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11th European LS-DYNA Conference

Salzburg, 2017

Numerical Evaluation of Low-Speed Impact Behaviour of a Fabric Layered Composite Plate in an Industrial Context
S. Treutenaere, F. Lauro, B. Bennani, G. Haugou, W. Xu (University of Valenciennes); E. Mottola, T. Matsumoto (Toyota)
The use of Layered Fabric Reinforced Polymers (LFabRP) in the automotive industry is growing significantly. In order to ensure the safety and design imperatives, a new material model was developed for the LFabRP to improve the predictability of low-speed impact simulations by means of Finite Element Analysis (FEA). The delamination prediction with FEA requires costly computation time methods such as the use of cohesive elements at ply ...
Numerical Investigations of Adhesive CFRP-Joints and Determination of Transverse Properties of the Adherends
T. Behling, M. Holzapfel (DLR)
Within the DLR (German Aerospace Center) project “Next Generation Car” adhesive joints of carbon fiber reinforced polymers (CFRP) are investigated. The focus was set on a numerical model to predict the failure mode (surface ply failure, delamination or adhesive failure) depending on the stacking sequence of the laminate. In a first step, the ‘five-point bending’ test was evaluated and chosen to measure the out-of-plane shear strength of a woven ...
Numerical Investigations on Ricochet of a Spin-Stabilised Projectile on Armour Steel Plates
M. Seidl, T. Wolf, R. Nuesing (ISL)
Expanding urbanisation poses new challenges. Developing countries are facing a rapid Urbanisation with an estimated 4.3 billion urban inhabitants by 2035 [1]. History has shown that conflict and large-scale disasters are likely to occur where large populations reside [2]. During peace-keeping missions, soldiers move in closed urban locations surrounded by house walls and close to their armoured vehicles. In event of combat, the likelihood of ...
Numerical Model to Predict Kickback for Angle Grinders
G. Fleury (INRS)
Angle grinders are powertools used widely by companies and craftsmen for grinding and cutting applications. The operator must comply with the correct operating procedures and conditions, including the choice of an appropriate tool (cutting disc, grinding wheel, backing pad or brush), to ensure his safety. Even so, some working conditions can cause the rotating tool to be either pinched or snagged. As the rotational kinetic energy of the wheel ...
Numerical Modeling of Concrete Response to High Strain Rate Loadings
R. Sharath, D. Arumugam, B. Dhanasekaran, T. Subash (Larsen & Toubro)
The dynamic characterization of concrete is fundamental to understand the material behavior in case of earthquakes and extreme dynamic events like Blast and impact. Extensive research is available on the study of quasi-static or nearly static behavior of concrete, but limited investigations/research exists on the prediction of dynamic response, especially under high strain loadings. Numerous material models are available for modeling the dynamic ...
Numerical Modelling of Symmetric and Asymmetric Punching and Post-Punching Shear Responses of RC Flat Slab
N. Ulaeto, J. Sagaseta (University of Surrey)
The design and construction of civil engineering structures take into great consideration the sensitivity of such structures in the event of local failures. Flat slab structural systems are very prone to progressive collapse after the failure of a connection or column. Hence, to improve their robustness the introduction of integrity reinforcement is recommended in Eurocode 2, ACI 318-11 and Model Code 2010. However, very little investigation ...
Numerical Modelling of the Fluid Structure Interaction using ALE and SPH: The Hydrodynamic Ram Phenomenon
D. Varas, J.A. Artero-Guerrero, J. Pernas-Sánchez (University Carlos III of Madrid)
Vulnerability against high-velocity impact loads is a critical issue for the design of aerospace structures due to the fact that aircrafts can be subjected to different types of loads during their service life which may cause a catastrophic failure. Bird strikes, hailstones, runway debris or even the ice released from the edge of a propeller blade may impact different parts of the fuselage. Wings represent the largest exposed area to impact ...
Numerical Modelling of the Plastic Deformation of Ti-6AI-4V Sheets Under Explosive Loading
D. Kakogiannis, F. Coghe, L. Rabet (Royal Military Academy)
The subject discussed in the present paper is the numerical modelling conducted during the design process of an experimental setup that is used to investigate the response of circular Ti6Al4V sheets under impulsive loading. A multiscale numerical modelling method to predict the plastic deformation of the material is presented focusing on the definition of the parameters of the Cazacu-Barlat model (*MAT_233/*MAT_CAZACU_BARLAT) as implemented in ...
Numerical Prediction of the Dynamic Response of Prestressed and Reinforced concrete Hollow Core Slabs Under Blast Loading
A. Maazoun, S.Matthys (Ghent University); J.Vantomme (Royal Miliatry Academy)
This paper investigates the use and accuracy of finite element simulations by means of LS-DYNA of reinforced concrete hollow core slabs with a compression layer, simply supported and subjected to blast loading. The aim of this paper is to explain how to develop a numerical model, in order to predict the maximum deflection and crack distribution. Parametric studies related to hourglass energy, erosion value and the material model of the ...
Numerical Simulation of High-Speed Joining
M. Gerkens, Prof. G. Meschut (Universität Paderborn)
The increasing trend of multi-material and space-frame design in automotive car body construction consolidates the need for mechanical joining technologies with one-sided accessibility. The high-speed joining (also called “RIVTAC®” or “Impact”) is an innovative and flexible technology. A tack with a profiled shank and an ogival shaped tip is pushed into the joining partners with a speed of 20 to 40 m/s without pre-punching. The plastic and ...
Numerical Study of the High Velocity Impact Response of Vehicle Armor Combination Using LS DYNA
G. Başaran (FNSS Savunma Sistemleri)
The aim of this work is to perceive if the outcome from a ballistic impact can be predicted beforehand with the help of material testing and finite element simulations. Use of refined numerical simulation are gaining more importance especially in extreme load cases. A numerical investigation of the ballistic performance of monolithic, double layered metallic plates made of either steel or aluminium or combinations ,were impacted by a 7.62-mm ...
On Demand Licensing with LS-DYNA
U. Göhner (DYNAmore)
The LS-DYNA simulation software is used on different High-Performance-Computing platforms since many years. Most of the users have access to in-house Cluster systems running LS-DYNA in the MPP-version on up to several 100s of Cores and an appropriate number of licenses to use their hardware effectively [1]. In recent years there was increasing demand inside the LS-DYNA user base for a flexible and efficient offering of software licenses both for ...
On the Influence of Shell Element Properties on the Response of Car Model in Crash Test
S. Burzyński, K. Wilde, D. Bruski, J. Chróścielewski (Gdańsk University of Technology)
In this report we address the issue of selection of control card values and its influence on the behavior of the Ls-Dyna car model in collision test. It is shown that the shear factor coefficient plays substantial role on the overall course of the simulated event.
Orbital Forming of SKF's Hub Bearing Units
E. Omerspahic; J. Facht (SKF)
Orbital forming is an incremental cold forming process that can be used to shape materials such as metals with much lower forming loads compared to pressing. The orbiting tool rotates at a fixed angle to the machine axis and applies both pressure and orbital motion to progressively shaped material. Because the tool is nutating and not rotating, minimal friction is obtained between the workpiece and tool. In SKF, orbital forming is used by SKF ...
Physical Appearance Evaluation of Automotive Seat Structre with J-SEATdesigner
N. Ichinose, H. Yagi (JSOL)
Seat styling is one of the important factors for automotive interior design. Automotive OEM company specifies 3D design to the seat supplier or their seat design section and the seat supplier designs 2d pattern to achieve desired 3D design as possible. To design the pattern from 3D seat design require a lot of experience, in many company, limited number of specialist can design the pattern based on their experience. These companies strongly ...
Plastic Instability of Rate-Dependent Materials - A Theoretical Approach in Comparison to FE Analyses
C. Keller, U. Herbrich (Bundesanstalt für Materialforschung und –prüfung)
In FE simulations of dynamic events, the accuracy of numerical results strongly depends on the quality of the material models and parameters used. Material characteristics identified in static tests are not suitable or are of limited suitability for the description of the deformation behaviour of components and structures under dynamic loading. On this account, it is neces-sary to determine material properties in dynamic tests and to provide ...
Preliminary Study on Modeling of the Deformation and Thermal Behavior of FSW using SPH Approach
S. Patil, H. Lankarani (Wichita State University); F. Baratzadehl (National Institute for Aviation Research)
Material flow in the solid-state Friction Stir Welding (FSW) is quite a complex process. Investigation of material flow can be carried out either by experimentation or by numerical simulation. However, compared to experimentation, numerical simulation is inexpensive, efficient and convenient, but quite challenging to model. The challenging issue in modeling FSW is to deal with the large deformations of the workpiece material. The Lagrangian ...
Process chain simulation for “Die-Less-Hydroforming” including Welding and Forming using “DynaWeld” and “LS-DYNA
A. Metzger, T. Ummenhofer (Karlsruher Institut für Technologie)
Within the scope of “Die-Less-Hydroforming”, two or more thin metal blanks are joined at their edges by seal-welding. Thus, a two-dimensional flat “envelope” made of steel sheet results, that is formed into spatial structure through inflation of a medium (e.g. water) under continuous pressure increase. In comparison to conventional hydroforming-processes, no additional forming tool like a die or mould is used, leading to special phenomena like ...
Processor Count Independent Results: Challenges and Progress
B. Wainscott, Z. Han (LSTC)
When a different number of cores is used to run the same model in MPPDYNA, different results are generally produced. We discuss a couple of different reasons for this, and why it is to be expected in a parallel program. Work is in progress to offer options which work around this issue, and results of some test problems are presented.
Recent Developments for Frequency Domain Analysis in LS-DYNA
Y. Huang, Z. Cui (LSTC)
Since the 971 R6 version, a series of frequency domain features have been implemented to LS-DYNA. They include FRF, SSD, random vibration, acoustics, response spectrum analysis and fatigue analysis. With the implementation of these features, the application of LS-DYNA is extended to the new area of frequency domain analysis. Some new developments and updates have been made for the frequency domain features, since the last European LS-DYNA ...
Reduced Ductility due to Local Variation in Material Properties for 3D-Printed Components
T. Tryland (Sintef Raufoss Manufacturing)
It is often useful to have a physical model to display geometry as an alternative to the 3D-model on a computer screen. In addition, 3D-printed components may work well to evaluate the assembly process. The question here is whether parts that are manufactured in this way have representative ductility to give valuable results in structural tests where the material is loaded outside the elastic regime. There is a wide range of processes and ...
Resistive Spot Welding Simulations Using LS-DYNA
P. L'Eplattenier, I. Caldichoury (LSTC); T. Loose (DynaWeld)
Resistance Spot Welding (RSW) is a very important welding process for thin sheet metals with many applications, in particular in the automotive industry. In this method, the contacting metal surfaces are joined by the heat obtained by Joule heating of an electrical current flowing through resistances. These resistances are composed of the bulk resistance of the parts being welded, and of the contact resistances at the interfaces between the ...
Review and Advances of Coupling Methods for the ICFD Solver in LS-DYNA
F. Del Pin, I. Caldichoury, R. Paz (LSTC)
The ICFD solver in LS-Dyna specializes in the solution of Incompressible fluid flows. The main goal is to accurately predict the values of pressure and velocity subject to the constraint that Div(v)=0 where v is the fluid velocity. One area of applications is the prediction of lift and drag in aerodynamics of external flows, detachment or recirculation for internal flows, etc. These are what could be regarded as typical CFD applications. The ...
Secondary Shocks and Afterburning: Some Observations
Len Schwer (SE&CS)
Air blast tests that included normally reflected pressure measurements by the University of Sheffield, provided evidence of the so called ‘secondary shock.’ This repeat test data provided an opportunity to explore the effect of the LS-DYNA afterburning model parameters on the time of arrival and magnitude of the secondary shock. While the measured pressure histories alone are insufficient to uniquely calibrate the afterburn model, this ...
Secondary Shocks and Afterburning: Some Observations
Len Schwer (SE&CS)
Air blast tests that included normally reflected pressure measurements by the University of Sheffield, provided evidence of the so called ‘secondary shock.’ This repeat test data provided an opportunity to explore the effect of the LS-DYNA afterburning model parameters on the time of arrival and magnitude of the secondary shock. While the measured pressure histories alone are insufficient to uniquely calibrate the afterburn model, this ...
Short Introduction of a New Generalized Damage Model
T. Erhart, F. Adrade (DYNAmore); P. Du Bois (Consultant)
In LS-DYNA, several constitutive models exhibit properties that are based on Continuum Damage Mechanics (CDM) [1]. Associated isotropic or anisotropic stress degradation represents softening and failure behavior of metals (e.g. *MAT_104), composites (e.g. *MAT_221), polymers (e.g. *MAT_187), and other material types. As an alternative, sophisticated (e.g. stress state dependent) damage models such as GISSMO [2, 3] or DIEM [4] can be used as ...
Simulating Dynamic Loads on Concrete Components using the MM-ALE (Eulerian) Solver
S. K. Tay, R. Chan, J. K. Poon (Ministry of Home Affairs)
A 3-stage loading on a reinforced concrete beam-column involving pre-load, blast and post-blast compression to failure was analyzed with the S-ALE solver. This paper presents the findings from the simulation and the results were compared to full-scale blast trials of reinforced concrete beam-column test specimens.
Simulating Reinforced Concrete Beam-Column Against Close-In Detonation using S-ALE Solver
Shih Kwang Tay, Roger Chan, Jiing Koon Poon (Minstry of Home Affairs
A 3-stage loading on a reinforced concrete beam-column involving pre-load, blast and post-blast compression to failure was analyzed with the S-ALE solver. This paper presents the findings from the simulation and the results were compared to full-scale blast trials of reinforced concrete beam-column test specimens.
Simulation of Agricultural Soil Tillage Machine using DEM
H. Mouradjalian, Z.Asaf, I. Shmulevich (Technion - Israel Institute of Technology); B. Zion (Israeli Agricultural Research Organization)
Increasing number of hit and run pedestrian accidents highlight the importance of accident reconstruction tools used in forensic investigations. The tools used nowadays are based on simplified assumption of particle – particle interactions (Searle’s model), or real life accidents (Happer’s model) which enable for prediction of the collision velocity based on pedestrian throw distance evidence obtained at the scene of the accident. Unfortunately, ...
Simulation of Flow Induced Vibrations in Pipes using the LS-DYNA ICFD Solver
M. Timgren (DYNAmore Nordic)
Flow induced vibrations (FIV) is an important phenomenon to understand for m-shaped jumpers which are used in offshore applications. To understand how the FIV affects the life time of a m-shaped jumper FSI simulations have been used. Many papers have investigated two-phase flow in m-shaped jumpers and performed FSI simulations to understand how the flow affects the movement of the pipe. No or little information is available on how big impact the ...
Simulation of Fluid-Structure Interaction between Injection Medium and Balloon Catheter using ICFD
L. Wiesent, M. Wagner(OTH Regensburg)
Arteriosclerosis is a major health issue worldwide. While it is commonly treated by the implantation of an balloon-expandable stent, micro injuries may occur during stent deployment, and induce in-stent restenosis, whose consequence can be fatal. Studying this undesirable phenomenon is usually limited as experimental data is hard to obtain on ethical ground. Numerical simulation are performed to better understand this problem. To construct a ...
Small Electric Car Front Cross-Member Assembly Low Speed Impact Simulation
Prof. G. Lampeas; I. Diamantakos, K. Fotopoulos (University of Patras); I. Benito (Batz S.);
In the frame of EVolution project a small electric car has been developed. One of the demonstrators of car structure design is the front cross-member assembly. In the present work the numerical simulation of the front cross-member assembly low speed impact is presented. The crash is considered according to Allianz test protocol. The basic features of the front cross-member assembly structure comprise the application of foam type materials ...
Study of Occupant Lower Leg Injury Value Using Interface New Function
T. Ishihara, H. Sugaya, K. Maehara, H. Mae (Honda R&D)
■ Background In recent years, development at CAE in automotive development is an indispensable technology to shorten the development period and reduce the prototype cost. The crash safety CAE has been used for development as well, but the occupant injury value (especially Lower Leg injury value) is predicted to be greatly affected by deformation of the vehicle frame in addition to modeling of Restraint device. In addition, occupant dummy ...
Study on the Electromagnetic Flux Generation using the new 2D Axisymmetric Capability of Electromagnetism Solver in LS-DYNA
K. Takekoshi (Terrabyte)
Study on the electromagnetic flux generation using the new 2D axisymmetric capability of electromagnetism solver introduced in LS-DYNA version R9 will be presented by comparing with the result calculated using 3D electromagnetism solver previously reported.
TB11 Test for Short W-Beam Road Barrier
K. Wilde, S. Burzyński, D. Bruski, J. Chróścielewski (Gdańsk University of Technology)
In this report we investigate numerical crashtests performed on short section of w-beam road barrier. In typical in-situ test, 60 m section of barrier is tested, while in real life application, shorter sections are often employed. In our numerical analysis, 20 m long section is simulated, hit by 900 kg car at 20°. angle. Total number of 31 simulations were performed, giving insight into cars behaviour and ASI parameter value with variation to ...
Test and simulation approach towards the certification of an aircraft structure subjected to a bird strike
H. Abdulhamid, F. Plassard (Thiot-Ingenierie)
Thiot-Ingenierie worked with a compagny specialised in Retrofit packages for the aviation industry. To improve Satcom and connectivity systems, the compagny developed a dedicated structure able to handle a radome with communication means inside. The goal of the project is to design and certify a structure that is an interface between the radome and fuselage. This radome can be subjected to a bird strike and the study aims is to ensure that the ...
Testing in Support of the Development of Accurate Numerical Simulations of Plastic Deformation and Failure
A. Gilat, J. Seidt (The Ohio State University)
Testing in support of the development of materials models in numerical simulations consists of material characterization tests and validation tests. Testing at various strain rates, temperatures, and loading conditions is used for characterizing plastic deformation and failure of materials. The data from the tests is used for developing constitutive equations (material model) that are utilized in numerical codes that are used for simulations of ...
Textile Process Simulation as Part of Process Chain
H. Finckh, F. Fritz, G. Gresser (Institut für Textil- und Verfahrenstechnik)
By simulation of the whole textile generation process at a micro-/mesoscopic level, the interaction between machine parts and the textile as well as the threads among each other can be studied in detail. The result is a highly detailed virtual textile which can be either used for further process simulations like draping or virtual testing. In the latter the computation of mechanical properties for macroscopic draping or structural applications ...
The Benefits of Scripting for CAE Engineers – How a Little Can Go a Long Way
G. Newlands, M. Thornton (ARUP)
The pressure on a CAE engineer can be great at times, with tight schedules and demands for results. Sometimes the exact tools you require are not available – but what if you could create them yourself? Writing a script or tool to speed up a process may seem daunting, or not worth the effort. Why would you spend a day writing a script to do something when it will take you a couple of hours to actually do the task? The answer is often it will not ...
The Digital Prototype as Part of Envyo - Developent History and Applications within the ARENA2036 Environment
C. Liebold, A. Haufe (DYNAmore); M.Vinot (DLR)
DigitPro, a sub-project of the government funded research project Active Research Environment for the Next generation of Automobile (ARENA2036) deals with the development of a Digital Protoype, a closed simulation process chain which not only covers different simulation disciplines such as crushing or process analysis, but also various material modeling approaches on the micro-, meso-, and macro level. Various software tools are being used by ...
The Structural Conjugate Heat Transfer Solver - Recent Developments
T. Klöppel (DYNAmore)
It is the objective of this contribution to present and discuss recent developments in the structural conjugate heat transfer solver in LS-DYNA to be used mainly for the thermo-mechanical coupled simulation of complex manufacturing processes such as for example hot forming, heat treatment and welding. Beside the multi-physics nature the complexity of these processes is due to the usually challenging constitutive behavior of the employed ...
Thermal Coupling Method Between SPH Particles and Solid Elements in LS-DYNA
J. Xu, J. Wang (LSTC)
Smooth particles hydrodynamics is a meshfree, Lagrangian particle method and a simple, yet flexible method for modeling fluid flows and solid bodies in a robust way. It has been applied extensively to the multiphase flows, heat conduction, high explosive problems and so on. For the thermal coupling between any two parts in LS-DYNA, the standard way is through thermal contacts which require the contact areas between those two parts. Due to ...
Tool Cooling Simulation for Hot Forming
T. Kuroiwa (JSOL)
Our solution development status on hot forming technique will be reported with a special focus on tool cooling. Hot forming is one of the most promising techniques among which contribute to saving weight of automobiles. Thermal management of blank material is especially important to ensure the hardness of it, since sufficiently rapid cooling of heated blank is needed to cause martensitic transformation. There are two reasons to do a CAE analysis ...
Topology Optimization Methods based on Nonlinear and Dynamic Crash Simulations
Prof. F. Duddeck, M. Bujny, D. Zeng (TU München)
Topology optimization for crashworthiness has been investigated during the last years, starting from methods based on linear elastic and static simulations1 or so-called equivalent static loads (ESL) obtained by a single nonlinear crash simulation with a subsequent optimization loop based on the linear stiffness matrix and the corresponding sensitivities2. Both methods do not consider material nonlinearities in their optimization process, which ...
Validation of Thums Human Model Throw Distance in Pedestrian Accident Scenarios
M. Orlowski, C. Bastien, M. Bhagwani (Coventry University)
Increasing number of hit and run pedestrian accidents highlight the importance of accident reconstruction tools used in forensic investigations. The tools used nowadays are based on simplified assumption of particle – particle interactions (Searle’s model), or real life accidents (Happer’s model) which enable for prediction of the collision velocity based on pedestrian throw distance evidence obtained at the scene of the accident. Unfortunately, ...
Verification and Validation of LS-DYNA for the Transport and Storage of Radioactive Materials
G. Marchaud, V. Saint-Jean (Areva)
solutions for radioactive material with the highest levels of safety and security. Transportation and storage casks are designed to comply with stringent regulations. For instance, a cask designed to transport radioactive material may be required to withstand a 9m drop onto a flat unyielding target. AREVA TN performs LS-DYNA analyses to evaluate the crashworthiness of casks and to reduce the number of costly real tests. Such a methodology ...