Benchmark Testing of Major Cloud Services with LS-DYNA
Mr. Noriyuki Sugiura Electronic Information Exchange Committee Digital Engineering Subcommittee Japan Automobile Manufacturers Association, Inc.
For such as a solution of computing resource shortage, expectations of cloud computing are high. JAMA CAE Cloud Task Team has started to study cloud services aimed at CAE from 2014 and ran performance tests for a few services using LS-DYNA crash simulation. Here we describe about that.
Fracture prediction in Ultra High Strength Steel Sheet
Mr. Takahiro Aito Senior Researcher Steel Research Laboratories Nippon Steel & Sumitomo Metal Corporation
Application of high-strength steel sheet is increasing for achieving both collision safety improvement and weight reduction, in the automobile body development. For exact collision simulation of the automobile 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.
Example of robustness design in the development of crash performance - Reduction of the scatter in full frontal crash by use of DiffCrash -
Mr. Mitsumasa Kuwabara Senior Engineer CAE Department Section8, SUBARU 1st Engineering Division Fuji Heavy Industries Ltd.
In the development of crash performance, the demand for safety improvement and weight reduction have become higher. In this situation, We think that important to improve the robustness for crashworthiness. To this end, We introduce an example which is reduction in the scatter of the vehicle deceleration by use of DiffCrash in full frontal crash. We could get 38% reduction in the scatter of the vehicle deceleration from DiffCrash results which based on some statistical analysis of the deformation mode at front side members.
Mr. Motoki Kobayashi CAE Engineer CAE Div. Humanetics Innovative Solutions Japan Co.,Ltd.
Humanetics offers verification experiments and analysis solutions to variety parts and assembly, also the most up-to-date versions of dummy models. The latest development circumstances of <THOR 50th> <Harmonized Hybrid III 05th> and <Regulated FLEX-PLI-GTR Legform> will be introduced through this speech.
Analysis of Aircraft Impact on Reinforced Concrete Structures using SPH for Modeling Non-Structural Components
Dr. Manoj Madurapperuma Engineering Division Terrabyte Co., Ltd.
Aircraft impact on a reinforced concrete structure causes impact damage to the structure and subsequent fire. Simulation of fuel tank failure and estimation of fuel spilling into the structure are very important for damage assessment including post?impact fire. In the present study, the non-structural components and the fuel of the aircraft are modeled using SPH particles. The study provides more realistic damage behavior of the impacting RC structure and also fuel spilling data for post-impact fire analysis.
Role of Simulation Analysis in Shock-resistant Design of Buildings
Prof. Takuji Hamamoto Tokyo City University
Architectural Institute of Japan (AIJ) published "Introduction to Shock-resistant Design of Buildings" in 2015 for the purpose of securing safety and functionality of buildings against accidental actions such as impact and explosion. Subsequently, AIJ decided to newly add shock load to fundamental design loads of buildings on the occasion of revision of "AIJ Recommendations for Loads on Buildings" in 2015. Under these circumstances, in architectural field there is increasing interest in shock load and its effect on buildings. In this forum, roles of simulation software will be discussed in the design process of buildings against accidental actions.
Mesh Generation of Assembled Objects Using X-ray CT Scanning
Associate Prof. Yutaka Ohtake Department of Precision of Engineering The University of Tokyo
X-ray CT scanning is an effective method for digitizing real products with complex geometry, and now widely used for industrial applications such as metrology and simulations based on real-products. Thanks to the advancement of CT hardware components, we are now able to digitize assembled industrial objects as high-resolution volumes. In this talk, I will introduce CT data processing for assembled objects, for example, CT artifact reduction, parts segmentation, and FE mesh generation utilizing "Simpleware".
Evaluation of Mechanical Properties of Sintered Metal Die Attach Material by Using Three-Point Bending Test and Finite Element Analysis
Mr. Tomohisa Suzuki Researcher Process Engineering Research Department Center for Technology Innovation - Materials, Research & Development Group Hitachi, Ltd.
We evaluated macro and micro-mechanical properties of sintered copper and sintered silver in this study. The macro-mechanical properties were estimated by three-point bending tests and finite element analysis (FEA). We determined macro-yield stress and strain-hardening coefficient by curve fitting technique using the simulated and experimental load-displacement curves. The micro-mechanical properties were estimated by FEA with sintering structure models. FEA models were made from continuous cross section pictures that were observed by focused ion beam-scanning electron microscope (FIB-SEM). We determined micro-Young?fs modulus and yield stress by curve fitting technique using the simulated stress-strain curves and the macro-mechanical properties. As a result, we reveal that sintered copper has higher mechanical properties than sintered silver.
Visualization of transcranial electric stimulation for neurosurgery.
Mr. Ryosuke Tomio Assistant Professor Neurosurgery, School of Medicine Keio University
Motor function preservation is quite important in neurosurgery. Transcranial motor evoked potential (tMEP) monitoring has been widely prevalent, however, theoretical background of transcranial electric stimulation (TES) should be studied more in detail. We studied 1) effects of craniotomy for TES during neurosurgery and 2) effective electrodes montages for TES using 3D head model created by ScanIP and finite element method simulation.
Activity to improve accuracy of sheet metal forming simulation.
Mr. Naohisa Adachi Stamping Die Engineering Section No.2 Stamping Engineering Department Vehicle Production Engineering Division Nissan Motor Co., Ltd.
Introduction of Effectiveness and Examples by JSTAMP
Dr. Hiroshi Fukiharu JSOL Corporation
The effectiveness of CAE and the accuracy of calculation are introduced from two companies which adopted JSTAMP recently. The improvement example that using obtained springback calculation result by JSTAMP makes the surface area ratio of real automobile parts within tolerance better under the tendency to increase high-strength steel is showed. And the calculation result by JSTAMP's compensation function which is compared with experimental data is also reported. These precious data are provided from Fabest corporation and Akiyama corporation.
Approaches on analysis of hole expansion and stretch forming by hot stamping
Mr. Hiroaki Sasaki Hot-forming Development Grp. Y-tec Corporation
Hot stamping involves press forming and quenching (through cooling with die tooling) at the same time after heating a steel panel to over A3 transformation point. Since this realizes both high strength and light weight, it is effective for collision safety and CO2 emission reduction of automobiles. It is necessary to realize the forming of various part shapes with hot stamping, as production of high strength parts by hot stamping has been increasing every year. However, since hole expansion and stretch forming is difficult by hot stamping, analysis is indispensable. In this report, we conducted forming test and JSTAMP analysis regarding hole expansion and stretch forming by hot stamping, and compared the results.
The savings of modelling process of die surface have been an issue to be resolved in die industry. At the very beginning of the design process the modelling of addendum from scratch takes much long time though potential severe errors must be removed at this step. Then the time loss should be avoided. In the further steps it will also take a time even for small changes and it causes the number of tryout to be smaller than expected. JSOL will introduce OmniCAD as a solution for these issues in the die morphing area. OmniCAD is a top quality surface morphing solution with a comfortable platform for manipulating complex and high quality surfaces. It will bring a die design area the fast way for creating data from scratch and maturing it.
Tuesday, 8 November, 10:20-11:20 [1-K-1 General Session 1]
[Special Speech] Advanced constitutive modeling and application to sheet forming process simulations
Prof. Frederic Barlat The Graduate Institute of Ferrous Technology Pohang University of Science and Technology
Continuum constitutive descriptions of plasticity suitable for finite element simulations of sheet forming processes are succinctly discussed in this presentation. Although multi-scale approaches allow for a more explicit representation of the physical deformation mechanisms occurring at microscopic scales, they are usually not suitable for industrial applications because of the quick turnaround time needed for process design simulations. Therefore, advances in classical concepts such as plastic anisotropy and strain hardening are still very much in demand. Actual forming simulation examples conducted in the steel industry are presented for illustration purposes.
Tuesday, 8 November, 11:20-12:20 [1-K-1 General Session 1]
[Keynote Speech] Advanced Material Testing Methods for enhancing high-precision metal forming simulations
Prof. Toshihiko Kuwabara Division of Advanced Mechanical Systems Engineering, Institute of Engineering Tokyo University of Agriculture and Technology
Improvement of the predictive accuracy for defect formation (such as fracture and springback) using FEA is key to realizing trial-and-error-less manufacturing. In metal forming processes, materials are subjected to various multiaxial stresses and stress reversals. Therefore, the validity of the material models used in FEA should be checked by using the material testing methods that accurately reproduce such complex stress states. This lecture reviews the advanced material testing methods for sheet and tubular metals. Special attention is given to the anisotropic plastic deformation behavior of industrial materials and to the validation of the material models for large plastic strain ranges. Additionally, the effects of the material models on the improvement of the predictive accuracy of forming simulations are discussed.
Introduction of Multi-physics -How to setup the data and evaluate the results-
Mr. Shinichi Amano JSOL Corporation
The latest LS-DYNA provides collision, structure, thermal, fluid, electromagnetic and acoustic as the field. And, it has FEM, ICFD, EM, CESE, ALE, DEM, BEM, SPH, SPG, EFG as the feature. Most of these features can interact with each other. In this presentation, procedures such as which method to choose, how to setup the data, how to evaluate the result, will be shown with some applications.
Introduction of Fluid-Structure Coupling Analysis using Structured ALE (S-ALE) in LS-DYNA
Mr. Shingo Yagishita JSOL Corporation
ALE (Arbitrary Lagrangian and Euralian) method has been widely used for Fluid-Structure coupling analysis. Recently Structured-ALE (S-ALE) solver, which is more optimized and accelerates calculation speed, is been developed. The S-ALE solver enables us to apply FSI in new fields. We would talk about how to use LS-DYNA KEYWORD regarding S-ALE solver and comparison between ALE and S-ALE.
In Today's CAE, It has increased the opportunity to deal with a serious problems or multiphysics fields along with the advancement of CAE modeling. Therefore, LS-DYNA had responded to meshfree method such as EFG or SPH quickly, as a solution to strongly non-linear problems which occurs mesh distortion by large deformation with conventional finite element or difficulty fluid-structure interaction problems. LS-DYNA offeres the wide range of choices for problems solving by the corresponding to Discrete Element Method(DEM) from R6 and Smoothed Particle Galerkin Method(SPG) which is a proprietary technique of LS-DYNA from R8. In this presentation, we'll introduce the summary of meshfree method in LS-DYNA or use of guidelines of each methods and application examples.
Muscle Modeling and Controller for THUMS Version 5 and 6
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. have developed a human body FE model called THUMS (Total HUman Model for Safety) with Toyota Motor Corporation to simulate gross motions and multiple injuries of human body during impacts. In 2015, THUMS version 5 containing multiple 1D active muscles in whole body were released. We have a plan to release THUMS version 6 consisting of THUMS version 4 and multiple 1D active muscles in whole body. The muscle modeling and control methods that are or will be used for THUMS Version 5 and 6 are introduced at this forum. In addition, application examples of THUMS Version 5 with a muscle controller will be presented to demonstrate why we need to consider muscle activity for occupant safety research.
Development of a liver model with consideration of blood vessels and application to a human FE model
Dr. Daisuke Ito Assistant Professor Department of Mechanical Science and Engineering, Graduate School of Engineering Nagoya University
In this study, a liver FE model with consideration of blood vessels was developed and was applied to the THUMS model in order to examine injury mechanism of liver in impact. The liver FE model was subjected to simulations of a dynamic compression test using perfused liver specimens. The liver FE model was validated by comparison of force-compression ratio relation between FE analysis and experiments. The THUMS model with the liver model taking into account blood vessels was subjected to rigid bar impact against abdominal area. Stress concentration around portal veins was observed in the liver model.
Impact Analysis on Human Body in Rocket Launch Abort System
Prof. Shinsuke Sakai School of Engineering University of Tokyo
For the design of manned rocket system, impact analysis on human body is necessary. Compared with the car impact analysis, some difference exists in space field. For example, vertical acceleration must be considered in the analysis. In this presentation, application of THUMS on human body impact analysis and the development of impact criteria at launch abort system will be introduced. The comparison of results between Hybrid III and THUMS will also be introduced.
Guide to the choice of element for reasonable simulation results
Mr. Norio Shimizu Mr. Masahiro Takeda JSOL Corporation
The choice of the element type is the key to obtain a reasonable result from the simulation. Recently LS-DYNA has expanded its range of application by implementing various new element types including high-order elements. This allows users employ elements suitable for each simulation. However, it may cause possible incorrect choice of elements which leads to unexpected results. This session describes summary and characteristics of different elements available in LS-DYNA to perform simulations with well-chosen elements, along with the typical problems arise from wrongly-chosen elements and remedies for the problems. Example situations and applications of element in the actual simulation will also be introduced.
Introduction to the modeling method of adhesive in LS-DYNA
Ms. Sumie Kinouchi JSOL Corporation
Recently, use of aluminum and plastics has increased in order to reduce weight of the vehicles, and the use of adhesive bonding has also increased to join different materials. In this presentation, we will introduce the modeling method of adhesive bonding in LS-DYNA. In addition, we will introduce a MDO (Multi-disciplinary Design Optimization) example about a crash box with adhesive bonds using LS-OPT.
In recent years, light weight design has been required especially in automotive industry in order to meet strict safety and fuel emission standard as well as riding comfort and maneuverability. In order to achieve the requirements above, well balanced product design is one of the key factors, and taking into account influence from scatter in production (material, forming, assembly) and scatter in operation (operation condition and environment). In general, study with computer simulation is conducted in deterministic manner. However, LS-DYNA has a feature to generate model with scatter in geometry and material properties and enables conducting stochastic studies by running these models multiple times. In this session, stochastic features in LS-DYNA are introduced with examples.
Wednesday, 9 November, 13:00-13:30 [2-B-4 New Field Session]
Study on the Simulation of the Ultra-high Electromagnetic Field Generation Ⅱ
Mr. Kunio Takekoshi Sub Manager Engineering Div. Engineering Dep. 1 Terrabyte Co., Ltd.
Electromagnetic forming is a method to deform electrical conductive metals at high speed using Lorentz force excited by electric current in the metals. Many physics like induced current, Lorentz force, temperature change and high speed deformation are simultaneously happening in the method. Thus simulation of the electromagnetic forming requires high-level coupled simulation techniques.
LS-DYNA provides an electromagnetism solver since the release of version R7, and enables us to carry out thermal-structural-electromagnetic coupled simulation within a LS-DYNA solver. In this presentation, simulation of the ultra-high electromagnetic field generation which employs the electromagnetic forming techniques is reported.
Wednesday, 9 November, 13:35-14:05 [2-B-5 New Field Session]
Prediction of Uneven Tire Wear Using Wear Progress Simulation
Mr. Ryota Tamada Assistant Manager Research Dept. ‡T Research & Development HQ. Sumitomo Rubber Industries, LTD
Tire uneven wear decreases tire life locally and has the potential for causing a noise problem so it is very important to improve uneven wear performance for long life tire. In order to experimentally evaluate uneven wear performance accurately we have to do time-consuming tire road tests. In this study, we introduce "Wear Progress Simulation" developed in order to evaluate uneven wear performance. This method involves "wearing-out the FE tire model" using wear energy calculated from tire rolling simulation.
Wednesday, 9 November, 14:10-14:40 [2-B-6 New Field Session]
Technology and Analysis for Supporting Water Stoppage in Piping
Dr. Yukari Fukushige Researcher Corporate Research & Development, Numerical Analysis Department IHI Corporation
Water filling of primary containment vessel (PCV) is necessary to remove the fuel debris. The repair technology, the water cutoff material (grout) pouring to the vent piping at the lower section of PCV, is investigated. In this method, sealing support material temporarily stops water flow to prevent leakage of the grout to the suppression chamber (S/C). In this talk, experimental and analytical investigations of the sealing support material are introduced.
The recent and future developments of JSTAMP will be presented. The presentation about the recent developments will focus on useful features developed for the last 1-2 years as well as the new features planned to be released this year.
Precision Bulk Metal Forming Simulation Considering Die Elastic Deformation Due to Shrink Fit and Thermal/Mechanical Load
Prof. Mansoo Joun Mechanical Engineering Gyeongsang National University(GNU), KOREA
In this presentation, new functions of AFDEX are introduced with emphasis on precision forging simulation considering elastic deformation of the dies or press due to mechanical load and thermal loads. The effects of temperature change and/or shrink fit of the dies on material deformation as well as die stress are considered. Various application examples are introduced, which involve cold forging and hot forging under assumption of rigid-thermoviscoplasticity or elastothermoplasticity. The predictions are discussed to reveal the effect of some theoretical or numerical/practical assumptions especially on the forming load.
Pellet Shape Optimization for Flowability of Resin Pellets
Dr. Liu Jihong Team Leader Technology and Innovation Center Daikin Industries, Ltd.
We proposed a simulation approach based on the dynamic explicit finite element method to evaluate the flowability of resin pellets, which are filled to a hopper by free-fall and then flow out from the hopper by gravity. Using the proposed simulation method, we clarified that the shape of the resin pellet had a large influence on its flowability, and found an optimal oblate and prolate spheroid pellet shape respectively that can improve the flowability of the resin pellets. Key Words: Resin Pellet, Flowability, Optimal Pellet Shape, Oblate Spheroid, Prolate Spheroid, Dynamic Explicit FEM, LS-DYNA.
This presentation is an introduction of new features of Digimat 2016.1. Digimat is simulation software for predicting composite material properties. The latest version Digimat 2016.1 was released in June from e-Xstream, and many functions are enhanced. It brings workflow efficiency improvement allowing structural engineers to cut down simulation preprocessing time and facilitate FEA computation. Digimat becomes to support fatigue model as a new function, and now we can apply Digimat to wider fields analysis. I will introduce details about these new functions.
Modeling Approach for Composite Forming Simulation using LS-DYNA
Mr. Masato Nishi JSOL Corporation
The difficulty of controlling the deformation behavior of fiber reinforcements and pre-pregs during the forming process has prevented it from being widely applied in high cycle mass production. Because simulation is an effective way of minimizing the associated product development costs, JSOL has been working on using LS-DYNA for simulating the behavior of composite materials, such as dry fiber reinforcements, thermoset and thermoplastic pre-pregs. This talk will introduce modeling approaches focused on capturing out-of-plane bending deformation in order to predict the onset and formation of wrinkles, which is the most common defect. Furthermore, verification by means of comparison with actual experimental deformations will be reported.
Compression Molding simulation by coupling with LS-DYNA & Moldex3D
Dr. Tober Sun Manager Product Division CoreTech System Co., Ltd.
Recently, the needs of plastic composite material in automotive and aerospace industry increase significantly due to light-weight trend. In order to get better mechanical properties as metal material hitherto, people use short fiber, long fiber and recently fiber mat or even continuous fiber as the reinforcement material. Therefore, the needs of CAE simulation software also increase dramatically because of the complicate behavior between fiber and polymer matrix. We develop a solution which combines the advantage of LS-DYNA and Moldex3D to simulate fiber mat or continuous fiber charge behavior in compression molding. Through the solution people can get more reliable result to analyze the potential problem in the molding process.
Basics of LS-DYNA 4 : effective measures for error terminations.
Mr. Hodaka Oda JSOL Corporation
TBA
Wednesday, 9 November, 15:00-16:00 [2-K-1a General Session 2]
Development of THUMS Version 4 Child Models
Dr. Yuichi Kitagawa General Manager Advanced CAE Div. Safety CAE Technology Development Dept. Toyota Motor Corporation
THUMS is a human body FE model for simulating injury in vehicle collisions. Toyota Motor Corporation and Toyota Central R&D Labs., Inc. have jointly developed and updated THUMS. The newest versions are four and five. The new Version 4 child models will be described, and application example of Version 5 will be also presented.
Wednesday, 9 November, 16:00-17:00 [2-K-1b General Session 2]
Recent Development in LS-DYNA
Dr. David J. Benson Livermore Software Technology Corporation
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Simultaneous interpretation
