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11th European LS-DYNA Conference

Salzburg, 2017

A 3D Discontinuous Galerkin Finite Element Method with the Bond-Based Peridynamics Model for Dynamic Brittle Failure Analysis
W. Hu, B. Ren, C.T. Wu, Y. Guo, J. Wu (LSTC)
Peridynamics is a new nonlocal theory that provides the ability to represent displacement discontinuities in a continuum body without explicitly modelling the crack surface. In this paper, an explicit dynamics implementation of the bond-based peridynamics formulation is presented to simulate the dynamic fracture process in 3D elastic solid. Based on the variational theory, the Discontinuous Galerkin (DG) approach is utilized to formulate the ...
A Comparison between Three Air Blast Simulation Techniques in LS-DYNA
H. Bento Rebelo, C. Cismasiu (Universidade NOVA de Lisboa)
When simulating structures subjected to the effects of blast loading, one might resort to three different methods of simulation. These methods are the empirical blast method, also known as Load Blast Enhanced (LBE), the Arbitrary Lagrangian Eulerian (ALE) method, and a coupling method that allows the application of empirical blast loads on air domain simulated with the ALE formulation. Furthermore, for the ALE method, both a mapping technique, ...
A Comparison between Three Air Blast Simulation Techniques in LS-DYNA
H. Bento Rebelo, C. Cismasiu (Universidade NOVA de Lisboa)
When simulating structures subjected to the effects of blast loading, one might resort to three different methods of simulation. These methods are the empirical blast method, also known as Load Blast Enhanced (LBE), the Arbitrary Lagrangian Eulerian (ALE) method, and a coupling method that allows the application of empirical blast loads on air domain simulated with the ALE formulation. Furthermore, for the ALE method, both a mapping technique, ...
A Comparison of Damage and Failure Models for the Failure Prediction of Dual-Phase Steels
F. Andrade (DYNAmore); M. Feucht (Daimler)
The aim of this contribution is the comparison of different damage failure models that are available in LS-DYNA. In particular, the focus is concentrated on the failure prediction of dual-phase steels which are largely used in the automotive industry. Typically, such alloys provide a good compromise between ductility and strength for which this kind of material is also often used in safety relevant components. Examples are parts of B-pillars, ...
A Layer by Layer Approach for Simulating Residual Stresses in AM
N. Strömberg (Örebro University); M. Schill (DYNAmore)
Distortions and residual stresses developed during additive manufacturing (AM) might be so severe that the design does not meet tolerance requirements or even cracks and fail. Predictions of such distortions and residual stresses by finite element analysis are therefore preferable performed early during the design development in order to reduce such problems. One approach for this kind of analysis is to apply techniques from welding simulations ...
A New Eigensolver for High Performance NVH Analysis: MCMS (Multi-Level Component Mode Synthesis)
Prof. K. Chang-Wan (Konkuk University); R. Grimes (LSTC)
NVH (Noise, Vibration, and Harshness) problem is one of the most important targets for comfortable and quiet product design. Especially, in automobile industry, as the degrees of freedom of NVH automobile FE model increases, from millions of degrees of freedom to tens or hundreds millions of degrees freedom, the computational time for NVH analysis becomes serious bottle neck in automobile design and analysis process. Therefore, it has been ...
A New Failure Criterion for Laminated Safety Glass
C. Alter, S. Kolling (TH Mittelhessen); J. Schneider (TU Darmstadt)
The prediction of the head injurie criterion (HIC) for pedestrian protection in automotive applications is still a great challenge. In particular, the simulation of the head impact on windshields requires a reliable FE-modelling technique as well as predictive material laws including the constitutive behaviour up to fracture. In the present work, a new failure criterion for laminated safety glass under low velocity impact is presented. The model ...
A Review of S-ALE Solver for Blast Simulations
I. Kurtoglu, B. Balaban (FNSS Savunma Sistemleri)
Blast modeling and simulation is a very important field in the military land vehicle industry. Increasing demands for higher protection levels leads the engineers to more challenging design and simulation cases. In most situations, Arbitrary Lagrange Euler (ALE) method is the most well-known method for blast simulations and also for determining the effects of blast loads on structures. Various studies are performed for the effect of mesh size ...
A Review of Strucural Part Modelling for Blast Simulations
G. Balaban, I Kurtoğlu (FNSS Savunma Sistemleri)
In this study, the effects of various element formulations and mesh sizes are investigated for buried charge simulations using the non-linear finite element code LS-DYNA®. Simulations are performed according to the real test conditions and the results are compared with the plate level mine blast experiments. Tests are carried out using a test setup which is designed and manufactured by FNSS. The blast simulations are examined using ALE method. ...
A Roadmap to Linear and Nonlinear Implicit Analysis with LS-DYNA
G. Laird (Predictive Engineering)
The default LS-DYNA settings are tailored for running large explicit analyses. For new and even experienced users, it can be challenging setting up an implicit LS-DYNA analysis to match analytical solutions or other standard implicit FEA codes. For example, the default element formulations are based on single-point integration whereas implicit analyses benefits from full-integration. A series of example problems are provided that will allow the ...
A Status Review of Failure Simulation at the Federal Aviation Administration
D. Cordasco, W. Emmerling (Federal Aviation Administration); P. DuBois (George Mason University)
The Federal Aviation Administration (FAA) is developing models and methods for simulating fan blade off impact for engine containment. Accurately predicting deformation and failure in such an event is essential for advancing the industry and FAA goal of certification by analysis. Furthermore, industry and government engineers require publicly available tools to standardize the analysis during the engine design, development and certification ...
A Systematic Study on Topology Optimization of Crash Loaded Structures using LS-TaSC
K. Weider, A. Marschner, A. Schumacher (Bergische Universität Wuppertal)
In this contribution the chances and limitations of using LS-TaSC for topology optimization of crash loaded structures will be shown. With two demonstrative examples the influence of scaled loads, intermediate densities and conflicting constraints are discussed. As no analytical sensitivities are available in explicit finite element simulations, LS-TaSC uses the interal energy density as sensitivity, which makes it an efficient optimization ...
A Unified Environment For Processing Test Videos And Simulation Models
S. Kleidarias, V. Pavlidis (BETA CAE Systems)
Throughout the development process of a complex structure such as a vehicle, simulation and testing are both present in almost all phases. Being able to use them efficiently and concurrently whenever this is needed, it maximizes the benefit to the user, as this provides valuable information to identify defects in either the simulation or the test and therefore, avoid errors and delays in the development chain. One common type of test result is ...
Absorbing Materials - Tests Versus Simulations
R. Ridky, M. Popovic (SVS FEM); M. Drdlova (Výzkumný ústav stavebních hmot); O. Koutny (Bogges)
An absorption capacity of soft, viscoelastic materials at high strain rates is included in wide range of practical applications. One of the critical questions in any similar analysis is setup of material properties including all physical constants. There are many kinds of tests analysing dynamic properties of absorbing elements. In many cases testing and also numerical simulations are influenced by many types of measurement and simulation ...
Acoustic Aalysis for Impact Sound with LS-DYNA
R. Ishii (JSOL); T. Yamamoto (Nihon Emsco); Z. Cui, Y. Huang (LSTC)
LS-DYNA is heavily used to analysis transient phenomenon like car crash and makes a huge achievement about physical simulation in a wide variety of industry. For the goal of LS-DYNA, gone-model , one-codeh as solution it give you, a wide variety of function has been developed at each section. Nowadays, LS-DYNA has been developed further and become possible to evaluate Frequency domain analysis and Acoustic analysis as ...
Advances in IGA for Sheet Metal Forming Applications
S. Hartmann (DYNAmore); D. Benson (LSTC); A. Nagy (LSTC)
In the last years, Isogeometric Analysis (IGA) has become very popular in the scientific research community. Various types of basis functions are investigated by the researchers, while the most widely used geometry representation in the Computer-Aided-Design (CAD) community is based on NURBS. It has been shown, that NURBS are particularly well suited for finite element analysis leading to qualitatively more accurate results in comparison with ...
Air Blast Reflections and Angle of Incidence
Len Schwer (SE&CS)
The Unified Facilities Criteria 3-340-02 provides blast wave reflection ratios as a function of angle-of-incidence as Figure 2-193. However no text is provided indicating the source of this information. A knowledgeable source provided that the figure combines experimental and analytic results. In an effort to assess the UFC information, comparisons are made two different sets of small scale experiments and LS-DYNA Eulerian simulation ...
Airbag Folding with JFOLD - Latest Developments and Case Studies
R. Taylor (ARUP); S. Hayashi (JSOL)
JFOLD is a software tool that helps users perform simulation based airbag folding in LS-DYNA. Today’s airbag deployment analysis demands accurate folding of complex designs, but this is often a very time consuming process requiring expert input. JFOLD’s continuous development focuses on making the process simpler and quicker and to give the non-expert access to complex folding techniques. This is achieved through three core elements: intuitive ...
An Analysis of the Hot-forming Process with Thermal and ICFD Simulations
M. Kintsch, S. Szabo, R. Schneider (Voestalpine Automotive Components)
An Implicit Study of High Order Elements in LS-DYNA
T. Borrvall (DYNAmore Nordic); Prof. D. Benson, H. Teng (LSTC)
An overall trend in simulation technology is towards increasing the accuracy of model features to yield a more rapid convergence with mesh refinement. In the context of element technology, migrating from shells to solids or from low to high order elements are possible ways to accomplish this. High order elements are therefore of particular importance in implicit analysis, where spatial discretization is limited by algorithmic complexity and ...
An Ivestigation into Modeling Approaches for the Dynamic Response of a Shipping Container Cart and Suspended Automotive Parts under Random Base Excitation using LS-DYNA
Prof. S. Noll, A. Ramanathan (Ohio State University); E. DeHoff, R. Rittenhouse (Honda)
Shipping containers are exposed to complex dynamic loading conditions during transport via truck, rail, and air. The loading conditions are further complicated by contact nonlinearities between the cart and ground, between cart holders and suspended parts, and between neighboring suspended parts. This study focuses on developing a modeling strategy to simulate a container cart with parts undergoing ASTM D4728 truck random vibration tests. ...
Application of Digital Image Correlation to Material Parameter Identification using LS-OPT
N.Stander (LSTC); K. Witowski, A. Haufe, M. Helbig, D.Koch, C. Ilg (DYNAmore)
Digital Imaging Correlation (DIC) is an optical method which provides full-field displacement measurements for mechanical tests of materials and structures. It can be used to obtain temporal displacement, deformation or strain fields from an experimental coupon and can be combined with Finite Element Analysis to identify the constitutive properties of a material [1]. Because DIC-based parameter identification is an inverse process, ...
Application of Model Order reduction Techniques in LS-DYNA
P. Friedrich (SCALE)
Applications of ICFD / SPH Solvers by LS-DYNA to Solve Water Splashing Impact to Automobile Body
G. Wang, E. DeHoff (Honda); F. Del Pin, I. Caldichoury, E. Yreux (LSTC); K. Gardner (Ohio State University)
When a vehicle runs at high speed on a watery or muddy road, the high speed splashing generated by tire rotation often causes damage to the underbody panels. This is a challenging dynamic FSI (fluid-structure interaction) problem for Honda to consider. ICFD and SPH are two powerful solutions used in FSI applications, especially for high speed flow and with dynamic free surface evolution. This paper presents some FSI solutions of water splashing ...
Applications of ICFD solver by LS-DYNA in Automotive Fields to Solve Fluid-Solid-Interaction (FSI) Problems
G. Wang, P. Rodriguez, J. Tippie, S. Smith (Honda R&D Americas); F. Del Pin, I. Caldichoury (LSTC)
Fluid-solid interaction (FSI) becomes a more and more important and wider application field in the automotive industry. It is challenging to CAE engineers to predict performance of complicated systems under high speed flow and with dynamic free surface evolution. This paper presents the three following FSI accomplishments in the power sports field by using ICFD solver from LS-DYNA®.
Applications of Multiscale and Subcycling methods for Press Hardened Steel Parts Failure Assessment
Y. Drouadaine (ArcelorMittal)
Press Hardened Steel (PHS) parts, like B-pillar made of Usibor® 1500, are today the best steel solutions in order to fulfil the most aggressive crash requirements with the lowest body structure mass. However, these severe crash conditions request a failure risks analysis during the vehicle design process. The usual Usibor® 1500 failure modelling method proposed by ArcelorMittal always remains compatible with a current full car model mesh size, ...
Applying Buried Mine Blast Loads to a Structure Utilizing the User Module Capability
E. Lazerson, H. Raz, Z. Asaf (Plasan SASA)
Developing armored vehicles to withstand a buried mine blast is a challenging task. The development of solution with optimum trade-off between mobility and survivability cannot be done by trial and error alone. The development of reliable CAE model of the vehicle and threat, using a simulative tool, is essential. In the early design phase, extensive use of simulation is done to optimize the structure. This process requires a short turnover ...
Assessment of the Capacity of a Reinforced Concrete Structure for Impact with Military Jet Aircraft
M. Miloshev, M. Kostov (Risk Engineering)
The current paper presents analysis of a reinforced concrete structure for impact with Phantom F-4 military aircraft. The analysis is performed by the missile-target interaction method. The finite element (FE) model of the aircraft is validated by comparison of the load-time function, obtained by numerical impact simulation into rigid planar target to the one, obtained from full-scale impact test. The latter was performed in 1988 at the SANDIA ...
Battery Abuse Simulations Using LS-DYNA
P. L'Eplattenier (LSTC)
Safety is an important functional requirement in the development of large-format, energy-dense, lithium-ion (Li-ion) batteries used in electrified vehicles. Computer aided engineering (CAE) tools that predict the response of a Li-ion battery pack to various abusive conditions can support analysis during the design phase and reduce the need for physical testing. In particular, simulations of the multiphysics response of external or internal short ...
Biotex BigBag Simulation - LS-DYNA Airbag Tool Unusual Application
C. Weinberger, B. Hirschmann (4a engineering); Johanna Eichelter (Franz S. Huemer)
Cause Investigation of Capsizing Accident of Ro-Ro Ferry Ship using Marine Accident Integrated Analysis System
S. Lee, J. Lee, J. Park, T. Jung (Korea Maritime & Ocean University)
Ro-Ro Ferry ship was capsized and was sunk down to the bottom in the sea water due to the rapid turning for the several reasons, such as lack of stability and poor lashing, etc. Objective of this study is to investigate the capsize accident cause by full-scale ship rapid turning simulation through the comparison with AIS track in this capsize accident, considering several factors, such as GoM, ship velocity, rudder angle, etc., and using Marin ...
Cause Investigation of Flooding & Sinking Accident of Ro-Ro Ferry Ship using Marine Accident Integrated Analysis System
S. Lee, J. Lee, J. Park, T. Jung (Korea Maritime & Ocean University)
Ro-Ro Ferry ship was capsized and was sunk down to the bottom in the sea water due to the rapid turning for the several reasons, such as lack of stability and poor lashing, etc. Objective of this study is to figure out the air pocket existence in the flooding & sinking accident using Marin Accident Integrated Analysis System (MAIAS; highly advanced M&S system of Fluid-Structure Interaction analysis technology). Several things were carried for ...
Characterization and Modeling of Engineering Friction and Wear with LS-DYNA
S. Dong (Ohio State University); A. Sheldon (Honda)
In mechanical systems, friction and wear usually take place concurrently between two surfaces when they slide or roll relative to each other. Friction exhibits resistance to the relative motion which may vary with different normal loads and relative velocities, while wear is the removal and displacement of the materials from one or both surfaces. The initiation of significant surface wear, in turn, changes the friction, and therefore the overall ...
Characterization and Modeling of Spot-Weld Joints in Press Hardening Steels Associated with Softening in Heat Affected Zone
H. Ghassemi-Armaki, Q. Khan (ArcelorMittal); A. Gill, S. Zilincik (Chrysler)
Next generation of advanced high strength steels (AHSS) are extensively considered for usage in Body-in-White (BIW) with lower thickness to reduce the vehicle weight and increase fuel efficiency. Resistance Spot Welding (RSW) continues to be a major joining process in BIW, with an average of 4500 spot-welds per vehicle. Spot-weld strength has direct correlation with the thicknesses, and yield strength of the joining sheets in the stack up ...
Characterization and Modeling of the Deformation and Failure Behavior of Neat Thermoplastic Homopolymers under Impact Loading Conditions
P. Stelzer, Z. Major (Johannes Kepler University Linz)
The increasing use of thermoplastic polymers in structural applications exposed to impact loading conditions drives the need of accurate and reliable FEM simulations. Classical elasto-plastic formulations are based on the von Mises yield criterion and only of limited suitability for modeling polymers. Advanced material models become necessary to capture the complex mechanical deformation and damage behavior. However, the experimental ...
Combined Analysis of LS-DYNA Crash-Simulations and Crash-Test Scans
L. Jansen, D. Borsotto, C. Thole (Sidact)
In robustness campaigns and optimization processes metamodels are created out of a set of crash-simulations. With the help of such analyses the models used for the simulations can be improved. For example instabilities can be found and explained or the needed material can be minimized under certain safety restrictions. An important question in this context is: How good can these metamodels represent the reality? To answer this question, one ...
Comparison of MM-ALE and SPH methods for modelling blast wave reflections of flat and shaped surfaces
Jovan Trajkovski (University of Ljubljana)
The Multi-Material Arbitrary-Language-Euler (MM-ALE) and Smooth-Particle-Hydrodynamics (SPH) are widely used methods for numerical examination of structural response under blast loading. On the other hand, the methods are quite demanding for use. They have their own advantages and disadvantages depending on the structural geometry and its relative position with regard to the blast wave source location. This paper presents comparison results of ...
Comparison of the RHT Concrete Material Model in LS-DYNA and ANSYS AUTODYN
C. Heckötter, J. Sievers (GRS)
The goal of this paper is to compare the implementations of the RHT concrete model developed by Riedel, Hiermaier and Thoma in the commercial hydrocodes ANSYS AUTODYN and LS-DYNA for different stress conditions. The considered stress conditions include hydrostatic compaction related to the Mie-Grüneisen equation of state in conjunction with a p-α model, uniaxial tension, uniaxial compression and tri-axial compression. Parameters of the failure ...
Compression Molding Analysis of Long Fiber Reinforced Plastics using Coupled Method of Beam and 3D Adaptive EFG in LS-DYNA
S. Hayashi (JSOL); H. Chen, W. Hu (LSTC)
Composite materials like fiber reinforced plastics (FRP) are becoming more widely used in the automotive industry and have been found very effective in reducing vehicle weight. Recently, long carbon fiber reinforced thermoplastics are increasingly being used for lightweight structural parts with high stiffness, strength and energy absorption performance. Compression molding is considered one of the most efficient manufacturing processes to mass ...
Computational Material Models for TSCP Plastics Comparison of the Deformation Behavior with MAT 24 and MAT SAMP-1 with DIEM
M. Dobes, J. Navratil (Robert Bosch)
The subject of this article is comparison of the deformation and stress response for two computational material models suitable for POM material. Both material models use erosion of finite elements, but in the first case *MAT_24 is used together with MAT_ADD_EROSION and with parameters combination and in the second case *MAT_SAMP-1 is used together with DIEM (Damage Initiation and Evolution Model). The new computation material model SAMP-1 was ...
Continuous Simulations from Resistance Spot Welding Process to Joint Strength
S. Yagishita, T. Kawashima, N. Ma (JSOL)
Control System in LS-DYNA
C. Keisser (DYNAmore); I. Yeh (LSTC)
Control System is a very old concept aimed at improving or changing the behavior of any dynamic system. In our daily lives, there are many control applications like in a toaster or in room temperature regulators but also in our cars when using cruise control or ABS. More recently, Control System appears to be also very useful and powerful in pre-crash safety or in modeling Human Body response. The control can be as simple as an On/Off action ...
Creep Modeling Of Plastic Components in Sealed Connectors
H. E. Miled (Delphi Connecting Systems)
This work address the sealed connectors for engine compartment in particular high pin count housings and pin header. Silicon components, such as grommets and interfacial seals, are used and designed to ensure good contact pressure on plastic components and thus good sealing performance. On several products, we noticed a deformation of plastic housings, in contact with seals, that leaded to a loss of sealing performance. This deformation is the ...
Curve Comparison using esiCORA
M. Sommer, M. Seshadri (ESI)
Data Management and Loadcase Composition in ANSA
T. Fokilidis, L. Rorris, T. Loiras (BETA CAE)
It is common knowledge that simulations of virtual models hold a key role during the design process of a vehicle. Considering the continuously growing number of regulations, but also the different variants that a vehicle can have, one concludes to a plethora of similar or completely different simulations. As far as a simulation process is concerned one of the most demanding issues is its build up. The tools that a CAE analyst should have at ones ...
Define_Pressure_Tube: Simulating Pressure Tube Sensors in Pedestrian Crash
J. Karlsson (DYNAmore Nordic)
This paper presents the new keyword *DEFINE_PRESSURE_TUBE, designed to efficiently simulate pressure waves in a thin air-filled tube. The main application in mind is a crash detection system for pedestrian safety, where an air-filled tube is embedded in the front bumper and fitted with pressure sensors at the ends. In the case of an impact, the tube is compressed and a pressure wave travels to the sensors, enabling localization and extent of ...
Development of a 2015 Mid-Size Sedan Vehicle Model
R. Reichert, S. Kan (George Mason University)
A detailed finite element model of a 2015 mid-size sedan vehicle was developed using a reverse engineering process. The model consists of about 1000 parts and 2.25 million elements representing geometry, connections, and material characteristics of relevant structural and interior components. This paper describes the level of detail of the simulation model, the validation process, and how it performs in various impact configurations when ...
Development of Accurate Finite Element Models and Testing Procedures for Bolted Joints in Large Caliber Gun Weapon Systems
M. Koehler; G. Fish (US Navy)
Large caliber weapon systems, such as those mounted on tracked vehicles or in turrets on ships, typically develop large forces when fired, which are transmitted to the structure that houses them. In the case of modular weapon systems, often the platform for the weapon system is already developed and the weapon system is integrated at a later stage. In this scenario, it becomes imperative to fully quantify the loads experienced in the bolted ...
Discrete Element Modelling of a Metamaterial for Launcher Tanks Dynamic Experiments
T. Legaud, E. Grippon, V. Lapoujade, P. Chiambaretto (DynaS+); S. Nguyen, Y. Gourinat (Isae-Supaero); V. Fascio (Ateca)
Ductile Failure in Large-Scale Analyses of Aluminium Structures
D. Morin, T. Berstad, O.S. Hopperstad, M. Langseth (NNTU)
Modelling of ductile failure in aluminium alloys is of high importance during the design of lightweight structures subjected to impact loading. Such designs are today based on numerical analyses and their credibility is crucial to reduce the development time and costs of such products. Under impact conditions, lightweight structures are most likely exposed to severe loadings and failure is a phenomenon which cannot be ignored. To accurately ...