Wednesday, July 24, 2013 9:40-10:25

[Keynote Speech]
Towards Including Virtual Testing Procedure into the Homologation Process - Experiences within the EU-Project IMVITER

Dr. Thomas Munz, DYNAmore GmbH

With the advancement of the numerical methods and their implementation into commercial software tools, the idea of including virtual testing procedures into the homologation process becomes increasingly attractive. In the collaborative project IMVITER, which was co-funded by the European Commission, this idea was investigated on a European level. The consortium included several European OEMs, suppliers, regulatory bodies and software houses. The main goal of IMVITER was to investigate the possibility of implementing virtual testing procedures into existing safety standards. This goal implies the consolidation of advanced virtual testing technologies. In detail, it requires that the accuracy of the simulation models and the virtual testing procedures can be assured and rated independently of the modeling process, software tools, computing platform and the performing organization. The project IMVITER addressed these aspects from various angles by investigating four so-called pilot load cases at various complexity levels. Additionally, the aspect of the inclusion of uncertainty aspects due to different experimental testing results and a cost benefit analysis for the different pilot cases were investigated. This presentation will summarize the main results of the project.

Wednesday, July 24, 2013 10:35-11:05 [MO-01 Automotive Session]

Numerical Simulation of Vehicle's Rollover Behavior by using LS-DYNA

Mr. Tatsuya Fukushima, NISSAN Motor Co., Ltd.

Accurately numerical simulation method of vehicle's rollover behavior was developed by using LS-DYNA. The method and results are presented for various initiation types of rollover.

Wednesday, July 24, 2013 11:45-12:15 [MO-03 Automotive Session]

Implementing advanced FE modeling in the newly updated Hybrid-III crash test dummy

Dr. Intaek Lee, Humanetics Innovative Solutions Japan

Humanetics follows the basic principles in mechanics from material to dummy system accompanying with various experimental ways. Based on the principles of mechanics, an advanced and sophisticated Hybrid III 50th and 5th dummy finite element (FE) model has been developed in LSdyna solver by Humanetics Innovative Solutions, Inc. The development is carried out from scratch by starting with the most up-to-date CAD package. The model geometry and inertia properties are obtained from available drawings and hardware. All the dummy components are meshed in a very detailed manner to accurately capture the mass and moment of inertia properties of the dummy. A variety of new material tests are conducted for rubber, foam and other deformable components to derive and implement the best suitable material models. A variety of contact, joint and sensors output features are modeled using the state-of-art features of LSdyna solver. The model is then validated against a variety of component, sub-assembly and sled loading conditions. The model can be found very reliable to predict dummy injury outputs and used to cost effectively iterate structural, safety systems and ergonomic design cycles for the vehicle developments.

Wednesday, July 24, 2013 11:45-12:15 [SO-03 Integrated solutions Session]

Comparison of internal fixations for distal clavicular fractures based on loading tests and finite element analyses

Ms. Rina Sakai, Kitasato University

It is difficult to apply strong internal fixation to fracture of the distal end of the clavicle because it is unstable, the distal bone fragment is small, and the fractured region is near the acromioclavicular joint. In this study, to identify a superior internal fixation method for unstable distal clavicular fracture, we compared three types of internal fixations (tension band wiring fixation, LCP clavicle hook plate, and Scorpion plate). Firstly, loading tests were performed, in which fixations were evaluated using bending stiffness and torsional stiffness as indices, followed by finite element analysis to evaluate fixability using the stress and strain as indices. The stability of fixation with the LCP clavicle hook plate and Scorpion plate was similar, and it was stronger than fixation by tension band wiring. Since each type of plate has advantages and disadvantages depending on their characteristics, it is important to select a plate complementing the condition of fracture.

Wednesday, July 24, 2013 11:10-11:40 [P1-02 Manufacturing Session 1]

Stamping simulation techniques for high strength steel sheets

Dr. Tohru Yoshida, Nippon Steel & Sumitomo Metal Corporation

The mechanism of springback behavior classified by the phenomenon and countermeasures based on each mechanism were reported. Torsion and camber of complicated shape parts were possible to decrease by planer stress control using the developed analytical methods of CAE. Another problem of high strength steel in forming process is edge fracture at stretch flange area. Edge fracture test for practical automotive body parts and new side bending test method were developed. From using these evaluation methods, we propose to design shapes for each high strength steel and prediction methods using CAE.

Wednesday, July 24, 2013 11:45-12:15 [P1-03 Manufacturing Session 1]

Technology of formability prediction in hot stamping simulation - Effect of deformation property and friction property in high temperature and for hot stamping formability -

Mr. Masahiro Nakata, Nippon Steel & Sumitomo Metal Corporation

Recently hot stamping technology has been widely applied to automotive production. As for its press formability, an advanced prediction technology is expected like in cold stamping as sometimes the temperature gradient within a sheet material caused by a thermal contact with a tool material derives the strain localization that progresses to the fracture. In this paper the simulation for hot hole expansion test with various forming conditions that include the strain localization behavior is carried out and the effects of the various material parameters and the heat transfer characteristic on the hot stamping formability is clarified. Moreover the notes while hot stamping simulation is describe.

Wednesday, July 24, 2013 13:30-14:00 [NT-01 New technologies Session]

Simulation and Innovation

Dr. Masataka Koishi, The Yokohama Rubber Co.,Ltd.

In the manufacturing industry, the main objective of simulation is improvement of product value. The design knowledge which improves product value can be acquired in the specified design problem by multi-objective design exploration which is based on simulation, evolutional computation and data mining. However, the true purpose of the design exploration is to reconstitute design problem, namely is to set good design problem that can create innovation. I would like to talk relation between simulation and innovation, and the directionality of the simulation that we should aim at in future.

Wednesday, July 24, 2013 14:05-14:35 [NT-02 New technologies Session ]

DIFFCRASH analysis of airbag scatter in crash simulation

Dipl.-Math. Clemens-August Thole, SIDACT GmbH

During crash simulation analysis it became evident from analysis the behavior of chest movement curves, that for this special example by Landrover there is a lot of scatter of simulation results. DIFFCRASH correlation analysis using mathematical procedures like singular value decomposition proved, that the source of scatter is in the interaction between the airbag and the dash board. After changing the contact parameters the simulation results were stable. The presentation will introduce the example, present the mathematics behind DIFFCRASH and show, how this problem could be tracked down to the airbag-dashvoard interaction.

Wednesday, July 24, 2013 13:30-14:00 [MA-01 Material Session]

Material Testing, Modeling and Validation Techniques for MAT_SAMP-1

Dr. Kunio Takekoshi, TERRABYTE Co., Ltd.

Constitutive material model called SAMP-1 is a highly complex model capable of considering stress - strain (SS) relationship for tension, compression, shear and biaxial-tension to simulate various deformations of polymer parts. To provide high quality SAMP-1 input data, TERRABYTE has studied its modeling methods for more than four years. We have successfully proposed a distinctively new method for determining Plastic Poisson's Ratio which plays significant role in simulating crazing behavior as well as established methods for calibrating the SS data. In this presentation, we will explain the advantages of our effective modeling techniques.

Wednesday, July 24, 2013 14:05-14:35 [MA-02 Material Session]

Evaluation of mechanical properties of weldline by cooperation with Moldex3D and DIGIMAT

Mr. Takato Nakayama, JSOL Corporation

There are some problems in an analysis of plastic components. One of them is evaluation of mechanical property in weldline parts. Especially, when we analyze fiber reinforced plastics, we should consider disorder of fiber orientation at weldline. Because it causes the stiffness to weaken. In this session, we aim to evaluate mechanical property of weldline by using Moldex3D and DIGIMAT. We need more effective method for applying LS-DYNA to plastic components. So we study how to fit both tensile and bending by regulating analytical parameter.

Wednesday, July 24, 2013 14:40-15:10 [MA-03 Material Session]

Experimental measurement and FE analysis of damage effects for rubber materials

Ms. Ai Kawasaki, Mechanical Design & Analysis Corporation

The Mullins effect is a particular aspect of the mechanical response in rubber materials in which the stress-strain curve depends on the maximum loading previously encountered. This paper introduces experimental measurements of the Mullins effect for natural rubber materials and its identification of material constants for FE analysis.

Wednesday, July 24, 2013 13:30-14:00 [P2-01 Manufacturing Session 2]

Efforts to mold cooling analysis in hot stamping

Mr. Kentaro Nakamura, Y-tec corporation

In order to both collision safety improvement and weight reduction for environmentally friendly ,high tension of automobile parts is progressing. production of high-strength parts in hot stamping is expanding. hardening by rapid cooling is necessary for securing the strength of hot-stamping parts. Temperature control and heat removal of the mold is important. For these predictions, analysis accuracy is desired. In this paper, using mold temperature data obtained from the hot stamping experiments were performed check consistency analysis using LS-DYNA.

Wednesday, July 24, 2013 14:40-15:10 [P2-03 Manufacturing Session 2]

Application of optical metrology for FEA

Mr. Yusuke Kawasaki, Marubeni Information Systems Co., Ltd.

Output of 3D optical measurement system is similar to the result from FEA. So these are used as a verification tool in recent years.

Wednesday, July 24, 2013 16:20-17:05 [JS-01 General Session 2]

CAE, The State-of-Arts and the Future - LS-DYNA / JSTAMP for the next step

Mr. Takahiko Miyachi, JSOL Corporation

JSOL has helped LS-DYNA and JSTAMP to be developed focusing to the market needs, and we are confident that we have been contributed a part of progress of CAE in the industries. However, we are still facing to new issues as new phenomena to be solved, request of efficiency for cost and time reduction, new role of CAE as reliability analysis based on statistics. In this talk, the upcoming plan of solutions as well as LS-DYNA and JSTAMP future development, will be introduced.

Thursday, October 30, 2014 11:20-11:50 [F-1 Modeling Session]

Opportunities for innovation in metal forming simulation through hierarchical multi-scale material modelling

Dr. Philip Eyckens, KU Leuven (University of Leuven)

The concept of multi-scale material modeling has proven to drive innovation in manufacturing, at least for certain materials such as fiber-reinforced composites. Including microstructural aspects in CAE design enables further optimization of part performance and reduction in development cost. For metal alloys however, multi-scale design solutions are currently not yet widely applied in industry.
his lecture discusses multi-scale material modelling research for metal forming with focus on industrial applicability. An overview is given of the state-of-the-art multi-scale modeling approach. The macroscopic anisotropy is captured by including relevant microstructural aspects such as crystallographic texture and crystal substructure.
Three examples of formable steel illustrate the performance of the multi-scale model:
(i) the prediction of yield locus without any calibration needed from mechanical test data,
(ii) the prediction of differential hardening between different monotonic loading conditions on the basis of a single experimental stress-strain curve, and
(iii) the prediction of strain hardening stagnation or softening after strain path change through incorporation of the anisotropic dislocation substructure in the model.
Next, the applicability of such multi-scale material model to industrial (i.e. large-scale) forming processes is considered. The computational effort in FE analysis can be kept to acceptable level through the concept of the hierarchical multi-scale (HMS) material model. The HMS automatically evaluates the local deformation-induced changes in microstructure and provides the FE code with the corresponding evolution in properties of anisotropy and hardening. The coupling of HMS to FE simulation is automatic and has a manageable increase in overall computation time. The HMS concept is illustrated with FE simulations of a 2-stage industrial forming process that locally triggers Bauschinger and cross effects in the material, affecting final geometry and forming forces.

Thursday, October 30, 2014 10:40-11:10 [F-2 Modeling Session]

Fluid Structure Interaction Analysis using Particle Method Software "Particleworks (MPS)" and LS-DYNA

Mr. Hiroshi Kawakami, Prometech Software, Inc.

MPS is a particle method for modeling incompressible flow and it has different characteristics against SPH method for compressible flow. MPS is considered suitable for engineering problems since most of them are regarded as incompressible. In this presentation the differences between MPS and SPH will be discussed. And it will be demonstrated that combination of Particleworks and LS-DYNA is one of efficient way for the estimation of the deformation of vehicle structure, designing products like fuel tank and so on. In addition many application examples of MPS will be introduced.

Thursday, October 30, 2014 11:20-11:50 [F-3 Modeling Session]

Jvision for efficiency improvement of work

Mr. Takanori Katsuta, JSOL Corporation

JSOL has been proposing the efficiency of CAE process by using Jvision.In this presentation some application examples of the useful features and the development plans in the future will be presented.A successful introduction case of LS-DYNA with the customized menu by Jvision（UDI）in Kyosan Denki Co., Ltd. will be introduced.

Thursday, October 30, 2014 13:00-13:30 [F-4 Modeling Session]

Introduction to NUMISHEET and recent research of JSTAMP

Mr. Toshiro Amaishi, Mr. Masahi Arai, JSOL Corporation

NUMISHEET is an international conference in the field of sheet metal forming simulation. In this presentation, the topics of NUMISHEET are introduced. Furthermore, recent research theme of material modeling and forming limit prediction related to sheet metal forming simulation are presented.

Thursday, October 30, 2014 13:40-14:10 [F-5 Modeling Session]

Utilization of CAE Analysis in Production Engineering Department

Mr. Tomohiko Mita, Mitsuba Corporation

CAE analysis is utilized in the plasticity analysis of press/forging process and in the structural analysis of equipment and jigs.It contributes to the reduction in cost and delivery period of tooling and equipment.This report describes the utilization of CAE analysis in the Production Engineering Division of our company.

Thursday, October 30, 2014 14:20-14:50 [F-6 Modeling Session]

Case Studies of sheet metal forming

Mr. Toshiyuki Ogihara, Ogihara corporation

In our company, we went during the forming simulation analysis to process set of sheet forming. However, in order to make the panel good accuracy in a short time, improve the quality of initial test hitting panel is required. So, that analysis of the entire process, is also performed precision analysis further has become necessary. For information feedback of the actual panel, inter-process measurement panel was also required in order to improve the forming analysis at the same time. Will be introduced, including the problem such as by a relatively large product handling.

Thursday, October 30, 2014 10:00-10:30 [G-1 THUMS Session]

Research of Injury Mechanism in Traffic Accidents using Human Body FE Model THUMS

Dr. Yuichi Kitagawa, TOYOTA MOTOR CORPORATION

Human body FE model THUMS was developed to simulate and analyze crash induced injuries on computers. The Version 4 represents the structure of human body parts in detail including brain and internal organs as well as skeletal parts. It enables to investigate injury mechanisms in various accident forms. For example, the relationship between the seatbelt and airbag load and the chest injury risk in frontal impacts, the effectiveness of shoulder airbag in side impacts and the relationship between the impact speed and the head injury risk in pedestrian impacts. The research findings are used to help develop future protection devices and improve injury criteria in international research activities.

Thursday, October 30, 2014 10:40-11:10 [G-2 THUMS Session]

Development and validation of a human body finite element model THUMS: shoulder kinematics and injury analyses during side impacts

Dr. Masami Iwamoto, Toyota Central R&D Labs., Inc.

Previous studies hypothesized that the human shoulder kinematics and injury outcomes during side impact could have significant effects on the severity of thoracic injuries. In this study, we developed a human body finite element model called "THUMS" including the detailed shoulder parts with four articulated joints, which were modeled by bones, ligaments, and muscles. The model was validated against two series of cadaver test data on lateral impacts for the shoulder and side impact sled tests. The effect of kinematics and injuries in the shoulder on the thoracic injuries was investigated and discussed using the simulation results. We confirmed that the developed model was useful for occupant injury evaluations in side impacts.

Thursday, October 30, 2014 13:00-13:30 [G-4 THUMS Session]

Simulations on vehicle-to-cyclist collision with a human finite element model

Dr. Daisuke Ito, Nagoya University

The purpose of this study is to understand the injury mechanism of the cyclist's head and lower extremity in car-to-cyclist accidents. The kinematic behavior of the whole body and the interaction of car, cyclist and bicycle were numerically investigated using a simulation with FE models of the human, bicycle and car. The upper body of the cyclist dropped toward the bonnet with the hip rotating on the bonnet and the upper body twisting due to the interaction between the front structure of the car and bicycle. The knee of the cyclist made contact with the bonnet leading edge and shear loading was generated resulting in ruptured knee ligaments.

Thursday, October 30, 2014 13:40-14:10 [G-5 THUMS Session]

A Study on Influence of Time Degradation and Strain Rate Dependence using Pig Liver with High Strain Rate

Mr. Keita Amo, Tokyo City University Graduate Division

There are many studies of quasi-static characteristics of soft tissue, similar to organs of the human, however the study of dynamic characteristics is not enough. In this study, impact tensile testing machine was developed and impact tensile test was carried out using pig liver, in order to improve good accuracy at high strain rate of soft tissue during car collision. Stress-strain relationships about soft tissue by changing cold storage time and strain rate was grasped. Moreover, the influence of time degradation and strain rate dependence for mechanical characteristic was investigated.

Thursday, October 30, 2014 14:20-14:50 [G-6 THUMS Session]

Simulation based THUMS positioning on LS-DYNA

Mr. Noriyo Ichinose, JSOL Corporation

THUMS is one of the most detailed human FE model and has quite complex structure of the spine, elbow joint, knee joint, and so on. This precise modeling helps us to investigate injury of human under impact loading but makes model positioning more difficult. Unlike FE dummy model, THUMS has no kinematic joint definition (*Constraint_Joint_XXX) at moving parts. This means that almost pre-processor cannot move THUMS parts to desired position with kinematic calculation. One good approach for THUMS positioning is simulation based positioning. However the simulation requires "know-how" to get proper deformation of moving parts. JSOL Seat Designer(JSD) is one of sled analysis system implemented on Oasys/Primer which is developed by Arup. To build the sled model easily, automatic dummy model positioning with kinematic calculation is implemented on JSD. Now we are extending the positioning feature for THUMS on JSD and investigating proper setting for positioning simulation. In this presentation, THUMS positioning feature on JSD will be introduced and show some investigation results about simulation setting for THUMS positioning.

Thursday, October 30, 2014 15:20-15:50

JSOL CAE Solution Roadmap

Mr. Takahiko Miyachi, JSOL Corporation

JSOL products with LS-DYNA, is willing to provide sophisticated added value to the customer, with solution to solve the problems of the customers. JSOL would like to present the roadmap of provided solution as well as development of software products.