications. However, the TRIP effect causes complex springback behavior of these steels that can hardly be predicted by existing constitutive models. In this work, the Yoshida-Uemori model describing isotropic and kinematic hardening is modified by adding new parameters that represent austenite-to-martensite transformation in TRIP steel. Cyclic tension/compression experiments were performed on a selected TRIP-steel grade, and the results were used to calibrate the modified model. The modified model was coded via user subroutine into a commercial FE solver. The springback predictions were compared with actual try-out stamping experimental results for highlighting the improvement of predictions with the modified model.

Tuesday, 31 October, 11:15-12:15 [General Session]

[General Session]
Recent and Ongoing Developments in LS-DYNA.

Dr.Jason Wang
Senior Software Engineer
Livermore Software Technology Corporation

Tuesday, 31 October, 13:30-14:00 [Multiphysics]

Study of Unsteady Aerodynamic Characteristics of a Car in Dynamic Motion using LS-DYNA

Dr. Yusuke Nakae
Assistant Manager
Advanced CAE Div. Advanced R&D and Engineering Company
TOYOTA Motor Corporation

Previous studies have revealed that the unsteady aerodynamic loads produced due to vehicle vertical motions affect vehicle dynamic performances and these loads have a correlation with the flow around the wheel house. However, the cooling-air flow passing through engine compartment which might affect the flow was not considered. This paper describes the numerical analysis of the unsteady aerodynamics of a car model with engine compartment to analyze more realistic flow fields. As a result of this analysis, the detailed mechanisms by which unsteady aerodynamic loads are caused during dynamic pitching motions were clarified. Furthermore, the effects of mounting aerodynamic devices which were developed based on the analysis were also discussed.

Tuesday, 31 October, 14:05-14:35 [Multiphysics]

Shape Optimization by Flow Simulation of Resin Pellets

Dr. Liu Jihong
Team Leader
Technology and Innovation Center
DAIKIN INDUSTRIES, LTD.

In this paper, we utilized a simulation approach based on the dynamic explicit finite element method to evaluate the flowability of strand cut pellets in hopper. We clarified that the shape of fluorine resin strand cut pellets had a large influence on its flowability, and found an optimal pellet shape that can improve the flowability of the fluorine resin strand cut pellets.

Tuesday, 31 October, 14:40-15:10 [Multiphysics]

Study on the Electromagnetic Flux Generation method using Axisymmetric Electromagnetism Solver

Mr. Kunio Takekoshi
Engineering Division
Terrabyte Co., Ltd.

The electromagnetism solver in LS-DYNA is a novel solver which can be coupled with the non-linear structural solver in LS-DYNA. However, The EM-3D (three dimensional) solver requires calculation costs due to the boundary element method for the simulation of magnetic field in the air. On the contrary, analysis targets of the EM solver such as solenoid coils have rotational symmetry, thus, the calculation costs can be reduced with an EM-2D axisymmetric solver for the simulation of such targets. In this presentation, a result will be shown where the electromagnetic flux generation method is successfully simulated using a newly implemented EM-2D solver in LS-DYNA, and also some modeling techniques/topics will be provided for the EM-2D solver.

Tuesday, 31 October, 13:30-14:00 [Manufacturing1]

Study for improvement of simulation accuracy

Mr. Naohisa Adachi
Stamping Die Engineering Section
Nissan Motor Co., Ltd.

Aluminum material application for automobile press parts is expanding due to the need to improve fuel economy and lightweight performance. Since the amount of spring back of aluminum material is larger than that of mild steel, it is necessary to develop spring back prediction technology of high precision aluminum parts by forming simulation. I focused on material model with HOOD OTR as the theme and tackled improvement of accuracy this time, report the result.

Tuesday, 31 October, 14:05-14:35 [Manufacturing1]

JSTAMP Application for press forming of Aluminum/Cupper parts.

Mr. Kenji Yasui
President
Hakkou Giken

Tuesday, 31 October, 14:40-15:10 [Manufacturing1]

TBA

Mr. So Suzuki
Deputy Manager
R&D Division Engineering Operations
G-TEKT CORPORATION

Tuesday, 31 October, 13:30-14:00 [Structural Strength]

Study on the modelling of material erosion using solid to SPH/DEM transformation.

Mr. Yasushi Hondo
Engineering Division
Terrabyte Co., Ltd.

Element erosion technique is widely used to predict penetration and perforation in impact simulations. However, the element erosion has a problem of loss of mass, and therefore, reduction in kinetic and strain energies during the simulation because once an element reaches to its failure criteria, that element is removed from further calculations. Recently, transform method of failed solid element to SPH or DEM has been implemented in LS-DYNA for conservation of the mass and the energies. In this study, impact simulation of reinforced concrete walls based on experimental results by Sugano et al., are carried out using the above transform method, and comparisons of simulation and experimental results are discussed.

Tuesday, 31 October, 14:05-14:35 [Structural Strength]

FEM analysis of Window Glass Fragment into Pieces and their Scattering due to Collision of Flying Object

Associate Prof. Yoichi Mukai
Graduate School of Engineering
Kobe University

Window glass destruction due to impact objects can cause serious human injury, thus to consider of window glass property placed on a building facade is important for shock-resistant building design against impact actions. In this study, destruction moment of glass windows due to flying objects is observed with high-speed video camera through the impact loading experiments, and behavior of scattering glass window pieces is quantitatively estimated. Test specimen and test situation are simulated by FEM analyses using solid elements for window glass. As a results, it is assured that numerical simulations can adequately reproduce window glass behavior broken into pieces and their scattering as recording in the experimental tests.

Tuesday, 31 October, 14:40-15:10 [Structural Strength]

Current Status of the Tornado-generated Missile Protection for Structures of Nuclear Power Plants

Dr. Koji Shirai
Associate Vice President
Nuclear Risk Research Center (NRRC)
Central Research Institute of Electric Power Industry (CRIEPI)

After the Great East Japan Earthquake, the competent authority has mentioned the effects of tornadoes on Nuclear Power Plants. Facilities with important safety functions shall be designed to maintain the safety function due to impact forces resulting from tornado missiles. During business licensing activities, although several impact design methodologies have been implemented, there is considerable variation among licensees when implementing these impact design methodologies due to complicated consideration related to material nonlinearities and local triaxiality effects on the response ductility limit. Hence, CRIEPI proposed the methodology to achieve accurate results for impact design subjected to tornado missiles.

Tuesday, 31 October, 15:40-16:10 [Automotive1]

Development status of THOR dummy model for frontal crash test.

Mr. Motoki Kobayashi
CAE Manager
CAE Division
HUMANETICS INNOVATIVE SOLUTIONS JAPAN INC.

Finite Element ('FE') models of Anthropomorphic Test Device ('ATD'), commonly known as crash test dummies, are widely used in a variety of areas such as automotive crashworthiness, passenger safety and automotive environment related applications. The cost effectiveness of computational power and detailed FE models of ATDs have become more realistic in recent years. Demand has been growing due to the inherent benefits of reduced cost and time in the product development cycle of FE models. The presentation will focus on the latest development situation of <THOR-5th> and <THOR-50th> dummy models.

Tuesday, 31 October, 16:15-16:45 [Automotive1]

Validation Tests and Simulations for Laminated Safety Glass

Dr.-Ing. Martin Sauer
Group Leader Materials at Highest Strain Rates,Deputy Department Leader
Materials and Simulation Methods
Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut (EMI)

We present new subsystem validation test setups for laminated windscreen glass and corresponding simulation results. As the tests were performed both quasistatically and dynamically, they give insight into the cracking behavior of the laminated glass, the resisting forces and the influence of dynamic loading conditions. Within the CompMethGlass project, a new user material subroutine for glass for LS-DYNA was developed. The model uses thick shell elements and a smeared crack approach to represent failure. We will show both qualitative and quantitative comparisons of simulation results with experimental observations.

Tuesday, 31 October, 16:50-17:20 [Automotive1]

Study of occupant lower leg injury value using interface new function

Mr. Takashi Ishihara
Department 2, Technology Development Division 12
Honda R&D Co.,Ltd

The objective of this study is to develop the new function that can easily change the deformation of the car body at the occupant crash safety CAE, and to verify its influence on the lower leg injury value which might be particularly affected by the deformation of the car body. In the new function we developed with LSTC and JSOL, the amount of the body deformation which come from the car body crash CAE can be easily scaled and reflected on the occupant crash safty CAE. This function is named *Interface_local and will be released in the future version of LS-DYNA. This presentation reports the results that is verified by the occupant crash safety model of full frontal crash in the front seat passenger side AM50% dummy by using the implemented LS-DYNA new function as an example.

Tuesday, 31 October, 15:40-16:10 [Manufacturing2]

Activity of body dimensions precision control technology with press-molding simulations.

Mr. Daiki Takahashi
Assistant Manager
Stamping Engineering Gr
Mazda Motor Corporation

In order to realize light weight and high strength body structure, we are always challenging more innovative engineering development of the High Tensile Strength Steel. It is difficult to form the shape and to control quality. The High Tensile Strength Steel utilization ratio become increasing, and it is predicted to control the vehicle dimensions become difficult more. Therefore I connected the body assembly domain from press parts in CAE and developed the dimensional control technique to perform mass production preparations efficiently in the virtual and real.

Tuesday, 31 October, 16:15-16:45 [Manufacturing2]

Press forming simulation and press machine

Mr. Takunori Kyuno
Engineering Department
ADD.Q

Tuesday, 31 October, 16:50-17:20 [Manufacturing2]

Advances of Metal Forming Simulation Technology with New Horizons

Prof. Mansoo Joun
Mechanical Engineering
Gyeongsang National University(GNU), KOREA

In this presentation, advances of metal forming technology for industrial applications as well as research activities are summarized, based on AFDEX, a general-purpose metal forming simulator. Demand change of consumers of metal formed products are discussed and some activities to meet with them are introduced with emphasis on complete macroscopic analyses and metallurgical predictions including heat treatment and microstructural evolution. A quantitative measure to evaluate grain flow is presented, which is of great importance for process design optimization. The direction of advances in metal forming simulation technology in the near future is also given.

Tuesday, 31 October, 15:40-16:10 [Convergence Engineering]

Direct simulation of resistivity on porous model obtained from high-resolution X-ray

Dr. Hidetaka Saomoto
Senior Researcher
Research Institute of Earthquake and Volcano Geology
National institute of Advanced Industrial Science and Technology

Resistivity imaging of underground is widely used to infer the behavior of groundwater flow and to comprehend the changes of ground state caused by ground improvement. In order to increase the accuracy in the estimation of geological properties derived from resistivity imaging, we need to reveal the relationship between the resistivity and several physical parameters such as porosity, degree of saturation, and electrical conductivity of pore fluid. We have conducted a series of finite element simulations with above parameters to directly determine resistivity of porous media with the detailed three-dimensional porous models obtained from the high-resolution X-ray CT. Subsequently, the simulation results are compared with those obtained from experiments and with those derived from an empirical law, i.e., Archie's equation. According to the comparison, the simulation results are in good agreements with experimental results and indicate similar function form that proposed in the empirical equation being available for unsaturated state. Finally, we discuss the limitation of the empirical equation and infer that the empirical equation is applicable to geo-materials having a degree of saturation exceeding 40%.

Tuesday, 31 October, 16:15-16:45 [Convergence Engineering]

A Study of Micro-structure and Mechanical Properties of the Porous Polymer using FIB/SEM Tomography and the Finite Element Method

Ph.D Hajime Matsumoto
Yokohama R&D Center
Mitsubishi Chemical Corporation

We had achieved the 3D micro-structure of porous polymer was reconstructed based on the as-recorded stacks of FIB/SEM images, and then the mechanical properties were calculated by finite element modelling (FEM) using the reconstructed 3D model. The mechanical properties from the numerical simulation based on the reconstructed 3D model show a good agreement with those observed by experiments. As a result, a combined FIB/SEM tomography and FEM study could help to in-depth understand microstructural features of porous polymer by taking into account mechanical performance.

Tuesday, 31 October, 16:50-17:20 [Convergence Engineering]

The analysis of electric resistance and thermal resistance on metal interface in electrically conductive adhesive

Mr. Osamu Arao
Project Manager
Material Engneering Div. Global Management Dept.
DENSO Corporation

For conductive adhesives, electricity and heat are conducted via metal filler. The study into the conductive mechanism has not advanced much and the reliability verification has been insufficient because there have not been accurate 3D observation techniques of conductive pathways. However, we observed the 3D conduction pathways by FIB-SEM, by repeated polishing and observation. Based on the observation results, material properties were considered. Regarding electrical conductivity, the average filler contact resistance was quantified from the number of contact points. Regarding thermal conductivity, the average filler interface resistance was quantified from thermal FEM analysis of the interface resistance model.

Wednesday, 1 November, 09:30-10:10 [Technical A]

Selection and setting of fluid analysis of LS-DYNA

Mr. Kei Morita
JSOL Corporation

The fluid-structure coupling analysis using ALE or SPH method has always been implemented to LS-DYNA. Recently, InCompressible Fluid Dynamics (ICFD) analysis and Discrete Element Method (DEM) have been introduced and the application range of the fluid-structure coupled analysis has been expanded. The increased options for the fluid analysis methods make it difficult to choose the right and the most appropriate method for the phenomena to simulate and for the evaluation and purposes for that simulation. In this lecture, we will take some typical phenomena as examples and introduce the know-how for selecting the appropriate analysis method and defining the input. The comparison between the simulation results of each method will also be presented for reference.

Wednesday, 1 November, 10:15-10:55 [Technical A]

Progress on speedup of tool cooling simulation for hot forming technique

Dr. Takeshi Kuroiwa
JSOL Corporation

The hot press technique is known as a technique that can produce and form high-strength steel panel. JSOL has been working on this issue to develop a manufacturing CAE solution to the technique. Some new speed up items to the tool cooling simulation within fluid dynamics function called ICFD in LS-DYNA will be presented. Not only ICFD itself but also fluid-structure interaction feature have been upgraded by recent development in LS-DYNA and application to simulation of multiphysics phenomena in industry is now becoming more and more realizable. General information needed to estimate realizability of fluid-structure interaction simulation within LS-DYNA will be also provided.

Wednesday, 1 November, 11:00-11:40 [Technical A]

Internal short circuit simulation of battery cells by LS-DYNA

Mr. Hiromichi Ohira
JSOL Corporation

Li-ion battery is known as its high capacity and light weight, and used widely such as mobile phones, laptop PCs, EVs. However, it causes fire explosion due to its high energy density in the worst cases when short circuits occurred. An internal short circuit is one of the important short circuits to be considered under the loading conditions. This type of test is difficult to examine frequently because it needs enough safety equipment, and thus prediction by the simulation would have great advantages. LS-DYNA can simulate the deformation of battery by a conventional FEM structural analysis, and current and heat distribution of inside the battery by Electromagnetic and Thermal analysis by single analysis. A distributed Randle circuit model, which simplifies the battery model as circuits, is implemented to simulate the battery cells. This session will introduce the outline of this feature and how-tos to define input decks using an example, and the possibility of the simulation to predict the battery internal circuits.

Wednesday, 1 November, 09:30-10:10 [Technical B]

Methods of how to model failure and crack propagation in LS-DYNA

Mr. Shingo Kitakaze
JSOL Corporation

The easiest way to create the new surface caused by material failure is element deletion, which has been applied in order to model the changes of the characteristics and the loading path of the structure. Recently, several methods which can accurately predict the propagation have been proposed. While these methods such as XFEM, SPG, Peridynamics have also been implemented in LS-DYNA, it is important for users to understand which method is appropriate and should be selected, depending on the material and the shape of the structure. In this lecture, we will introduce the new feature in LS-DYNA and the application for the failure propagation.

Wednesday, 1 November, 10:15-10:55 [Technical B]

Modeling of Adhesive behavior in LS-DYNA

Mr. Shingo Yagishita
JSOL Corporation

In recent years, new materials, such as aluminum and plastics, have increasingly applied to vehicle body structure in order to meet light weight design instead of iron. To bond these different materials, use of adhesives also has increased. In this session, we will introduce the outline of adhesive erosion using material and contact modeling with examples.

Wednesday, 1 November, 11:00-11:40 [Technical B]

Robust design approach with DIFFCRASH

Dr. Masahiro Okamura
JSOL Corporation

In recent years, light weight design has been required especially in automotive industry in order to meet strict safety and fuel emission standards as well as other features such as riding comfort and maneuverability. In order to achieve it, importance of robust design which minimizes the influence from scatters from production phase and operation condition is increasing. DIFFCRASH, developed by SIDACT GmbH in Germany, is a software which visualizes triggers of scatter in physical behaviors by statistical analysis of multiple animation files from LS-DYNA. In this session, fulctionalities of DIFFCRASH for robustness analysis are introduced with examples.

Wednesday, 1 November, 12:40-13:10 [Automotive2]

Study on prediction model of CFRP parts

Mr. Tsuyoshi Nishihara
Crash Safety Development Dept.
Mazda Motor Corporation

There is a strong need for automobile development compatible with high level of crashworthiness and vehicle dynamics, fuel efficiency. Multi-Material body with using CFRP has attracted a lot of attention. However, it is difficult to predict the CFRP property of bending and crushing due to their complex behavior. The prediction method for bending and crushing included interlaminar delamination using by MAT262 and CZM has been studied.

Wednesday, 1 November, 13:15-13:45 [Automotive2]

Fracture prediction in crashworthy steel auto bodies

Mr. Takahiro Aito
Senior Researcher
Application Technology Research Lab.
Nippon Steel & Sumitomo Metal Corporation

Application of high-strength steel sheet is increasing for achieving both collision safety improvement and weight reduction, in the steel auto body development. For exact collision simulation of the steel auto body, after grasping the material properties of high-strength steel sheet, it is important to predict spot weld fracture and steel sheet fracture accurately. The fracture prediction method based on experiments and theories was newly developed and the fracture prediction accuracy was verified using part models.

Wednesday, 1 November, 13:50-14:20 [Automotive2]

Draping simulation trial of carbon fiber cloth

Mr. Hiromitsu Asai
Chief
CAE dept. Seat Evaluation & Engineering div.
Toyota Boshoku Corporation

Wednesday, 1 November, 14:25-14:55 [Automotive2]

A Study of Optimal Design Method for Next Generation Vehicle Development using CAE Cloud

Mr. Shuta Mawatari
Engineering Systems Department
Mazda Motor Corporation

Mr. Hiromasa Kemmotsu
Technical Research Center
Mazda Motor Corporation

Virtual development using Computer Aided Engineering (CAE) contributes to quality improvement and save development period in vehicle development. Therefore, the on-premise supercomputer is increasing year by year. However, there is a problem in in dealing with an unexpected problems in vehicle development. So, we had used CAE Cloud for study of design method of next generation vehicle since last year. As the result we report the achievement, the findings and challenges gained in the study.

Wednesday, 1 November, 12:40-13:10 [THUMS]

Development of Child Finite Element Models and an Application to Car to Child Pedestrian simulation

Mr. Shigeki Hayashi
Group Manager
Advanced CAE Division
Toyota Motor Corporation

Total Human Model for Safety (THUMS) Version 4 child models have been developed that simulate the detailed anatomical structures of 3-year old, 6 year old, 10 year-old. The geometries of the skeleton, brain, and internal organs were precisely represented based on computed tomography (CT) scan image data of actual pediatric subjects. The material properties of body components were defined for each model considering the age. The completed child models were validated with the result of tests performed using PMHS and volunteers. Developed THUMS child models were applied to vehicle-to-pedestrian collision simulations. The result indicated that the developed THUMS child models are useful to analyze kinematics and injury mechanisms.

Wednesday, 1 November, 13:15-13:45 [THUMS]

New Release of THUMS Version 5 and 6 Occupant Models with Muscle Controller

Dr. Masami Iwamoto
Program Manager
Human Science Research-Domain, Cranial Nervous System Modeling Program
Toyota Central R&D Labs., Inc.

Toyota Central R&D Labs., Inc.(TCRDL) and Toyota Moter Corporation (TMC) will newly release THUMS (Total HUman Model for Safety) version 5 and 6 occupant models containing multiple muslces and their controller in 2017 and 2018, respectively. The occupant models include three body sizes of AM50(Adult Male 50%ile), AF05(Adult Female 5%ile), and AM95(Adult Male 95%ile).In new release of THUMS version 5 and 6, modeling of each muscle path is modified using LS-DYNA Keyword "PART_AVERAGED", and muscle activation of each muscle can be predicted using "DEFINE_CURVE_FUNCTION/PIDCTL option. The method to use the muscle controller and application examples using new release version of THUMS Version 5 and 6 occupant models will be presented.

Wednesday, 1 November, 13:50-14:20 [THUMS]

Human Body Model Utilization in Autoliv for Real-Life Safety Evaluation

Mr. Hiroyuki Saito
R&D Departement
Autoliv Japan Ltd.

Autoliv has been be engaged on the research and development of the car safety devices for many years with our vision of saving more lives and with our mission to be leading supplier of safety systems for the future cars. For the sake of the real-life safety, we have been also focusing on the biomechanical research and its application for the safety device performance evaluation by using human body model based on THUMS model. This presentation will introduce from our recent case studies of i) Evaluation of chest injury reduction with modern seat-belt restraint system and ii) Integrated safety evaluation by using human body model with active muscle function.

Wednesday, 1 November, 14:25-14:55 [THUMS]

Development of the Pregnant Occupant model using the THUMS

Dr. Toshiaki Sakurai
Associate Professor
Department of Mechanical Engineering, Faculty of Engineering
Tokyo City University

The placental abruption is the trauma of main cause of the fetal death during car accidents that pregnant occupants encountered. However, its injury mechanism has not been fully explained. In this study, a finite element model of a pregnant occupant of 30 gestational weeks was developed based on the Total HUman Model for Safety (THUMS). The geometry of uterus was determined by computer tomography (CT) images. To reproduce the pregnant abdomen shape, an airbag was inflated in the abdomen to obtain realistic deformation. Consequently, abdominal contour was compared with volunteers' measurement and abdominal response was compared with results of post mortem human subject (PMHS) experiments.

Wednesday, 1 November, 12:40-13:10 [New Field]

Progress and Future Prospect for Application of LS-DYNA on Origami Engineering

Dr. Sunao Tokura
HQ
Tokura Simulation Research

The aim of origami engineering is the application of the traditional art and features of origami for engineering problem The study to reveal the strength and other important characteristics of the origami structures based on the concept of origami engineering by means of experiments and simulation is continuously in progress. It has been clearly recognized that flexible and various capabilities in LS-DYNA is considerably useful to simulate the behavior of the origami structure with large deformation in the study. Current status for manufacturing procedures, characteristics of origami structures and application of LS-DYNA in the study on origami engineering are introduced in this presentation.

Wednesday, 1 November, 13:15-13:45 [New Field]

Numerical simulation of damped vibration and sound by applying LS-DYNA

Prof. Takao Yamaguchi
Faculty of Science and Technology
Gunma University

By applying LS-DYNA, vibration analysis was carried out for beams or plates laminated on viscoelastic damping materials. Using FEM, eigen frequencies, eigen modes and strain energy are computed. From the strain energy, values of modal damping (i.e. modal loss factors) at resonances were calculated by Modal Strain Energy Method. We compared the numerical results with theoretical values from the Oberst equation. Further, acoustic analysis by BEM was also carried out for a small room including a wall. Soft materials (e.g. sound absorbing material) were set on the wall. Acoustic impedance of the walls were measured using an acoustic tube. The walls were defined as impedance boundaries. The calculated responses were compared with experimental ones.

Wednesday, 1 November, 13:50-14:20 [New Field]

Fabric Behavior Analysis with Arimatsu-Narumi Tie-dyeing Robot

Associate Prof. Kazunori Shinohara
School of Engineering
Daido University

To construct an automation system for tie-dyeing techniques, a tie-dyeing robot using Japanese traditional Arimatsu-Narumi tie-dyeing techniques was developed. The first problem to overcome was the breaking of fabric. In case of tie-dying with robots, when using a cylindrical needle, the fabric has to be pushed into the hollow cylindrical cap, after it has been set on it. When this happens, friction forces occur among the fabric, the needle and the cap. The friction forces cause tensile stress inside the fabric locally and transiently. The second problem to overcome was the tie-dyeing pattern. In this study, to clarify fabric mechanisms and how fabric behavior affects load factors, we analyzed fabrics using LS-DYNA.

Wednesday, 1 November, 14:25-14:55 [New Field]

Press-fitting and removing analysis of resin parts using 3D adaptive EFG

Mr. Yuho Hayashi
CAE Analysis Team Progress Planning Division
STARLITE Co., Ltd

To introduce a case study where the 3D adaptive EFG is used to analyze the prediction of the force required for press fitting and pulling out on a resin part which attached to a stud bolt welded to an automobile.

Wednesday, 1 November, 15:10-15:40 [General Session]

[Special Speech]
Modeling of a Cast Aluminum Wheel for Crash Applications

Dr.-Ing.Martin Sauer
Group Leader Materials at Highest Strain Rates,Deputy Department Leader
Materials and Simulation Methods
Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut (EMI)

Wheels may be subjected to severe loading in case of a vehicle crash and often play a predominant role in vehicle safety, especially in frontal load case such as the small overlap. Modeling of wheels for crash applications requires information concerning the material used for the component which is usually not communicated to customers other than OEMs. In the present study, a representative cast aluminum wheel of 16'' has been characterized and simulated through a reverse engineering process. Coupons were directly extracted from the wheel and allowed to characterize the material. Simulations were performed using LS-DYNA and the damage model GISSMO (Generalized Incremental Stress-State dependent damage Model). Eventually, the numerical model has been successfully validated thanks to a crash test performed at Fraunhofer EMI.

Wednesday, 1 November, 15:40-16:40 [General Session]

[Keynote Speech]
Prediction for Local Deformation Modes of Structural Members Using the Isogeometric Analysis and Fast Nurbs Generator

Mr. Kenji Takada
Chief Engineer
Department 2, Technology Development Division 9
Honda R&D Co.,Ltd. Automobile R&D Center

The current shell elements of FEM use bilinear shape functions which are difficult to predict a complicated local deformation with high accuracy. To resolve this problem, IsoGeometric analysis considered. First, to investigate the applicability of IsoGeometric analysis in crashworthiness, simplified models were utilized. They contain S-frame model for collapse problem, 3-point bending model for fracture, L-T model for spot weld failure and hat-section model for axial crash problem. These simulation results based on the IsoGeometric analysis correlated well with the experimental tests. Next, a fast Nurbs Generator to comprehensively transfer the data between CAD and IsoGeometric analysis was developed by the authors. In this presentation we will address the following three points: evaluation of the IsoGeometric analysis results against the experimental results, functionalities of Fast Nurbs Generator and its algorism, and the future challenges of IsoGeometric analysis.