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12th International LS-DYNA Conference 2012

Investigation of the Effects of the Coil Design on Electro-Magnetic Forming of a Thin-Walled Aluminum Tubular Material
H. Kim, P. L'Eplattenier (Edison Welding Institute), I. Caldichoury (Livermore Software Technology Corp.), J. Shang (American Trim)
In this study, a thin-walled aluminum tube was expanded using the electro-magnetic forming (EMF) process. Two different designs of coil were developed using EMF simulations with LS-DYNA's electromagnetic module in version 980. The initial thickness of the aluminum tube was 0.254 mm (0.01 in.) and the material of the tube was Aluminum 3000 (Al-3000). This aluminum material is known to be difficult to expand more than a 9% expansion ratio at ...
Investigation of the Thermal Effects of Magnetic Pulse Forming using LS-DYNA
D. Chernikov, V. Gluschenkov (Samara State Aerospace University)
P. L’Eplattenier (Livermore Software Technology Corp.)
This paper shows the results o f LS-DYNA simulations and experimental studies of various sources of thermal effects occurring during magnetic pulse forming: theJoule heating of the eddy currents, the work of plastic deformation and the collision with the die. The obtained results allow quantifying the thermal effects and their influence on the mechanism of high-speed deformation: the technological plasticity of the forming process, the level ...
Large Scale Normal Modes and PSD Analysis with Nastran and LS-DYNA
George Laird (Predictive Engineering)
From its conception in 1976, LS-DYNA has become a world-renowned analysis code used for the simulation of complex, real-world problems. Its power stems from the simple fact that it was written early on with an eye toward harnessing the resources of a variety of computational platforms. This strategy has allowed LS-DYNA to solve large scale, multi-physics problems that were impossible just a few years ago. LS-DYNA developers have also been ...
Limitations of Smeared Crack Models for Dynamic Analysis of Concrete
Y. S. Khoe, J. Weerheijm (TNO)
Performance prediction of concrete structures under explosive loadings or impact is an essential part of the research that is being performed within TNO. One of the current research topics is the explosive safety of tunnel structures. In the context of this research we evaluate the capabilities and limitations of concrete material models in LS-DYNA. The evaluation focuses on the CSCM concrete model and in particular the damage and ...
LS-DYNA 980: Recent Developments, Application Areas and Validation Process of the Incompressible Fluid Solver (ICFD) in LS-DYNA - Part 1
F. Del Pin, I. Caldichoury (LSTC)
LS-DYNA version 980 will include CFD solvers for both compressible and incompressible flows. The solvers may run as standalone CFD solvers where only fluid dynamics effects are studied or they could be coupled to the solid mechanics and thermal solvers of LS-DYNA to take full advantage of their capabilities in order to solve fluid-structure interaction (FSI) problems. This paper will focus on the Incompressible CFD solver in LS-DYNA (ICFD) ...
LS-DYNA 980: Recent Developments, Application Areas and Validation Process of the Incompressible Fluid Solver (ICFD) in LS-DYNA - Part 2
I. Caldichoury, F. Del Pin (LSTC)
LS-DYNA version 980 will include CFD solvers for both compressible and incompressible flows. The solvers may run as standalone CFD solvers where only fluid dynamics effects are studied or they could be coupled to the solid mechanics and thermal solvers of LS-DYNA to take full advantage of their capabilities in order to solve fluid-structure interaction (FSI) problems. This paper will focus on the Incompressible CFD solver in LS-DYNA (ICFD) ...
LS-DYNA ALE Nodal Coupling
H. Chen, J. Wang (LSTC)
LS-DYNA ALE solver has been used extensively on modeling fluid and gas behaviors. The accompanying FSI solver has been successfully applied on series of engineering problems such as tank sloshing, tire hydroplaning, bottle dropping, HE blasting, etc. The FSI solver, invoked by the *CONSTRAINED_LAGRANGE_IN_SOLID card, is intended to couple between ALE fluid elements and Lagrange structure segments. The LS-DYNA Discrete Elements recently ...
LS-DYNA Analysis of a Sacrificial Wall Designed to Protect Mechanically Stabilized Earth Retaining Walls
A. Abu-Odeh (Texas Transportation Institute), K.-M. Kim (Samsung C&T Corp.)
Mechanically Stabilized Earth (MSE) retaining walls are used to provide roadway elevation for bridge approaches, underpass frontage roads and other roadway elevation applications. Vehicular traffic may exist on the high (fill) side of the MSE retaining wall, on the low side, or both sides. For traffic on the high side, a conventional traffic barrier might be placed on or near the top of the wall and mounted on a moment slab or a bridge deck. ...
LS-DYNA Applications in Simulating Impact Tests of Nuclear Fuel Spacer Grids and Drop Tests of Fuel Shipping Packages
W. Zhao, Z. Karoutas, P. Evans, O. McRae (Westinghouse Electric Company, LLC)
Presented in the paper are two of our recent LS-DYNA applications in developing simulation models for: (1) impact tests of spacer grid – a key structural component of nuclear fuel, and (2) drop tests of shipping packages for fresh nuclear fuel, as described in the following, in that order. Resistance of nuclear fuel structure to impact loads during postulated seismic and/or loss-of-coolant accident (LOCA) events needs to be demonstrated to ...
LS-OPT Version 5: A New Flowchart-Based Interface for Process Simulation and Optimization
D. Björkevik, C. Belestam (DYNAmore Nordic), K. Witowski(DYNAmore GmbH), N. Stander (LSTC), T. Eggleston (Leawood)
®This paper provides an overview of the new flowchart-based interface for LS-OPT . The primary purpose of this development was to provide an interface for process simulation and optimization. An example of a manufacturing process is used to demonstrate problem setup and GUI functionality.
LS-TaSCTM Version 2
W. Roux (LSTC)
This paper gives an overview of LS-TaSC version 2.1, 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 dynamic load scaling are given.
Matching LS-DYNA Explicit, Implicit, Hybrid Technologies with SGI Architectures
O. Schreiber, T. DeVarco, S. Shaw (SGI), S. Bala (LSTC)
LSTC has now integrated Explicit, Implicit solver technologies into a single hybrid code base allowing seamless switching from large time steps transient dynamics to linear statics and normal modes analysis. There are multiple computer architectures available from SGI to run LS- DYNA. They can all run LSTC solvers using Shared Memory Parallelism (SMP), Distributed Memory Parallelism (DMP) and their combination (Hybrid Mode) as supported by ...
Material Model Evaluation of a Composite Honeycomb Energy Absorber
K. E. Jackson (NASA Langley Research Center), E. L. Fasanella (National Institute of Aerospace), M. S. Annett (NASA Langley Research Center), M. A. Polanco (ATK Space Systems)
Abstract A study was conducted to evaluate four different material models in predicting the dynamic crushing response of solid-element-based models of a composite honeycomb energy absorber, designated the Deployable Energy Absorber (DEA). Dynamic crush tests of three DEA components were simulated using the nonlinear, explicit ®transient dynamic code, LS-DYNA . In addition, a full-scale crash test of an MD-500 helicopter, retrofitted ...
Modeling and Simulation of Bridge - Track - Train Systems at High Service Velocities with LS-DYNA
M. Klasztorny, P. Szurgott (Military University of Technology, Department of Mechanics and Applied Computer Science)
The paper develops a new methodology of FE modeling and simulation of the bridge – track – train systems at high service velocities with the use of selected CAE systems. The methodology is presented on the KNI 140070 viaduct with composite (steel – concrete) superstructure and 14.40 m span length, located on the Central Main Line, Poland. A ballasted track and two types of high speed trains have been modeled physically and numerically. ...
Modeling Mine Blast with SPH
John M. H. Puryear, David J. Stevens (Protection Engineering Consultants), Ryan M. Alberson (University of Texas), Pat McMahon (Land Systems-MTVR/LVSR)
Accurately and efficiently modeling the loads applied to a vehicle by buried explosive (mine blast) is a persistent need. In this study, Smoothed Particle Hydrodynamics (SPH) was used to effectively model mine blast. The buried explosive and soil were modeled with SPH, while Lagrangian FEM elements were used for the vehicle plate. The approach was validated against a series of mine-blast experiments performed by the Ernst Mach Institute ...
MPI Optimizations via MXM and FCA for Maximum Performance on LS-DYNA
G. Shainer, T. Liu, P. Lui, T. Wilde (Mellanox Technologies)
From concept to engineering, and from design to test and manufacturing, the automotive industr y 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 ...
New Electrode Design for GEPI Shot to Test Curved Sample
G. Le Blanc, P. L'Eplattenier, I. Caldichoury (LSTC)
This study is relative to material behaviour characterization using the GEPI pulsed power device. First, the GEPI device will be briefly described. At the moment, only planar samples can be tested on GEPI. However, it is very attractive to test curved samples to comply with operational requirements. The adaptation of GEPI to curved sample would allow the characterization of material samples directly extracted from operational ...
Numerical Simulation of Impact on Solid Rocket Motors
N. Couroneau-Mortreuil (DGA EM)
Weapons safety and vulnerability have become a major field of activities for DGA EM in the past decades. It is now a major actor, along with its state and industrial partners, for the safety evaluation and the qualification of all missiles to be fielded in the French armed forces. While test activities were presented in a previous paper [1], the present paper focuses on the simulation activities and the numerical tools developed to assess ...
Oil-canning Simulation of Outer Panel and Influence of Stamping Results
Y. Hu (Chrysler Group LLC), J. Sun, X. Zhu (LSTC)
Abstract Oil-canning test is one of the most important measurements for outer panel stiffness. The methodology to analyze oil-canning of automotive outer panels using LS-DYNA® is studied and presented. Dynamic explicit method is used for stamping simulation and static implicit method is used for oil-canning simulation. The stamping results are carried over to oil-canning simulation. In one of the studies, displacement controlled indentation ...
On Mooney-Rivlin Constants for Elastomers
W. W. Feng, J. O. Hallquist (LSTC)
The Mooney-Rivlin constitutive equation for rubber is W= C1(I1-3)+C2(I2-3) where material constants C1 and C2 must be determined through tests. The constant C1 can be determined by uniaxial tension or compression tests; however, C2 cannot be determined accurately by uniaxial tension or compression tests. In order to determine C, biaxial tests must be performed. A biaxial test, inflation of a circular 2membrane, is presented in detail here ...
On Parameter Identification for the GISSMO Damage Model
J. Effelsberg, A. Haufe (DYNAmore GmbH), M. Feucht, F. Neukamm (Daimler AG), P. Du Bois (Consultant)
In order to improve predictiveness of crashworthiness simulations, great effort has been made regarding the treatment of crack formation and propagation. To achieve this, a consistent prediction of pre-damage, accumulated during manufacturing of a sheet-metal part, can help to improve accuracy. The constitutive models used for crash simulations are usually isotropic and based on the von Mises flow rule or the Gurson, Tvergaard & ...
On the Experiences of Adding a Complex User-Material-Model to LS-DYNA
G. S. Kalsi (AWE)
LSTC’s DYNA codes (both SMP and MPP) have been extensively used at AWE over a period of many years since they represent state-of-the art computational analysis capability which is required for simulating most of our complex problems. Occasionally there is a requirement to enhance existing code capabilities. An example is a need to improve the simulation of the constitutive behaviours exhibited by Polymer-Bonded Explosives (PBXs). ...
OpenForm - A New Intuitive Graphical User Interface for Industrial Forming Simulation
C. Kaulich, M. Wenzlaff (GNS mbH)
Since the mid nineties sheet metal forming simulation has been widely used to take the uncertainty out of the die design process. When forming simulation was first introduced into the work of die designers the main focus was on the prediction of thinning, cracking and draw-in of the sheet metal. Later, the prediction of wrinkling, springback and surface defects became challenges finite element forming simulation packages had to cope with. ...
Parametric Study for Evaluating Damageability of Automotive Radiator by Impacting Stones
S. Singh, M. Usman, J. Raver (Ford Motor Company)
The performance of automotive engines depends on the adequate heat rejection by radiator. The durability of radiator under all road conditions is an important consideration during the design and development stage, specifically protection of radiators from impacting road debris and stones. A parametric study was conducted to investigate the damageability of radiators by small stone impacts. In this paper, radiator design parameters are ...
Performance of LS-DYNA Concrete Constitutive Models
Y. Wu, J. E. Crawford, J. M. Magallanes (Karagozian & Case)
LS-DYNA provides several constitutive models for concrete. To provide some guidance in selecting a proper one for users who have limited experience on concrete, this paper reviews the background theory and evaluates the performance of three popular ones, namely, MAT072R3 (KCC), MAT084 (Winfrith), and MAT159 (CSCM). The basic performance of concrete constitutive models in capturing key concrete behaviors, such as post- peak softening, shear ...
Prediction of Failure Behaviors in Polymers Under Multiaxial Stress State
S. Hayashi (JSOL Corp.)
Polymers are used in an increasing number of automobile parts to improve occupant and pedestrian safety as well as reduce weight and cost. Under impact, these parts are designed to effectively absorb energy through large deformation and failure. Failure phenomena are very important to predict because structural strength is drastically changed or lost after failure occurs. In this study, puncture tests for polypropylene sheets were performed ...
Random Vibration Fatigue Analysis with LS-DYNA
A. Ringeval (CIMES), Y. Huang (LSTC)
Fatigue damage assessment for components under random cyclic loading is an important concern in engineering. A new feature of random vibration fatigue analysis has been implemented to LS-DYNA, to perform the structural fatigue analysis in a random vibration environment. This feature computes cumulative damage ratio and expected fatigue life for structures, based on the Palmgren-Miner’s rule of cumulative damage ratio and material’s ...
Recent advancements in LS-DYNA Pre-processing for Crash Simulation
Lambros Rorris, Athanasios Lioras, Yianni Kolokythas (BETA CAE Systems SA)
The increasingly demanding and complex requirements in Crash Analysis, call for continuous and innovative software development. BETA CAE Systems in an effort to meet and exceed the requirements of the industry is introducing new cutting edge technologies, in the pre-processing area with ANSA. This paper presents these new technologies. As CAE comes to maturity the challenges and requirements for the CAE preprocessing software also evolve. ...
Recent Developments and Roadmap - Conclusions
Dr. John O. Hallquist (LSTC)
Recent Developments and Roadmap Part 0: Introduction
Dr. John O. Hallquist (LSTC)
Recent Developments and Roadmap Part 1: LS-PrePost
Mr. Philip Ho (LSTC)
Recent Developments: LS-PrePost
Recent Developments and Roadmap Part 2: Dummy Models
Dr. Christoph Maurath (LSTC)
Recent Developments: Dummy Models
Recent Developments and Roadmap Part 3: Incompressible CFD
Dr. Facundo Del Pin (LSTC)
Recent Developments: Incompressible CFD
Recent Developments and Roadmap Part 4: Electromagnetics
Dr. Pierre L’Eplattenier (LSTC)
Recent Developments: Electromagnetics
Recent Developments and Roadmap Part 5: ALE, DEM, SPH, Particle
Dr. Jason Wang (LSTC)
Recent Developments: ALE, DEM, SPH, Particle
Recent Developments in Mechanical Characterization (Deformation and Failure) of Materials
A. Gilat, J. D. Seidt (Ohio State University)
Several new testing methods that have been recently developed for mechanical characterization (deformation and failure) of materials are presented. The data from these tests is used for the development and calibration of ®material models (constitutive relations) in LS-DYNA . The first method involves the use of Digital Image Correlation (DIC) in tests that are used for generating data needed for using the MAT224 model. In these ...
Recent Research and Developments of LS-DYNA's User Subroutine in JSTAMP/NV
T. Amaishi, N. Ma, Y. Umezu (JSOL Corporation)
Sheet metal forming simulation has been widely used in die design process, in order to make lightweight products ®and shorten production lead time. JSOL Corporation has been developing JSTAMP/NV since 1996 and continuously supplying the best stamping simulation environment for users. One of the most competitive advantages of JSTAMP/NV is its accuracy on the evaluation of formability when using explicit and implicit solutions in LS- ®DYNA . ...
Retrofitting of Reinforced Concrete Beam-Column via Steel Jackets against Close-in Detonation
S. H. Tan, J. K. Poon, R. Chan, D. Chng (Ministry of Home Affairs)
This paper presents results from simulation, in comparison to findings from full-scale blast trials of Reinforced Concrete Beam-Column test specimens. 2 numerical approaches were adopted. First method was a 2-stage approach which involved applying segment pressure loadings, derived from Computational Fluid Dynamics (CFD) ®calculations, on LS-DYNA Lagrangian models to predict structural response. Second method was the use ...
Rollover Simulations for Vehicles using Deformable Road Surfaces
T. Palmer (ETA), B. Honken (ETA), C. Chou (Wayne State University)
Vehicle Rollover simulations have been performed using LS-DYNA to predict both the vehicle dynamics and structural performance. However, these simulations do not consider a deformable road surface, affecting both the propensity of the vehicle to achieve a condition which will initiate a roll over or the effect of that surface to impart or mitigate damage to the structure. This study will highlight the capabilities of LS-DYNA for the ...
Script for Automated One Step Forming Analysis using LS-DYNA and LS-PrePost
A. Nair, D. Bhalsod (LSTC)
Mapping of metal forming data on metal parts for Crash Simulations helps to simulate the widely known effect of stiffer physical properties due to manufacturing processes. LS-Dyna® has enhanced the previously available capability to simulate one step analysis on metal parts and can use the existing finite element geometry taken from a full vehicle model. This method is quicker than running an incremental analysis for hundreds of parts which ...
Simulating the Joining of Composite Materials by Electromagnetic Induction
M. Duhovic, L. Moser, P. Mitschang, M. Maier (Institut für Verbundwerkstoffe GmbH), I. Caldichoury, P. L'Eplattenier (LSTC)
The development of the electromagnetism module in LS-DYNA (980 solver) was in the past primarily driven by the need for Electromagnetic Metal Forming (EMF) simulation capabilities. As the module matures, new applications in particular in the field of induction heating for thermoplastic composite welding/joining have appeared, providing a crucial simulation tool for composite manufacturing processes utilizing this technology. In this work, ...
Simulation and Test Validation of Windscreen Subject to Pedestrian Head Impact
Q. Liu, J. Liu, Q. Miao, D. Wang, X. Tang (SAIC Motor Technical Center)
Pedestrian head impact with windscreen is one of the major causes for pedestrian severe injury or fatality. A FE model is established with shell and solid elements representing different layers of a laminated windscreen. Major strain criterion is used to deal with the failure of windscreen. Simulation results are validated by Euro NCAP pedestrian head-to-windscreen impact tests. The results show that the FE modeling of windscreen can ...
Simulation for Forming and Performance Evaluation of Structures Developed Based on the Concept of "ORIGAMI Engineering"
Sunao Tokura (Tokura Simulation Research Corp.)
The “origami” is known as one of traditional Japanese craftwork. Origami is a technique of paper folding in which various complex shapes of birds, flowers and so on can be made from a simple sheet of paper. Origami is also considered as a technique to produce light weight three dimensional structures from two dimensional material. And the 3D structures of origami can be foldable and/or expandable. Recently origami engineering inspired by ...
Simulation of a Railgun: A Contribution to the Validation of the Electromagnetism Module in LS-DYNA v980
I. Caldichoury, P. L'Eplattenier (LSTC)
A railgun is an electrical gun using electromagnetic forces in order to accelerate and launch projectiles at several times the speed of sound. Railguns have long belonged to the science-fiction world or existed as experimental and demonstrator technology. However in recent years, the U.S Navy has shown an increased interest for Railguns as they offer the potential for reduced logistics and firing power. The purpose of this paper is to ...
Simulation of Ball Impact on Composite Plate with PP+30% LGF
T. Sakakibara, R. Akita, Y. Ohnishi (ITOCHU Techno-Solutions Corp.), S. Kijima, Y. Kanki (UES Software Asia Inc.), M. Seto (Kanazawa Institute of Technology), K. Suda, K. Yamakawa, Y. Ayano (Toray Eng. Co.)
The failure prediction of the long glass-fiber (LGF) reinforced resin is difficult because of the complicated fiber orientation compare to the short fiber. In order to establish a simulation procedure to represent the failure behavior of the LGF reinforced resin, we have carried out simulations of ball impact on the composite plate with ®polypropylene and 30% LGF using LS-DYNA coupled to DIGIMAT. The fiber orientation was calculated by ...
Simulation of Check Valve Flapper-Housing Impact Using LS-DYNA Fluid-Structure Interaction
S. Hu (Hamilton Sundstrand Corporation)
The flapper of a check valve in the aircraft air management system may hit the housing with a very high speed due to the sudden pressure differential caused by duct rupture, which may lead to the damage of the flapper. This event ®can be simulated using transient dynamic finite element tool, such as LS-DYNA . However, the flapper impact speed usually is unknown. The current study is focused on solving for the impact speed with the developed ...
Simulation of Impact Proof Testing of Electronic Sub-Systems
P. Glance (Naval Air Warfare Center Weapons Division)
The purpose of this paper is to document the development of a new simulation tool which is being employed to simulate the deceleration vs. time pulse imposed on electronic systems during impact tests as shown in Figure 1. The simulation tool has also been employed to predict the stress, strain, fracture, and structural failure of electronic sub-systems. Cannon tests and rocket propelled sled tests are the standard test methods employed to ...
Simulation of Loads from Drifting Ice Sheets on Offshore Structures
D. Hilding, J. Forsberg (DYNAmore Nordic AB), A. Gürtner (Statoil ASA)
In later years, there has been an increasing amount of work published regarding simulation of ice action on structures using finite element models of the ice. Here we will present results from a method development project aimed at evaluating the feasi- bility of full scale simulation of ice action from drifting ice sheets on offshore structures. The used methodology is presented including new developments, the implementation in ...
Simulation of Reinforced Concrete Structure under Impact Loading using Meshfree Cohesive Failure Approach
H. S. Lu, J. Y. Zhao (Shanghai Hengstar Technology Co), X. W. Wang, X. Lei (Shanghai Nuclear Engineering Research and Design Institute), C. T. Wu (LSTC), Y. C. Wu (Karagozian & Case)
Reliable numerical simulation of failure is important for the design and planning of new solids and structures, as well as for the safety assessment of existing ones. In the past two decades, gradient and non-local models for regularizing loss of ellipticity due to material failure using non-standard finite element method and more recently the meshfree method have been the topic of considerable research. Alternatively, discontinuous ...
Simulation of Warm Forming of Aluminium 5754 for Automotive Panels
T. Dutton (Dutton Simulation Ltd), M. Mohamed, J. Lin (Imperial College London)
The work described in this paper has been carried out as part of a project investigating implementation of an innovative metal forming process into the automotive industry to produce lightweight, high accuracy, complex-shaped automotive Aluminium panel components using one operation. The project, lasting three years, is a collaboration between industrial and academic partners lead by a Premium Automotive Manufacturer with funding from the UK ...