Mr. Takeshi Numajiri Product Engineering Department, Engineering Solutions Technical Unit Ⅱ, Engineering Solutions Business Operations Information Services International-Dentsu, Ltd.
Mr. Masaki Ueno Manager Crash Safty Techonology, Crash Safety Development Dept. Mazda Motor Co.
16:55 | 17:05
Closing
Thursday, 5 November, 2015 9:40-12:20 [1-K-1 General Session 1]
[General Session] JSOL's solution map
Mr. Takahiko Miyachi JSOL Corporation
Recently Cae is must tool for manufacturing industry, whereas it is required to carry more complicated and important role. JSOL has been trying to be a part of customer's product development in each phase of structure, material and manufacturing. Recent and future development of JSOL's CAE solution will be introduced in this session.
[Keynote Speech] Multiscale Defect Mechanics - Turn Defects in Materials to Strengthening of Materials -
Dr. Yoji Shibutani Professor Department of Mechanical Engineering Osaka University
Macroscopic plastic deformation is based on the dislocation, which is the atomic-scale slip on the close-packed atomic plane of the crystalline lattice. The hundred-millions line defects of dislocations are penetrating in a plane of one square meter and dynamically moving at the picosecond. Finally, this irreversible movement gets settled at the equilibrium state and the plastic deformation can be realized. The multiscale modeling across the vast time and scale gap is really crucial. One of the recent approaches is the information transfer of materials properties and deformation mechanism. Large-scale molecular dynamics simulations on the defects behaviors under deformation are presented in my talk. Defect nucleation and defect interaction between the line defect of dislocation and the planar defect of grain boundary are much emphasized. The defect interaction disturbs the dislocation movement and it actually leads to the materials strengthening.
[General Session] Recent Development in LS-DYNA
Dr. John Hallquist Livermore Software Technology Corporation
Mr. Satoshi Ikeda SUBARU ENGINEERING DIVISION CAE DEPARTMENT Fuji Heavy Industries Ltd.
We have focused on the "lightness and high energy absorption property" of composite materials and found that the crush box made of these materials absorbs a sufficient energy under static condition. But considering full vehicle crash analysis, there are some issues which are calculation time, calculation stability and dynamic characteristic of the material. To solve these issues, we tried modeling of just the crush box to validate a correlation between simulation and experiment. We used shell model and parameters of the friction, and found that the simulation result nearly reproduce the load of the experiment.
Meso-Scale analysis of random long fiber composite material, and analysis method in consideration of random orientation using MAT058
Mr. Seiji Hayashi Technology Development Division 9, Department 2, Automobile R&D Center Honda R&D Co.,Ltd.
Dr. Masato Nishi JSOL Corporation
About random long fiber composite , The mechanism of failure was analyzed about each phenomenon of tension and bending using Meso-Scale model which created from DIGIMAT-FE. Based on this result, the material model which gave random strength for each integration point using MAT058 was constructed so that it might become the same as actual phenomenon. Report the verification result of coupon and component in this material model.
Case Example of Applying LS-DYNA in Automobile Seat Development
Mr. Yuki Miyazawa CAE Section TS TECH Co.,Ltd.
There are various strength requirements for automobile seat, and in order to meet the requirements, we have been utilizing LS-DYNA from the early design phase.With the evolution of the computing server and the addition of new features of LS-DYNA in recent years, it has become possible to conduct analysis, which could not be achieved in the past.In this report, we introduce the example of the analysis model in automobile seat development.
Model test of longitudinal ultimate strength of ships assuming side collision damage and validation of numerical analysis methods
Dr. Yasuhira Yamada Structural Strength Evaluation Department National Research and Development Agency, National Maritime Research Institute
Analysis of reinforced concrete walls due to impact of vehicles during tornadoes
Dr. Manoj Madurapperuma Engineering Division Terrabyte Corporation
Protection of critical facilities against impact of heavy objects during tornadoes has drawn much attention after the recent destructive tornadoes in Japan. In the present study, impact damage to reinforced concrete walls is evaluated using two types of detailed finite element models of vehicles having different weights and sizes, and reinforced concrete walls. It is seen that damage to the impacted wall varies depending on vehicle type, speed and impact orientation. Set of equations are proposed to approximately estimate scabbing and perforation limits of the wall due impact of vehicles during tornadoes. The results could be useful for engineers and researchers.
Explicit Dynamic Method to Quasi-Static Deformation Analysis of Multi-Split Type Air-Conditioning Outdoor Units
Dr. LIU JIHONG Environmental Technology Laboratory Daikin Industries, Ltd.
Generally speaking, it is difficult to obtain simulation results for a nonlinear quasi-static problem of a large-scale structure using the static implicit FEM. This is because not only the calculation cost such as necessary memory consumption becomes enormous but also iterative calculation does not often converge for a large-scale analysis model in consideration of the contact between the parts and material nonlinearity of the structure. Therefore, in this paper, we tried to perform a torsion deformation analysis of a multi-split type air-conditioning outdoor unit using the dynamic explicit FEM with the system damping method and mass scaling method. The torsion displacement based on the dynamic explicit method shows good agreement with the test result. It is found that the dynamic explicit method has an advantage in nonlinear large-scale model analysis.
Charge-discharge and degradation analysis of 3D structured electrodes of Li-ion batteries using Simpleware・/dt>t
Dr. Tatsuya Yamaue Engineering Mechanics Division Kobelco Research Institute, Inc.
Lithium ion battery electrode have complicated 3-dimensional structures composed of active material, conductive agent, binder and electrolyte. Here, 3D aggregation structures of battery electrodes are modeled based on 3D FIB-SEM image analysis with Simpleware ., and analysis results of the electrochemical reaction and Li concentration during charge-discharge process are discussed with degradation phenomena.
Effects of layered structure of mouthguards on anterior teeth
Dr. Masao Tanaka Professor, Graduate School of Engineering Sceicne Osaka University
Athletic injury in oral region is an important aspect in sports and dental medicine due to the health enhancement through sports activities. The use of mouthguards is strongly recommended to reduce the risk of dental injury, and its advantages are mainly investigated through many cohort studies. However, its quantitative effects have not been well understood from the viewpoint of dental sports biomechanics. In these days, the layered structure is suggested by clinicians especially for the case of heavy duty use. The authors are interested in how the layered structure contributes to the injury prevention. From the dental CT images, alveolar bone, dentin, enamel, periodontal ligament are segmented, and the teeth-bone complex reconstructed with bi-layered mouthguard are discretized for finite element analysis by using ScanIP with +FE module. The effects of different combination of elastic properties of mouthguard materials used for inner and outer layers were investigated by using ANSYS under the anterior contact force and the effects of layered structure was examined.
Recent development of ICFD and EM in LS-DYNA and coupling features
Mr. Hiromichi Ohira JSOL Corporation
Multiphysics features in LS-DYNA such as ICFD and EM have been developing focusing on coupling features with conventional structure analysis and thermal analysis, and each multiphysics solver. This session will briefly introduce the basic features of these solvers and recent development topics. Flow analysis around moving valve (ICFD+structure), Hot forming considering cooling pipe (ICFD+structure+thermal), Induction heater analysis (ICFD+EM+structure+thermal), Resistive heating analysis (EM+structure+thermal), are scheduled to be introduced.
The suggestion of several ways to use frequency analysis with LS-DYNA and Introduction to new upcoming seminar
Mr. Ryo Ishii JSOL Corporation
A lots LS-DYNA users who evaluate acoustic/frequency domain analysis has been increasing these days. To get them to use these function evermore and lead them to employ these analysis as a new usage of LS-DYNA, we will explain some advanced analysis related with vibration. We will effort to illustrate the content giving something helpful to design of product as possible.
[detail of presentation]
-statistic s analysis with MAC(Modal Assurance Criterion)
-statistic design of multi-layer material combination with MAC
-Introduction to new seminar about acoustic/frequency analysis in 2016
Latest LS-DYNA models status of various crash test dummies for New safety accessment crash test configuration
Dr. Intaek Lee CAE Humanetics Innovative Solutions Japan
Corresponding to various NCAP program, various LSdyna FE dummy models have been developed and validated with specific loadings considered actual loading for car designs. To help understanding the change of performance, comparisons to each previous brand and models are presented. Q dummies, Euro-NCAP compliant dummy, THOR-M dummy FE model is also presented with the development processes from material, component, sub assembly and full assembly testing validation and certification. The current development status has shown very reasonable predictive capabilities of these various models as evident in the illustrated loading conditions which range from component to full dummy level and robustness check for numerical stability.
Predict breaking plastic parts of vehicles at Low temperature.
Mr. Kazushige Hashimoto ADVANCED DEVELOPMENT DEPT Nihon Plast Co., Ltd.
We study about predicting spatter plastic parts while airbag deploy. The MAT card is various. We judged that SAMP-1 is suitable for the purpose, because this MAT card consider break with speed dependence and triaxiality stress degree. However, we must test the high-speed pulling examination and more to create the SAMP-1 model and examination costs is high by a man-hour and the trust examination. I performed a substitution of these examinations in falling weight test. Finally we raise precision and can predict whether breaking plastic parts. We explain series of the development.
Analysis of Unsteady Aerodynamics of a Car Model with Radiator in Dynamic Pitching Motion using LS-DYNAR
Mr. Jiro Takamitsu Advanced CAE Div. Thermal System & Aerodynamics Dept. Toyota Motor Corporation
The numerical simulations of unsteady aerodynamic forces acting on a car model with an engine compartment containing a radiator in dynamic pitching motion were conducted using new porous media computing function on LS-DYNA ICFD solver. Compared with the results of the previous study using a car model without an engine compartment, significant differences in unsteady aerodynamic forces acting on the car model were revealed. As a result of this study, it was clarified that the cooling-air flow passing through a radiator interfered with the external flow, especially with the flow under the body, and consequently, the differences in the flow field under the body occured and it greatly affected unsteady aerodynamic forces acting on a car model.
Application cases of press-molding simulations with JSTAMP
Mr. Soichi Nakamura Manufacturing Technology Research Division Mie Industrial Research Institute
Mie Prefecture Industrial Research Institute supports companies which can apply to the new technical development and advanced needs. Recently advice on simulations has been provided.
In order to apply press-molding simulations to productive activities, knowledge not only on press-molding but on simulations is needed, so it is difficult for small and medium-sized companies to use press-molding simulations.
In this presentation, cases on improvement of high-strength steel sheets analysis precision (acquiring, analysis, practices and evaluations of material parameter) have been given. It was one of the themes in an upgrading-analysis-accuracy project seminar held for small and medium -sized companies.
The utilization case of CAE in the spring back in a Chinese Stamping Dies manufacturer (LIO FUNG TOOL&DIE (KUNSHAN) CO.,LTD)
Mr. Kyoji Kudo Study and development department LIO FUNG TOOL&DIE (KUNSHAN) CO.,LTD
High tension material beyond 590Mpa is being used by stamping parts in China in recent years. In LIO FUNG TOOL&DIE. It increases in the ratio of the work of these Dies. Experience and the sense in the past which is so far were used.
By such way to do possibility in the spring back. But reduction in cost and reduction in lead time can't be expected by such.
Therefore JSTAMP/NV and Matpara were introduced and CAE in the spring back was adopted in August of last year.
They're its process of the introduction and way process this time, but I'll report on a result and a problem.
Activity of plastic blow molding CAE
Mr. Toru Tetaka Production Engineering Division Yachiyo Industry Co., Ltd.
Thursday, 5 November, 2015 15:30-17:10 [1-C-2 Material Modeling Session]
Analyses with tests using human tissue materials in consideration of age-related degeneration and associated perspectives : Aiming for personalized analyses of spinal diseases
Dr. Norihiro Nishida Assistant Professor, Department of orthopedics surgery, Graduate School of Medicine, Yamaguchi University
Dr. Junji Ohgi Associate Professor, Graduate School of Medicine, Yamaguchi University
For spinal diseases caused by injuries and degeneration with major impacts on daily life, a variety of treatments have been developed, and various pathological analyses have also been performed employing the finite element method. However, we have not reached the stage of predicting outcomes preoperatively for individual patients. This is because there are many problems awaiting resolution, such as individual differences in the skeleton and age-related degeneration of human tissues. We are moving ahead with a plan for conducting analyses employing Simpleware and LS-DYNA, with the intention of using the results of the analyses of image data and material properties of human tissues obtained during surgery in patients with spinal diseases. We herein report the results and associated perspectives of these analyses.
The numerical failure prediction by the damage model GISSMO in various materials of sheet metal
Mr. Shota Chinzei Multi-Material Structural Design and Joining Section Mechanical, Engineering Research Laboratory Kobe Steel,Ltd.
Responding to continuous demands for weight saving and enhancement of collision safety of vehicles, high-strength steel sheets are widely used for car bodies. Also, the applications of aluminum sheets are increasing for seeking more lightweight, recently. In applying sheet metals with thinner thickness and higher strength to car bodies, numerical failure predictions are strongly required to ensure collision safety, since the reduction of ductility becomes key issue for these materials.
Various failure models for failure prediction of sheet material in car body collision are proposed, and model considering the failure criterion depending on stress triaxiality is one of the most leading ones. For instance, the damage model GISSMO (Generalized Incremental Stress-State dependent damage MOdel) has been developed by Daimler and DYNAmore, which includes incremental formulation for the description of material instability and localization.
In this study, failure curves for GISSMO are identified by experimental data on several sheet materials, namely, PHS (TS 1500MPa grade), UHSS (TS 980MPa grade), aluminum alloy 7000 series. Numerical failure prediction using GISSMO is conducted for the quasi-static axial 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.
Crash simulation of adhesively bonded automotive structures - the need for rate-dependent material data
Dr. Michael May Dynamics in Microstructures Fraunhofer EMI
The increasing use of structural adhesives in automotive industry drives a need for material models capable of predicting the crash response of this class of materials. In this talk a material model for cohesive elements is presented which can be used in predictive simulation of the crash-response of adhesively bonded structures. Information on the calibration of this type of material model is provided. This talk also highlights differences obtained in the simulation of structural tests if rate-dependent material parameters are neglected.
Analyses with tests using human tissue materials in consideration of age-related degeneration and associated perspectives : Aiming for personalized analyses of spinal diseases
Dr. Norihiro Nishida Assistant Professor, Department of orthopedics surgery, Graduate School of Medicine, Yamaguchi University
Dr. Junji Ohgi Associate Professor, Graduate School of Medicine, Yamaguchi University
For spinal diseases caused by injuries and degeneration with major impacts on daily life, a variety of treatments have been developed, and various pathological analyses have also been performed employing the finite element method. However, we have not reached the stage of predicting outcomes preoperatively for individual patients. This is because there are many problems awaiting resolution, such as individual differences in the skeleton and age-related degeneration of human tissues. We are moving ahead with a plan for conducting analyses employing Simpleware and LS-DYNA, with the intention of using the results of the analyses of image data and material properties of human tissues obtained during surgery in patients with spinal diseases. We herein report the results and associated perspectives of these analyses.
Tips & Tricks and FAQs + Key features in the New Version
Ms. Miki Miyazaki JSOL Corporation
Dr. Rebecca Bryan Simpleware Ltd.
This session consists of two parts. For the current version of Simpleware, the practical and useful Tips & Tricks and FAQs are introduced by Miki Miyazaki, JSOL (in Japanese). For the new version, Dr. Rebecca Bryan, Technical Sales Manager of Simpleware, will showcase the key features coming in the near future (in English).
Activity in CAE for frontal constraint system in Autoliv Japan
Mr. Shuichi Osato Autoliv Japan Ltd.
Injury biomechanics study by using digital human models
Dr. Yusuke Miyazaki Associate Professor, Department of Mechanical and Environmental Engineering Tokyo Institute of Technology
Injury occurs due to disruption of the interaction between human, products and environments, whose interactions are latent in vast living environments. Furthermore, from the temporal structure of the injury, injury occurs as a consequence of human behavior, protective reaction, body motion, tissue deformation and cell damage. In order to understand the spatiotemporal structure of injuries, we have conducted integrated injury biomechanics researches regarding human behavior, protective reaction, tissue deformation and cell damage, by using human finite elemet models, realistically shaped physical models and animal models. In this presentation, we intoroduce the studies on brain injury mechanisms in traffic accidents by using finite element model of a human body and use of finite elemet model and the physical models for the cross validation.
Tendency investigation of the heat transfer coefficient by using simple driver airbag
Mr. Hirotaka Nakamura System and Simulation Engineering, General Engineering, Engineering Takata Corporation
It is an important subject to improve the validity to the performance of the airbag analysis model regarding deployment behavior and energy absorption characteristics of physical airbag, as for development of the airbag analysis model to use in the occupant protection analysis of vehicle.
The heat transfer coefficient settings to determine the heat loss characteristics are important when the energy absorption characteristics of physical airbag are simulated by the airbag analysis model.
In this presentation, the tendency investigation of the heat transfer coefficients which were calculated with focusing the difference of airbag volume is introduced. The heat transfer coefficients were calculated with the airbag analysis models which simulate the results of deployment tests with simple driver airbags.
Development and Validation of THUMS Version 5 and Application for Vehicle Safety Research
Dr. Masami Iwamoto Biomechanics Lab., Mechanical Engineering Dept. Ⅱ Toyota Central R&D Labs., Inc.
Toyota Central R&D Labs. Inc. (TCRDL) have developed a human body FE model called THUMS (Total HUman Model for Safety) with Toyota Motor Corporation (TMC) to simulate motions and injuries of human body during impacts. We have been developing the THUMS with active muscles since 2007, because there are some reports that muscle activity of occupants in pre-crash might affect occupant motions and injury outcomes during crash. TCRDL and TMC have released new version of THUMS with multiple 1D active muscles, which we call THUMS Version 5. New features of THUMS Version 5 with its validation results and its application to frontal and side impact simulations are introduced.
FE Analysis of Cyclist in Side Collisions
Dr. Koji Mizuno Professor, School of Engineering Nagoya University
Future Perspective of New Car Assessment Program and Introduction of CAE
Dr. Sadayuki Ujihashi Professor, Faculty of Engineering Nippon Bunri University
Activity of CAE cloud application in Honda and Japan Automobile Manufacturers Association
Ms. Ayumi Tada Infrastructure Technology Department Honda Motor Co., Ltd
The Operation Tips of Adopting SoftLayer onto CAE Workloads thru Customer References
Mr. Tomoari Yasuda Cloud Solution, IBM Cloud IBM Japan, Ltd.
"We have to evaluate the SoftLayer cloud as our engineering platform environment." Lots of customers say this comment in these days. In this session, I, as a cloud engineer who proposed hundreds of CAE systems, will present the summary of tips for examination process and its use case of current customers. Moreover, the latest benchmark data of LS-Dyna on SoftLayer will be unveiled including TCO data.
Engineering Design with Azure Big Compute
Mr. Kuninobu Sasaki Cloud Platform Technology Group Microsoft Japan Co., Ltd.
In industries such as automotive, consumer goods, and discrete manufacturing, engineers use simulation-driven design processes to reduce time to market. They need the ability to analyze and simulate complex high-fidelity models without having to build, manage, or maintain capital-intensive infrastructure. Azure provides HPC computing on demand, helping reduce the cost and effort needed to run massive computational models.
Utilization of LS-DYNA on PLEXUS CAE
Mr. Takeshi Numajiri Product Engineering Department, Engineering Solutions Technical Unit Ⅱ, Engineering Solutions Business Operations Information Services International-Dentsu, Ltd.
In this lecture, the outline of the cloud CAE service "PLEXUS CAE", the method of calculation executing, benchmark information, pre/post processing realized on the cloud server, and the license system provided by measured rate focused on LS-DYNA will be introduced with demonstration.
Introducing HPC "OnLine Service" that makes user to concentrate CAE
Mr. Shuichi Matsui The first manufacturing Solution Division Engineering Group NEC Solution Innovators, Ltd.
I'm going to explain the issues of utilizing HPC cloud service on CAE operations and its solutions . Also I introduce the merits of using NEC's one-stop services that includes HPC machines, CAE software, network and so other options services and I introduce our customer's issue and its solutions with their utilizing cases.
Mr. Atsuo Nakata Engineering Section Ⅲ, Enterprise Dept.Ⅰ SCSK Corporation
FOCUS supercomputer system
Dr. Takeshi Nishikawa Promotion and Research Division Foundation for Computational Science
We, Foundation for Computational Science (FOCUS), have been operating the FOCUS supercomputer in order to contribute to supporting the expansion of HPC use of step-up and industry to the supercomputer K in 2011 fiscal year.
We provide the computing resources of the supercomputer in time pay-as-you-go for the industry. A user can use the FOCUS supercomputer from the Internet paying by the elapsed time for nodes. We also offer the computing resources of the supercomputer by daily or monthly or year unit.
We started to provide the service infrastructure that is able to be fused via a VPN or a private line the cloud environment and on-premises environment from the 2015 fiscal year.
The Cloud service for CAE Engineer without ... any additional work.
Mr. Kazuyoshi Takano CEO CreDist, Inc.
Recently cloud service is getting popular for HPC environments. But, Don't you think that it is necessary to setup many things by yourself? Such as VPN connection, license server, file server, installation CAE tools, etc. If you would choose our "ILD Cloud Service", you can submit your CAE job to cloud without additional work.
LS-DYNA on Rescale - Enterprise HPC Platform
Dr. Hiraku Nakamura Rescale, Inc.
Engineering and science simulations demand an increasing amount of computing resources often constraining on-premise systems. Rescale provides a comprehensive cloud simulation platform optimized to run LS-DYNA simulations on-demand. Rescale has the largest cloud HPC network globally and supports over 120 other CAE simulation software codes.
Scaling of LS-DYNA on cloud -Availability of Linux RDMA on Azure-
Mr. Tejas Karmarkar Microsoft Corporation
The true HPC capabilities for Linux and Windows applications that RDMA enables provides our customers greater agility and helps partners deliver new services without large up-front capital investment.
LSTC and Microsoft have worked closely during the private preview and we see great scaling of LS-DYNA on Azure with both Linux and Windows RDMA. This scaling makes it possible to run many more simulations, testing different parameters.
Investigations of improvement for springback accuracy in JFE steel.
Mr. Akinobu Ishiwatari Forming Technology Research dept., Steel Research Laboratory JFE Steel Corporation
The weight reduction of the automobile is required to reduce the impact of car transportation on climate change. On the other hand, stricter collision safety regulations have been introduced in recent years than before. In order to resolve these conflicting problems, high strengths steels are applied to automotive parts. But high strength steels have large springback after press forming, and therefore the accuracy of springback prediction by FE simulations is very important. Many investigations have been carried out to improve the springback prediction accuracy at JFE Steel Corporation. In this presentation, two ideas will be discussed. One is material modeling for FE analysis which can simulate material deformation behavior exactly. The other is the handling of elastic tool deformations in FE simulations which is not considered in conventional press forming simulation with rigid tools.
Elastoplastic finite element analyses of clad-metal sheet metal forming or plate forging processes.
Prof. ManSoo Joun President MFRC Corporation
In this study, clad-metal sheet metal forming and plate forging processes are simulated using an elastoplastic finite element method. A layered mesh system generation scheme is employed to reflect the variation of state variables acrosss the thickness using multi-layer mesh system. The force prescribing die is used to apply the blanking holding force on the material. FLD approach is applied to predict the fracture ocurring on the surface of thin clad metal. The predictions are compared with experiments in terms of fracture or length, showing that they are in a good agreement with each other. Rigid-plastic finite element method is also applied to reveal the difference between the two approaches, especially for plate forging simulation.
Introduction of simulation activity in G-TEKT
Mr. Sou Suzuki R&D section R&D Division Engineering Operations G-TEKT CORPORATION
Friday, 6 November, 2015 12:40-14:20 [2-C-2 New Field Session]
Establishment of the evaluation method in the packing design use of CAE
Mr. Shutaro Mitani CAE Technology Section, Technology Development Center, Product Technology Division TOTO LTD.
Study on the Simulation of the Ultra-high Electromagnetic Field Generation
Dr. Kunio Takekoshi Engineering Division Terrabyte Co., Ltd.
The electromagnetic forming techniques have been developed to be utilized for practical purposes. In order to investigate the electromagnetic formability on complex shapes using numerical simulations, we need three dimensional thermal-structural-electromagnetic coupling analyses. Since the release of LS-DYNA version R7, the electromagnetism solver has been available in the LS-DYNA, and thermal-structural-electromagnetic coupling analyses can be carried out within LS-DYNA capabilities without any additional licenses. In this study for the establishment of simulation techniques of the electromagnetic forming simulation, the electromagnetic forming analyses are carried out to simulate behavior of electrically conductive materials in the ultra-high electromagnetic field generation experiments which have been reported by many researchers, and comparisons are made about the generation of electromagnetic flux density as well as formability of the material between experimental results and numerical results.
Development of painless needle imitating a mosquito based on biomimetics -Simulation of needle insertion by LS-DYNA-
Dr. Seiji Aoyagi Professor, Faculty of Engineering Science, Department of Mechanical Engineering Kansai University
We have been developing a low invasive microneedle by imitating the shape of mosquito proboscis and the motion of its insertion. The mosquito proboscis consists of plural finely thin needles. The inserting motion was observed using a high speed camera system. It was proven that a central labrum inside which blood is drawn up and two maxillae aside the labrum, i.e., totally three needles, gradually progress inside the skin, while they move alternatively with certain phases to each other.
We are challenging the problem to clear the mechanism both theoretically and experimentally how the cooperative motion of three needle eases the insertion. To analyze the non-linear phenomenon of needle insertion to skin, explicit FEM simulation using LS-DYNA is ongoing. A precise 3D CAD model of mosquito was constructed. Using this model, we have already succeeded in confirming that resistance force during insertion is reduced with applying vibration.
Recently, CAE model size becomes larger and larger. It is for accurate analysis, but on the other hand, it is one of the factor which lowers the productivity.
Therefore the reduction of computing time is very important in performing a task.
We often use a parallel computing to reduce computing time. However, the efficiency we expected isn't obtained in some models.
So in this presentation, we introduce efficient speed-up technique according to the various problems.
Advanced use of elements in LS-DYNA
Mr. Norio Shimizu JSOL Corporation
In the structural simulation, elements are one of the key factors to secure the accuracy of a simulation.
LS-DYNA supports a series of elements that are commonly used in the structural simulation: solid, shell, beam, etc. Element formulations including EFG, SPH, and mesh-free are also covered. This variety in element types allows users choose the elements suited to the phenomenon the user tries to simulate.
This session provides a brief summary and feature overview of the elements implemented in LS-DYNA, along with their general applications.
Some of the new features relate to elements will be introduced with examples.
In recent years, needs for adhesive bonding is increasing due to demands on connecting different type of materials. Modeling of mechanical property including damage and failure with CAE is the key for rapid product development.
Modeling techniques of structural adhesive for LS-DYNA is introduced with examples.
Material Failure Modelling of LS-DYNA
Mr. Kei Saito JSOL Corporation
Failure of deformed material strongly affects the results of analysis. For this reason, various methods for material failure have been proposed. While these models could reproduce the failure initiation successfully, there are still many problem to be resolved, dependency of discretization and orientation of mesh, for practical use of failure model. To overcome these problems, several new features has been developed and implemented in LS-DYNA. In this presentation, failure modellings and the status of new features in LS-DYNA will be introduced.
Friday, 6 November, 2015 14:50-16:55 [2-K-1 General Session 2]
[Special Speech] New insights into materials and structures using state-of-the art measurement technology
Dr. Michael May Head of Department Dynamics in Microstructures Fraunhofer EMI
Over the last decade, significant improvements in computational power and choice of material models have resulted in big leaps in crash simulation. On the other hand, basic material testing is - and will always be a necessity - for generating input for the numerical simulation. Additionally, physical crash tests are also required for validation of the models. Therefore, engineers are usually interested in information such as rate- and temperature dependent material behavior, deformation during test, damage and failure, ... This talk gives some insight into recent and currently ongoing developments in material and structural testing. Special attention is given to optical deformation measurements, X-ray imaging, and high-rate testing.
[Keynote Speech] The development of Crash Safety Performance on New MX-5 Miata
Mr. Masaki Ueno Manager Crash Safty Techonology, Crash Safety Development Dept. Mazda Motor Co.
As a symbol of Mazda brand, MX-5 Miata must embody Mazda-like driving pleasure -"Jinbaittai". In the development of the 4th generation MX-5 "ND", reducing the weight to less than 1 ton equivalent to the 1st generation "NA" and downsizing the framework to achieve the brand design theme "KODO" were the major technological challenges. In order for customers to enjoy the high dynamics performance at ease, the Crash Safety Development Dept. had to solve the aforementioned challenges without sacrificing the crashworthiness. By utilizing cutting-edge CAE technologies including LS-DYNA for the design of basic body framework, optimal function allocation, adoption of light-weight aluminum materials, and what we call "Gram Strategy", thorough elimination of structural waste, the light weight target and downsized body have been achieved. The contents of those technologies are explained in the presentation.
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