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8th European LS-DYNA Conference

Integrating plastics molding and structure dynamics analysis by leveraging LS-DYNA, MOLDEX3D and PRESYS
Allen Y. Peng, Emily Wu, C.T. Huang - CoreTech System (Moldex3D) Co.
An increasing number of automotive or consumer electronics parts are made of engineering plastic for its low cost and superior material properties. The traditional structure analysis for injection-molded plastics part is to perform CAE analysis based on the assumption of one or several isotropic materials. However, the material characteristic of plastic part is extremely dependent on molding process. The process-induced properties, ...
Investigation and Application of Multi-Disciplinary Optimization for Automotive Body-in-White Development
Allen Sheldon, Edward Helwig - Honda R&D Americas
Yong-Bae Cho - CSM Software
A process has been created for applying multi-disciplinary optimization (MDO) during the development of an automotive body-in-white (BIW) structure. The initial phase evaluated the performance of several different optimization algorithms when applied to structural MDO problems. From this testing, two algorithms were chosen for further study, one of these being sequential metamodeling with domain reduction (SRSM) found within LS-OPT. To use ...
Investigation of Failure Criterion in Dynamic Torsion Tests with Solid Cylindrical Specimens
Pavel A. Mossakovsky, Fedor K. Antonov, Lilia A. Kostyreva - Moscow State University
When investigating the limiting states of materials under dynamic loading conditions, it’s important to specify the dependency of plastic failure strain on the stress state. Usually, such dependence is build upon the experimental data obtained from dynamic tests in tension and compression of solid cylindrical specimens with different working part geometry, followed by a monotonic extrapolation. In the recent studies [1] the existence of ...
LS-DYNA application to develop a package for air transportation of fissile materials
A.V. Abramov, O.V. Voykina, E. Yu. Emelyanova, D. Yu. Karpov, I. A. Kochura, I.V. Minaev - Zababakhin FSUE RFNC-VNIITF
Object of computer study is a package for FM storage and transportation based on a container AT-400R [1]. Shock and fire resistant container AT-400R was designed at Sandia National Laboratories (USA) and was tested by US and Russian specialists in compliance with the IAEA regulations [2], including cases of flooding, falling of a slab with mass 500 kg from the height of 9 m, container dropping from the height of 1 m onto the pin 150 mm in ...
Material Data Determination and Crash Simulation of Fiber Reinforced Plastic Components
Florian Becker - German Institute for Polymers (DKI
Stefan Kolling - Institute of Materials and Applied Mechanics, THM
Julian Schöpfer - Daimler AG
The quality of the mechanical simulation of reinforced thermoplastics depends on very com­ plex input parameters regarding the complex material behaviour. At the beginning of the sim­ ulation chain the material data has to be determined in different mechanical tests (tension, compression and shear, different fibre orientation to load direction, etc.). After the injection moulding simulation the calculated fibre orientation has to be mapped ...
Mechanical Characterization of Talc Particle Filled Thermoplastics
Frank Kunkel, Florian Becker - German Institute for Polymers (DKI)
Stefan Kolling - THM
In this paper, we present the experimental part of the development for an integrative simulation with Moldex3D and LS-DYNA for talc particle lled polypropylene. The properties of thermoplastic polymers considerably depend on the process of moulding irre- spective of the geometry of the part and the raw polymer used. Both, the polymer structure resulting from moulding and formation of weld lines may show a large inuence on ...
Modeling of Cone Penetration Test Using SPH and MM-ALE Approaches
Ronald F. Kulak, Cezary Bojanowski - Argonne National Laboratory
The American Society of Association Executives (ASAE) Soil Cone Penetrometer Standard (S313.2) is designed to characterize general soil mechanical conditions. Its results are used predominantly for comparative purposes. Variations of this test are used for in-situ determination of the geotechnical engineering properties of soils and delineating soil stratigraphy. This paper presents a comparison between experimentally obtained results of ...
MPP Execution of Implicit Mechanics with 10M or More Elements
Dr. C. Cleve Ashcraft, Roger G. Grimes, and Dr. Robert F. Lucas - LSTC
LS-DYNA models for Implicit Mechanics are getting larger and more complex. We are continually seeing models where the linear algebra problems in Implicit Mechanics have 3 to 5 million elements and know of at least one that is nearly 30M elements. It is these very large linear algebra problems that distinguish the computer requirements for Implicit Mechanics. This paper will present a study of the performance of the MPP implementation of ...
Multi-scale Approach for CFRP Composite Simulation by JSTAMP/NV and DIGIMAT
Noriyo Ichinose - JSOL Corporation
 
Numerical Simulation of Consequences of Passenger Aircraft Tyre Damage
Dr. Alexander Ryabov , Dr. Vladimir Romanov , Sergey S. Kukanov , Dr. Andrey Kudryavtsev , Anatoliy Botvinkin - Sarov Engineering Center
Maxim Litvinov , Vladislav Gubin , Dmitry Egorov - CJSC Sukhoi Civil Aircrafts
All new-designed passenger aircrafts have to meet strict national and international safety requirements in accidents. One of the accidents is pneumatic tyre failure (a tyre burst). Because of that the tyre can be fragmented. An air stream from the tyre and some tyre pieces under the air stream can impact on vitally important aircraft system elements in the landing gear box and disable or break them. In this case a designer has to provide a ...
Numerical simulation of spiral-strand cables subjected to high velocity fragment impact
R. Judge, Z. Yang, S.W. Jones - University of Liverpool
G. Beattie - Arup
This paper presents the results of a numerical study carried out to evaluate the response of high-strength steel spiral-strand cables, when subjected to high velocity fragment impact. A detailed numerical model of a 60 mm diameter spiral-strand cable subjected to impact from a 20 mm fragment simulating projectile has been developed for analysis in LS-DYNA. Detailed consideration was given to the complex geometry of the cable, wire-to-wire ...
Numerical Simulation of the Ice-Structure Interaction in LS-DYNA
Hamid Daiyan and Bjørnar Sand - Northern Research Institute (NORUT Narvik)
Design of offshore structures in Arctic waters is strongly dependent on local and global ice loads. These loadings are, in general, contact forces transmitted to the structures during interaction with ice floes, ice ridges or icebergs. The prediction of ice forces on structures relies heavily on a thorough understanding of mechanical behavior of sea ice as well as on in-depth knowledge of interaction between ice features and ...
ODB-10M New Topcrunch Benchmark Data
Mitsuhiro Makino and Shota Yamada - DYNAPOWER corp
New Benchmark model ODB-10M is 10 million elements model, which consist of refined NCAC Taurus model and LSTC shell ODB barrier model. Refined NCAC Taurus model is 9 million elements of type16 shell elements and type2 solid elements, and *CONSTRAINED_SPOTWELD is changed to *CONTACT_SPOTWELD with beam. In LSTC shell barrier, type10 shell element is changed to type16 shell element in order to avoid negative hourglass energy. We also discuss ...
On Fracture Criterion of Titanium Alloy under Dynamic Loading Conditions
Pavel A. Mossakovsky, Fedor K. Antonov - Moscow State University
Anatoly M. Bragov, Alexander Yu. Konstantinov - State University of Nizhni Novgorod
Mikhail E. Kolotnikov, Lilia A. Kostyreva - FSUE "Gas Turbine Engineering Researh and Production Center-Salut"
One of the most important factors in ensuring the adequacy of the mathematical modeling of limiting states of structures is the choice of the material local fracture criterion and accurate determination of its parameters. The paper discusses some traditional approaches to the construction of local failure criteria of metals under dynamic loading, methods of their parameters identification, as well as the development of these approaches on ...
Optimizing Thermoplastic Parts in Crash Applications - Status and Vision
Andreas Wüst, Dr. Stefan Glaser – BASF SE
Dr. Steffen Frik - Opel AG
 
Orion space craft water and land landing system simulation; An injury case study
Ala Tabiei - The University of Cincinnati
Chuck Lawrence - NASA Glenn Research Center
NASA’s return to moon program had kept the NESC (NASA Engineering and Safety Center) busy for the past several years. The NESC was charged to come up with a safe landing for the Orion capsule. Water and land landing is considered for the Orion capsule. The NESC took major initiative to come up with recommendation to the program. Part of this initiative is to come up with Injury criteria recommendation during the landing of the Orion ...
Parametric Modelling of Simplified Car Models for Assessment of Frontal Impact Compatibility
Mathias Stein, Darius Friedemann, Alexander Eisenach, Heiko Johannsen - Technische Universität Berlin
Hans Zimmer - SFE GmbH
The aim of the FIMCAR project (co-funded by the European Commission within the 7th Framework Programme) is to develop and validate a frontal impact assessment approach that considers self and partner protection. In order to assess the influence of different test procedures and metrics on car- to-car compatibility a huge simulation programme is envisaged. However, car-to-car simulations with models of different car manufacturers are almost ...
Performance Benefits of NVIDIA GPUs for LS-DYNA
Stan Posey, Srinivas Kodiyalam - NVIDIA Corporation
This work examines the performance characteristics of LS-DYNA for the latest CPU and GPU technologies available. The results are provided for system configurations of workstations for finite element models that are relevant to current industry practice. The motivation for these studies was to quantify the parallel performance benefits of LS-DYNA for the latest generation GPU from NVIDIA, the Tesla 20-series (codenamed Fermi) for implicit ...
Performance of Large Scale Implicit Crash Analysis on Multicore Processor Systems
Yih-Yih Lin, PhD
 
Phenomenological driven Modeling of Joints
Matthias Bier, Herbert Klamser - Dr. Ing. h.c. F. Porsche AG
Andre Haufe DYNAmore GmbH
In the construction of automobiles different technologies are used to join sheets. Today the most common method for connections is resistant spot welding. There are thousands of spot welds in body-in-whites, which are determining the behavior of the structure under crash conditions. New research is striving after replacing these thermal joints by adhesives or rivets for optimization of the production process. It is essential to ensure a cost ...
Prediction of failure on high strength steel in seat mechanisms simulation
M. CHAUFFRAY, G. DELATTRE, L. GUERIN - Faurecia Automotive seating
Tracks are the mechanisms which enable to translate the seat; they are key contributors in occupant safety as link between seat and car. With the current evolution of ecologic legislation, one of major automotive industry priorities is to decrease the product mass. To reach this objective, the use of high strength steels appears as a good solution with the drawback to be more brittle. In parallel, FEA models have to be more and more ...
Prediction of structural response of FRP composites for conceptual design of vehicles under impact loading
Sivakumara, K. Krishnamoorthy, Johannes Höptner, Gundolf Kopp, Prof. Dr.-Ing. H.E. Friedrich - German Aerospace Center (DLR e.V.)
For the predictability of composite material behaviour under highly dynamic loads like crash, there is a need for better models reproducing the exact physics of failure mechanisms (matrix cracking, delamination, heat dissipation etc.). This belongs to the state-of-the-art research topics in numerical modelling. The conceptual design of vehicle structures however requires a qualitative understanding of the load-displacement characteristics, ...
Process development for multi-disciplinary spot weld optimization with CAX-LOCO, LS-OPT and ANSA
Dr. Gordon Geißler - DYNAmore GmbH
Thomas Hahn - Audi AG
The number of connection entities in modern car constructions is growing continuously. From that point of view, the identification of the most suitable structural behaviour of various car body configurations with respect to the number and the arrangement of connections becomes a challenge in automotive development. A standard simulation and optimization process was developed and established in a common project with the Audi AG and DYNAmore ...
Progress on GPU Implementation for LS-DYNA Implicit Mechanics
Roger G. Grimes, Dr. Robert F. Lucas, and Gene Wagenbreth - Livermore Software Technology Corporation
Graphics processing units (GPUs) are ubiquitous devices designed to improve the end-user experience in mass market arenas such as gaming. High-end GPUs have an order of magnitude more computing power than their hosts, and are thus attractive candidates for accelerating compute bound applications such as MCAE. This talk will present how we have extended LS-DYNA to utilize Nvidia Tesla GPUs for implicit mechanics. We will describe the target ...
Qualification of *Constrained_Lagrange_In_Solid command for steel/concrete interface modeling
L. MOUTOUSSAMY, G. HERVE, F. BARBIER - Tractebel Engineering France
Modeling reinforced concrete is an important requirement for civil engineering calculation. Particularly, engineers need to have information about both rebar and concrete. The need for modeling them separately comes obviously to allow local and global analysis of a reinforced concrete structure. This paper focuses on the validation of modeling of reinforced concrete with the CSCM material and Constrained Lagrange In Solid to tie the rebar. ...
Recent Enhancements to the GISSMO Failure Model in LS-DYNA
André Haufe - DYNAmore GmbH
Markus Feucht, Frieder Neukamm - Daimler AG
Paul DuBois - Consultant
 
Roof Crush Resistance and Rollover Strength of a Paratransit Bus
Cezary Bojanowski Transportation Research and Analysis Computing Center, Argonne National Laboratory
Bronislaw Gepner, Christopher Rawl, Jerry Wekezer - FAMU-FSU College of Engineering
Leslaw Kwasniewski - Warsaw University of Technology, Faculty of Civil Engineering
Paratransit buses constitute a special group of vehicles in the US due to their smaller size, two-step assembly process, and their use for complementary services to the regular scheduled transit routes. Due to their uniqueness these buses lack national crashworthiness standards specifically dedicated to the paratransit fleet. Several states in the US adopted the quasi-static symmetric roof loading procedure according to the standard FMVSS 220 ...
Session7_Paper2_Abstract.pdf
 
Shock Wave Effect on Aluminium Foam
M. Vesenjak, M. Borovinšek, Z. Ren - University of Maribor, Slovenia
S. Irie - Kumamoto University
S. Itoh - Okinawa National College of Technology
The behaviour of aluminium foam under impact loading conditions and especially the shock wave propagation are still not well understood. The shock wave propagation through the cellular material structure under impact loading conditions has a significant effect on its deformation mechanism and therefore it is imperative to understand its effects thoroughly. The goal of this research was to investigate and examine the effects of shock ...
Simulation of charge and structural behaviour in an tumbling mill
Pär Jonsén, Hans-Åke Häggblad, Bertil I. Pålsson - Luleå University of Technology
Kent Tano - LKAB
Andreas Berggren - Boliden Minerals
For a long time discrete element methods (DEM) has been used as simulation tools to gain insight into particulate flow processes. Such a process may be grinding in tumbling mills, where the mechanical behaviour is complex. To include all phenomena that occur in a mill in a single numerical model is today not possible. Therefore, a common approach is to model milling charges using the DEM assuming a rigid mill structure. To close the gap ...
Simulation of ice action loads on off shore structures
Dr. Daniel Hilding , Dr. Jimmy Forsberg - Engineering Research Nordic AB
Dr. Arne Gürtner - Statoil ASA
During the last years, there has been an increasing amount of work published regarding simulation of ice action on structures using finite element models of the ice. The effect of ice fracture is in these models approximated using cohesive elements. In this article we give an overview of the cohesive element method for ice modelling including recent improvements made by the authors. A description is given of the implementation of the ...
Simulation of shock absorbers behavior during a 9m drop test
Fabien Collin - TN International
TN International designs, manufactures and licenses packages for the transportation of radioactive materials. To justify the leaktightness and then insure the safety of a package during an accident event, a 9m drop test onto an unyielding target has to be considered. The corresponding kinetic energy is generally absorbed by shock absorbers filled with wooden blocks. In order to improve the numerical simulation of those shock absorbers, a ...
Simulation of Shock Wave Mitigation in Granular Materials by Pressure and Impulse Characterization
C. Guéders, J. Van Roey, J. Gallant, F. Coghe - Royal Military Academy, Brussels
The detonation of an explosive charge has two major effects, blast wave generation and fragmentation. New technologies of energy dissipation, based on granular materials, seem to have good shock attenuation capabilities. Plastic deformation, brittle fracture and comminution are different mechanisms of dissipation which can take place in granular media, allowing blast energy absorption and reduction of dynamic solicitation applied on ...
Statistical Analysis of Process Chains : Novel PRO-CHAIN Components
Daniela Steffes-lai. Tanja Clees - Fraunhofer Institute for Algorithms and Scientific Computing SCAI
The robustness of production processes and the quality of resulting products suffer from variations in important material and process parameters, geometry and external influences, which can have substantial and critical influences. Therefore these variations have to be analyzed and transferred over process steps in order to achieve considerably better forecasting quality. We developed the PRO-CHAIN strategy for statistical analysis of ...
The ACP Process Applied to the FutureSteelVehicle Project: The Future of Product Design and Development
Akbar Farahani, Paul Dolan, Hamed Sharifi - ETA Inc.
Jody Shaw - U. S. Steel
Marc Lambriks - Tata Steel
WorldAutoSteel launched Phase 2 of its FutureSteelVehicle programme (FSV) with the aim to help automakers optimise steel body structures for electrified vehicles. The Phase 2 objective is to develop detailed design concepts and fully optimise a radically different body structure for a compact Battery Electric Vehicle (BEV) in production in the 2015-2020 timeframe. This paper will provide an overview of the product design methodology and how ...
The Effect of MPI Collective Operations and MPI Collective Offloads on LS-DYNA Performance
Gilad Shainer, Tong Liu, Pak Lui - Mellanox Technologies
Dave Field - Hewlett-Packard
From concept to engineering, and from design to test and manufacturing, the automotive industry relies on powerful virtual development solutions. CFD and crash simulations are performed in an effort to secure quality and accelerate the development process. The recent trends in cluster environments, such as multi-core CPUs, GPUs, cluster file systems and new interconnect speeds and offloading capabilities are changing the dynamics of ...
The RHT concrete model in LS-DYNA
Dr. Thomas Borrvall - Engineering Research Nordic AB
Dr. Werner Riedel - Fraunhofer Institut fur Kurzzeitdynamik
The RHT concrete model is implemented in LS-DYNA. It is a macro-scale material model that incorporates features that are necessary for a correct dynamic strength description of concrete at impact relevant strain rates and pressures. The shear strength of the model is described by means of three limit surfaces; the inelastic yield surface, the failure surface and the residual surface, all dependent on the pressure. The post-yield and ...
The use of different CSF representations in a numerical head model and their effect on the results of FE head impact analyses
K. Baeck, J. Vander Sloten, J. Goffin - K.U.Leuven
To gain better insight in the mechanopathogenesis of brain and skull lesions and to improve the design of protective devices like helmets, finite element (FE) head models are used. Current FE head models have a detailed geometrical description of the anatomical components of the head but often lack an accurate description of the behavior of the cerebrospinal fluid (CSF). Different material properties, mesh resolutions and numerical ...
The use of Generic Entities for Multidisciplinary preprocessing. A simple but powerful pattern in ANSA
Yianni Kolokythas, Lambros Rorris - BETA CAE
Today’s multidisciplinary CAE environment demands for rapid FE Model development cycles, thus the efficient processing of repetitive and complex modeling tasks is vital. This creates a need for highly automated processing steps and effective data sharing between the different CAE disciplines. BETA CAE Systems SA, in order to meet the above requirement, came up with a series of technologies, integrated within its preprocessor ANSA. These ...
The Winfrith Concrete Model : Beauty or Beast ? Insights into the Winfrith Concrete Model
Len Schwer - Schwer Engineering & Consulting Services
The so called Winfrith concrete model in LS-DYNA (MAT084 and MAT085) provides: • A basic plasticity model that includes the third stress invariant for consistently treating both triaxial compression and triaxial extension, e.g. Mohr-Coulomb like behavior, • Uses radial return which omits material dilation, and thus violates Drucker’s Postulate for a stable material, • Includes strain softening in tension with an attempt at regularization ...
Topology Design using LS-TaSCTM Version 2 and LS-DYNA
Willem Roux - Livermore Software Technology Corporation
This paper gives an overview of LS-TaSC version 2, a topology optimization tool using LS-DYNA for the analysis of nonlinear structural behavior. The focus is on its capabilities, current development directions, and integration into an industrial design environment. Examples of using the new developments such as global constraints, geometric definitions such as symmetry and casting directions, and shells are given.
Usage of fully detailed CAE models for concept design with the ANSA Morphing Tool
George Korbetis - BETA CAE
During the concept phase of product development, simplified CAD and CAE models are used to retain model versatility and minimize the set up time and the analysis complexity. However, this process often leads to simplified calculations with inaccurate results diverting from a realistic solution. Additionally, considerable time is spent to convert the simplified CAE models to full detailed ones at a later stage. This paper describes a ...
User-Defined Nonlocal Models in LS-DYNA
F.X.C. Andrade, J.M.A. Cesar de Sa , F.M. Andrade Pires - University of Porto
M. Vogler - Leibniz Universität Hannover
In this paper, we present an implementation technique that aims to easily incor- porate the benefits of a nonlocal formulation to existing local constitutive models. In order to avoid pathological mesh dependency, an approximation of the nonlocal strategy is adopted. The technique is designed in such manner that the nonlocal extension of previously existing local models is carried out straightforwardly, requiring only minor modifications in ...
Using CAE to evalute a structural foam design for increasing roof strength
Sameer Gupta - Honda R&D
In recent years, there has been increased discussion of the strength of vehicle roofs in rollover crashes. NHTSA recently revised the federal roof strength requirement and the IIHS has published an even more stringent roof strength goal. While working to increase roof strength, automakers are also working to reduce vehicle mass for improved fuel economy and other benefits. Developing technology to achieve both of these goals is challenging. ...
Using LS-DYNA MM-ALE capabilities to help design a wall mitigating accidental blast effects
Julien Lacambre, Laurent Delmas - Alyotech TS&I
A solution had to be found in order to protect buildings neighboring an industrial site from the blast effects of possible accidental explosions on the site. One of the main issues was that the point of detonation would occur relatively close to the endangered buildings. A possible answer was to build a blast-mitigating wall between the buildings and possible blasts. The MM-ALE features of LS-DYNA provided a way to evaluate the effects of ...
Using LS-OPT for meta-model based global sensitivity analysis
Uwe Reuter, Zeeshan Mehmood, Clemens Gebhardt - TU Dresden
Martin Liebscher, Heiner Müllerschön, Ingolf Lepenies - DYNAmore GmbH
Popular sensitivity analysis methods such as ANOVA and SOBOL indices are widely used in LS-OPT in order to measure the importance of different input variables with respect to the model response. These methods are applied using meta-models in LS-OPT. In contrast, sensitivity information can be directly extracted from the meta-models using weight-based and derivative-based approaches. Meta-models capture the non-linear relationship of the ...
Validation and Material Modelling of Plastics
A. Haufe , V. Effinger - DYNAmore GmbH
P. Reithofer , M. Rollant , M. Fritz - 4a engineering GmbH
The virtual estimation of physical product properties is only as good as the virtual description of the behaviour of its material. On the one hand there are well known material cards like *MAT_PIECEWISE_LINEAR_PLASTICITY in LS-DYNA© developed to describe a simplified behaviour of metallic materials. The reduced complexity of these material cards makes it possible to determine its parameters with less effort in actual material testing. Main ...
Warm Forming Simulation of 7075 Aluminium Alloy Tubes Using LS-DYNA
G. D’Amours, J.F. Béland - National Research Council Canada
The demand for lightweight tubular products, designed specifically for transportation and recreational applications, is currently on the rise. In general, performance increase and energy cost reduction are the main reasons justifying the need for these specialty products. Hence, to reach these goals, both industries are turning to complex-shaped tubes for various types of applications. However, high performance aluminium tubes, such as 7075 ...
Wood-steel structure for vehicle restraint systems
C. Goubel, M. Massenzio, S. Ronel - Université de Lyon
Certain roadside safety barriers are structures made of steel and wood. This kind of structure is currently in fashion in location where the safety equipments need to be discreet (mountains, countryside). In Europe, to be installed on the roadside, the vehicle restraint systems have to pass two crash tests, as defined in the European standard EN1317. Our aim is to develop a dynamic model of the multi material structure in order to ...