[Keynote Speech] 15:50 - 16:50
LS-DYNA Status & Development Plan
Dr. John Hallquist, Livermore Software Technology
Wednesday, October 29, 2014 10:00 - 11:00
[Keynote Speech]
Achieving Design Targets by Stochastic Car Crash Simulations
Mr. Yukio Oka, TOYOTA MOTOR CORPORATION
This speech presents that Stochastic Car crash Simulations with the precise and detailed geometry of Car crash safety FEM model are effective for achieving design targets of car structures.
Wednesday, October 29, 2014 11:00 - 12:00
[Keynote Speech]
Numerical modelling of damage progression in fibre-reinforced plastic composites
Dr. Tomonaga Okabe, Tohoku University
The previous studies on the damage and mechanical modelling of fibre-reinforced composite materials, especially carbon-fibre-reinforced plastic composites, are presented based on the findings of recent studies conducted in conjunction with other researchers. Studies that utilized various modelling scales, ranging from macroscopic to microscopic, are considered. The modelling of impact damage, ply cracks, ultimate tensile failure, the initiation of transverse ply cracks, the micro-mechanical properties of interfaces and molecular dynamics are specifically addressed. In addition, the scope for future work in the field is described.
Wednesday, October 29, 2014 13:00 - 13:45
[Special Speech]
The application example of Simpleware to structural analysis of foamed plastic.
Dr. Tsuyoshi Nishiwaki, ASICS Corporation
In order to produce the light shoe sole with higher shock attenuation, foamed plastics have been widely used. It has been said that the mechanical behavior under the compression is so complicated. In case that the higher functional shoe sole is designed, the effects of matrix properties and microscopic foam shape on the mechanical properties must be quantitatively clarified. In this study the application example of Simpleware to the 3-dimentional structural analyses are introduced. The microscopic FE model is created by Simpleware and CT images obtained from X-ray radiation, the validity of the modeling is checked by the comparison with experimental results. Finally the practical products developed by the above simulations are also introduced.
Wednesday, October 29, 2014 14:00-14:30 [A-1 Manufacturing Session]
Recent and Future Developments of JSTAMP
Mr. Nobuhiko Sugitomo, JSOL Corporation
The recent and future developments of JSTAMP product line will be presented. Topics in the presentation will include the latest enhancements of the die face design feature JSTAMP/Creator as well as those of the core simulation package JSTAMP/NV.
Wednesday, October 29, 2014 15:20-15:50 [A-3 Manufacturing Session]
Case Study of cold forging simulation using AFDEX
Mr. Masato Tamura, Iwate Digital Engineer Training Center
Iwate Digital Engineer Training Center is working to technical assistance of 3D tool and training of digital engineers in order to enhance the competitiveness of local manufacturing industry by grans Iwate and Kitakami.This report introduces the Case Study of cold forging simulation worked as technical assistance to Natec Co.,Inc using AFDEX.
Wednesday, October 29, 2014 16:20-16:50 [A-4 Manufacturing Session]
Metal flow line predictions and its application to metal forming process design
Dr. ManSoo Joun, MFRC Corporation(Gyeongsang National University(GNU))
Metal flow lines formed during metal forming have deep influence on the product quality of forged products. A new approach to predicting the three-dimensional metal flow lines is introduced. Some typical predictions of metal flow lines in forging and plate forging obtained using the new approach to predicting them are presented.
Wednesday, October 29, 2014 14:40-15:10 [B-2 Automotive Session]
Airbag Design Evaluation using Optimization and Morphing
Mr. Hiroyuki Saito, Autoliv Japan Ltd.
By the notable improvement of CAE calculation performance such as MPI parallel calculation, optimization engine based CAE evaluation has become more and more common today. In addition, in order to propel the front-loading of the development process, CAE plays an increasingly significant role in the product development. In this report we discuss the airbag design evaluation using optimization and morphing technologies. By the combinatorial technology of parameterized FEM model with morphing and optimization engine, airbag cushion shape, cushion thickness for each head impact point and cushion volume are successfully optimized in order to meet the required design requirements.
Wednesday, October 29, 2014 15:20-15:50 [B-3 Automotive Session]
Automatic processing of LS-DYNA models according to EuroNCAP and other protocols
Mr. Richard Taylor, Arup
For crash safety consumer tests (NCAP, IIHS, etc), there are complex protocols for calculating and presenting results. To post-process LS-DYNA results into the format required is very time-consuming for the analyst. Arup Software Version 12 includes out-of-the-box templates for automatically post-processing LS-DYNA results according to these protocols, and generating reports in the correct style. In this presentation, we will show the reporting process for frontal ODB impact (EuroNCAP , IIHS and CNCAP); frontal FFB impact (EuroNCAP); frontal Small Offset Barrier (IIHS); side impact (EuroNCAP Side MDB and Side Pole); and pedestrian analysis (EuroNCAP). Additionally, we show an example of a fully automated process for pedestrian analysis, including pre-processing as well as post-processing.
Wednesday, October 29, 2014 16:20-16:50 [B-4 Automotive Session]
Study of the energy absorbing member using a composite material
Mr. Satoshi Ikeda, FUJI HEAVY INDUSTRIES LTD.
In recent years, weight reduction of the vehicle body due to electrification and Environment is demanded. On the other hand demand for crash safety is also increasing. Against the background of these, we conducted a study of the energy absorbing member having an excellent high energy absorption and lightweight. We analyzed the test results were carried out crushing test a prototype using a cylindrical composite. In addition, we report for carrying out the technical development of CAE.
Wednesday, October 29, 2014 14:00-14:30 [C-1 Convergence Engineering Session]
Cooperative applications of CAD, FEA, RP and CAM in field of orthopedics
Dr. Yoshitaka Nakanishi, Kumamoto University
Applications of CAD, FEA, RP and CAM in orthopedics, especially in the development of an intramedullary (IM) nail, are introduced. A CAD model of femoral bone, constructed from a CT dataset, was assembled with a CAD model of an IM nail for FEA. A physical, preproduction prototype of the nail was processed via CAM, and a bone model with similar morphological characteristics of natural bone was 3D printed with urethane resin. A peritrochanteric fracture was modeled and fixed by the nail, and then tested under an axial mechanical load. Deformation under load was measured with a 3D laser scanning device. Evaluation of the proposed nail is discussed using the results of the FEA and mechanical analyses.
Wednesday, October 29, 2014 14:40-15:10 [C-2 Convergence Engineering Session]
X-ray computed tomography observations of impact-damaged CFRP composite laminates
Dr. Kohji Suzuki, Chiba Institute of Technology
In this study, impact damages were introduced into carbon fiber reinforced plastic (CFRP) composite laminates with various stacking sequences and with or without a flexible damping sheet inserted into central interfaces, and their X-ray computed tomography (CT) images were successfully obtained and then numerically analyzed by using the CT image processing software. simpleware ver. 6. It was found that there was a certain relation between impact energy absorptions and CT damage areas. In addition. vibrational modal tests were also carried out to the present specimens with impact damages so that some new damage modeling schemes could be proposed.
Wednesday, October 29, 2014 16:20-16:50 [C-4 Modeling Session]
Practical Use of CAE in the Structural Design of Air Conditioning Units
Dr. Jihong Liu, DAIKIN INDUSTRIES, LTD.
Daikin Industries has been developing an ideal way to apply CAE technology to the structural design of air conditioning units since the mid-1980s. Now, CAE technology is widely utilized for the structural design of air conditioning units, and it contributes to the faster product development and more efficient resulting products. In this presentation, I will introduce the validation and verification of the drop impact simulation technology for air conditioning units and its application to product development. Additionally, I will discuss the importance of the verification and validation of the simulation results and understanding of the principles that govern the physical phenomena for further practical use of CAE technology. Furthermore, I will introduce the air conditioning units packing specification which won the Japan Star Award of Japan Packing Contest 2013 and which was based on the aforementioned drop impact simulation results.
Wednesday, October 29, 2014 17:00-17:30 [C-4 Modeling Session]
Overturning Analysis for gravestone of legal wife in Mr.Ikeda as domain head of Tottori.
Mr. Yasuhiro Ookawa, Tottori Prefectural Bord of Education Secretariat
A public interest incorporated foundation named "Gravestone of legal wife in Mr.Ikeda as domain head of Tottori Preservation Association"(PA), requested JSOL to evaluate gravestone's overturning in order to plan the construction to restore gravestone of legal wife. There are gravestones of cadet family, wife and domain head who make 32 million koku. These grovestones are some of greatest Daimyo's grovestones in Japan. PA tries to improve this place. This analysis is to consider aseismic capacity of structure of gravestone which consists of the layer of stones without fixing. We've got profitable remark to take the plan to improve into consideration.
Thursday, October 30, 2014 10:00-10:30 [E-1 Occupant Safety Session]
Latest LS-DYNA models status of the Harmonized HIII 50th and THOR-M crash test dummies for New safety accessment crash test configuration
Dr. Intaek Lee, Humanetics Innovative Solutions Japan
Harmonized Hybrid III 50th is being introduced to market and injury responses and target criteria should be newly validated with engineering designs. To help understanding the change of performance, comparisons to each previous brand Hybrid III 50th are presented. THOR-M dummy FE model is also presented with the development processes from material, component, sub assembly and full assembly testing validation. The current development status has shown very reasonable predictive capabilities of these two models as evident in the illustrated loading conditions which range from component to full dummy level and robustness check for numerical stability.
Thursday, October 30, 2014 10:40-11:10 [E-2 Occupant Safety Session]
Simulation-Based Airbag Folding System JFOLD Version 2 -New Capabilities and Folding Examples
Mr. Shinya Hayashi, JSOL Corporation
Computer simulation is playing an increasingly important role in the design, development and application of airbag safety systems. As folding patterns and airbag structures become more and more complex, users are turning to simulation based folding solutions to generate accurately folded models in a short space of time. To meet this demand, a new software tool called JFOLD has been developed by JSOL Corporation to enable successful airbag folding using LS-DYNA. JFOLD's intuitive and interactive system guides the user through the folding steps using flow-chart graphics, interactive tool positioning/resizing, tool motion control, animation preview and more. This presentation introduces the new capabilities of JFOLD Version 2 and demonstrates various folding examples. JFOLD runs inside the powerful and popular pre-processor Primer.
Thursday, October 30, 2014 11:20-11:50 [E-3 Occupant Safety Session]
JSOL Seat Designer - Introduction of Integrated Seat Design System for LS-DYNA
Mr. Noriyo Ichinose, JSOL Corporation
In this presentation, an introduction of JSOL Seat Designer is presented and some advanced features demonstrated. JSOL Seat Designer consists of three different systems and a GUI. The first is a database management system, which manages master models of dummy, seat, BIW and so on. The database manages not only keyword filenames but also additional information for automatic assembling. Thanks to the database management system, the user needs no effort to find suitable master models on their server and miss-communication between engineers in the case of multiple seat analyses is reduced. The second system is automatic assembling, whose main features are:
- Automatic model assembling
- Automatic setting for typical crash regulation and assessment.
- Automatic positioning for dummy and seat
- Simulation based h-point measurement
- Simulation based pre seat deformation
The final system is for seat modeling. This system has tools dedicated to seat structure modeling. Although only a few tools will be built in ver1.0, we are planning to add several tools for seat cover fitting, material parameter identification and THUMS positioning in the next version.
Thursday, October 30, 2014 13:00-13:30 [E-4 Material Modeling Session]
The simulation of fracture prediction by the damage model GISSMO in sheet metal
Dr. Junya Naito, KOBE STEEL,LTD.
Requirement for improvement in the collision safety of the car body and demands for a car body weight saving are growing every year, and the strength of steel used in car body is increasing. Due to reduction of ductility caused by thinner thickness and higher strength of the material, numerical fracture prediction in car body collision is strongly required.In this study, fracture strain corresponding to stress triaxiality is evaluated by several kinds of experiments for sheet material. Also, fracture criteria are identified and introduced to the damage model GISSMO in LS-DYNA. Furthermore, numerical fracture prediction using the above model is conducted for the tensile testing and quasi-static crush test of HAT member. We discuss the validity of the damage model GISSMO for high strength steel and aluminum alloy sheets by comparing experimental and numerical results.
Thursday, October 30, 2014 13:40-14:10 [E-4 Material Modeling Session]
Forming simulation of fiber reinforced composite materials
Mr. Masato Nishi, JSOL Corporation
Fiber reinforced composites are a good alternative for metals used in load transmission structures. The increasing requirement for high performance with weight reduction in industry has gradually expanded the use of fiber reinforced composites. One of the reasons for the expansion is that the development of manufacturing process has reduced its cycle time for its wide applicability to the mass production. Material behavior of fiber reinforced composites during forming is significantly different from metal forming. Thus numerical simulation of fiber reinforced composites is strongly desired today. In this talk, forming simulation of textile reinforcement and thermoplastic pre-impregnated composite by LS-DYNA will be presented.
Thursday, October 30, 2014 14:20-14:50 [E-4 Material Modeling Session]
Fracture prediction in Ultra High Strength Steel Sheet
Mr. Takahiro Aito, Nippon Steel & Sumitomo Metal Corporation
The increasing application of higher strength steels to achieve both crash safety and weight reduction has been demanding the various considerations in the development of body in white. For this purpose, crash simulation is already used widely as one of the most helpful tools. It is important to grasp material property for more accurate crash simulation. In this report, unique simulation method for the fractures of materials using both stress based forming limit diagram (FLSD) under stretch-bending and critical strain at outer surface obtained from a V-bending test were proposed, base on experimental and theoretical investigations. Furthermore, a new fracture prediction method was applied to three-point bending simulation of a hat-column.
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.
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