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11th International LS-DYNA Conference

An Assessment of the New LS-DYNA® Multi-Layered Solid Element: Basics, Patch Simulation and its Potential for Thick Composite Structural Analysis
Thorsten Schütz - Adam Opel GmbH
Anton Matzenmiller - Univ. of Kassel
Madhukar Chatiri - CADFEM GmbH
Limitation of fossil fuels and global warming favor the introduction of new powertrain concepts for road vehicles with highest efficiency and low greenhouse gas emissions. Fuel cell vehicles offer the highest potential for sustainable mobility in the future. One major component of fuel cell vehicles is the hydrogen storage system. A promising and currently the most-used approach is to store hydrogen in wet-wound carbon fiber reinforced ...
LS-DYNA Durability Load Cases: An Automated Template Driven Process Using the ANSA Task Manager
Yianni Kolokythas - BETA CAE Systems SA
Dietmar Fels, Matthias Weinert - Ford-Werke GmbH
Process organization and standardization are essential in a CAE turnaround cycle. In an era, where the vehicle development time is getting reduced and the number of load case analysis is getting increased, the need for automatic standard processes is increasing. Ford-Werke GmbH and BETA CAE Systems SA are cooperating to develop streamlined, automatic processes, using the ANSA Task Manager. The goal, of these template driven processes, are to ...
LS-DYNA "Model Compare" in Visual-Environment
Shivakumara H. Shetty, Velayudham Ganesa - ESI Group
Milind Parab - Mindware
Sreedhar Kandagatla - ESI Software (India) Pvt Ltd
A downturn in the industry drives companies to execute projects with fewer resources. The demand for product innovation and productivity improvements has increased exponentially. In order to meet the customers’ demand, ESI’s Visual-Environment provides new features and improvements to achieve productivity, better usability and workflow. One such new feature is “Model Compare”. Using “Model Compare”, a user can compare models to identify the ...
On the Prony Relaxation Function
William W. Feng, John O. Hallquist - Livermore Software Technology Corp.
For solving viscoelastic problems, the constitutive equations involve convolution integrals with relaxation functions. The relaxation function, G (t ) , is often written in Prony series...
Recent Improvements to Release III of the K&C Concrete Model
Joseph M. Magallanes, Youcai Wu, John E. Crawford - Karagozian & Case
L. Javier Malvar - Naval Facilities Engineering Service Center
Recent improvements are made to Release III of the Karagozian & Case (K&C) concrete model. This three- invariant plasticity and damage-based constitutive model is widely used to model a number of materials, including normal and lightweight concrete, concrete masonry, and brick masonry, to compute the effects of quasi-static, blast, and impact loads on structures. This most recent version of the model, made available starting with ...
Stone Skipping Simulation by ALE and SPH
Mitsuhiro Makino - Dynapower Corporation
Stone skipping is the play at sea shore and river. The flat stone, which is thrown, skips on the surface of water. This phenomena is simulated by ALE and SPH capability of LS-DYNA®. The dependency of the parameters such as the angle between stone and water, incident angle of stone will discuss.
A Contribution to New ALE 2D Method Validation
Nicolas VAN DORSSELAER, Vincent LAPOUJADE - Alliance Services Plus,
Since LS-DYNA® v971 r4, a new ALE 2D method is available. Several finite element studies were performed by AS+ to evaluate the precision of this method in pure Multi-Materials Euler studies . Pure Multi-Materials Euler was tested on Impacts and Explosives studies from Defense and Spatial fields. A High Velocity Impact, a Long Rod Penetration, an Explosively Formed Projectile, a Shaped Charge Jet and an Air Blast were modeled using 2D ...
Using LS-DYNA to Computationally Assess the V0-V100 Impact Response of Flexible Fabrics Through Probabilistic Methods
Gaurav Nilakantan, Michael Keefe, John W. Gillespie Jr. - University of Delaware
Eric D. Wetzel, Travis A. Bogetti, Rob Adkinson - US Army Research Laboratory
The probabilistic nature of the impact performance of flexible woven fabrics arises from a number of sources. The statistical nature of yarn tensile strengths on impact response is modeled in this study. Currently the probability of penetration of a fabric at a given velocity (Vx is the impact velocity having a probability of penetration of x ranging from 0 to 100%) is determined experimentally, by shooting fabric panels over a range of ...
Simulation of Granular Ceramic Armor Under Impact from Bullets
James G. McLean, Seth Frutiger, Robert Dabek, Jeremy Reeves - State University of New York at Geneseo
Ballistic impact is studied for a novel form of armor, granular ceramic armor. Ceramic granules, in the millimeter size range, are closely packed and bonded together using a relatively soft polymer. This composite layer rests on a rigid backing. In field tests such panels have already shown the capability to stop armor piercing rifle rounds. The goal of the study is to determine the detailed mechanisms of energy and momentum dissipation. ...
Experimental and Numerical Testing of the V50 Impact Response of Flexible Fabrics: Addressing the Effects of Fabric Boundary Slippage
Gaurav Nilakantan, Michael Keefe, John W. Gillespie Jr. - University of Delaware
Eric D. Wetzel, Richard Merrill, Travis A. Bogetti, Rob Adkinson - US Army Research Laboratory
The impact testing of woven fabrics comprised of high strength and high modulus yarns is probabilistic in nature. This paper presents results from the experimental impact testing of 50.8 mm×50.8 mm scoured Kevlar S706 fabric samples held on four sides and impacted at the center by a 0.22 caliber ball bearing projectile. The V50 velocity response is obtained by performing impact experiments over a range of velocities and fitting the data to a ...
Module Development of Multiphase and Chemically Reacting Flow in LS-DYNA® Compressible Flow Solver
Kyoung-Su Im, Zeng-Chan Zhang, Grant Cook, Jr. - Livermore Software Technology Corp.
We reported a significant progress of the simulation module developments such as the cavitation, supersonic heterogeneous combustion, and gaseous detonations for the compressible flow solver. The homogeneous equilibrium model (HEM) based on the acoustic speed of the mixture of liquid and vapor was implemented for automotive diesel injectors, where the cavitation effects should correctly predict for the nozzle design. The heterogeneous ...
The Potential Impact of GPUs on LS-DYNA Implicit
Roger Grimes, Robert Lucas, and Gene Wagenbreth - Livermore Software Technology Corp.
This talk will report the on-going efforts of LSTC to study the impact of GPUs on LS-DYNA. GPUs offer very high performance computational power at the cost of importing and exporting of data between the host computer and the GPU. The GPU has restricted memory, requires programming in a special language, and suffers performance reduction for double precision arithmetic. Still GPUs appear to offer a potential speed-up of a factor of 2 to ...
LS-DYNA Best-Practices: Networking, MPI and Parallel File System Effect on LS-DYNA Performance
Gilad Shainer - HPC Advisory Council
Tong Liu - Mellanox Technologies
Jeff Layton, Onur Celebioglu - Dell
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 ...
FE Modeling of Innovative Helmet Liners
D. Hailoua Blanco, A. Cernicchi - Dainese S.p.a
U. Galvanetto - University of Padua
A key component of a safety helmet is the energy absorbing liner, which absorbs the greatest portion of impact energy during an accident. The aim of the present work was to study innovative structures for energy absorption that minimize the likelihood of head injuries for standard impact cases. The innovative helmet liner consists of an ABS plastic lamina with deformable cones on it. Energy is absorbed via a combination of folding and ...
Analysis and Design of Large-Scale Civil Works Structures Using LS-DYNA
David DePolo, Eric Kennedy, Thomas Walker, Ryan Tom - US Army Corps of Engineers
The Folsom Joint Federal Project (JFP) Auxiliary Spillway is a high profile addition to the Folsom Dam, located approximately thirty miles upstream of Sacramento, California. Total concrete placements on the project will exceed 140,000 cubic yards at a projected cost of nearly $1 billion. The main component of the JFP is a large concrete control structure with steel bulkhead gates, submerged tainter gates, and post-tensioned anchorage. As ...
LS-DYNA Meshfree Interactive Adaptivity and Its Application
Wei Hu, C. T. Wu - Livermore Software Technology Corporation
Kei Saito - Engineering Technology Division, JSOL Corporation
The meshfree adaptive method has been developed and widely used as an important tool to deal with large topology change with severe local deformation in the application of 3D metal forming analysis. However, due to the complexity of material deformation, it is impractical to predefine the adaptivity before the actual analysis is performed. The interactive adaptivity will be an alternative to dynamically detect distortion and maintain the ...
Numerical Simulation and Experimental Study of Electromagnetic Forming
Jianhui Shang, Larry Wilkerson, Steve Hatkevich - American Trim LLC
Pierre L’Eplattenier - Livermore Software Technology Corporation
Compared to traditional sheet metal forming, electromagnetic forming (EMF) has several advantages, such as increased formability, cost savings and improved flexibility. There are many EMF applications in sheet meal forming, especially for aluminum alloys, because aluminum alloys have relatively low formability and high conductivity when compared to steel. The EMF process uses magnetic field generated by a conductive actuator upon large ...
Bolted Joint Representation in LS-DYNA to Model Bolt Pre-Stress and Bolt Failure Characteristics in Crash Simulations
Shailesh Narkhede, Nitin Lokhande, Bhavesh Gangani, Ganesh Gadekar - Tata Motors Ltd.
During the vehicle crash event (especially vehicles involving light and heavy commercial vehicles where bolted connections are predominantly used) bolted joints behavior, in terms of deformation and failure, play significant role in detecting the level of occupant protection offered by the vehicle structure. The current FE modeling techniques, for bolted joint representation in crash FE models, pose various limitations in terms of simulating ...
Vehicle Structures Experimental Analyses
Moisey B. Shkolnikov
This paper is a summary of previous developments, publications and usage of special strain gages sets (referred to here as experimental finite elements, FEs) in experimental analyses of vehicle structures. The experimental FEs developments were based on Structural Mechanics, Math Statistic theories and experience of their applications in vehicle structures analyses and tests. The summary’s objective is to describe the LS-DYNA® optional ...
Latest Developments in Crash Pre Processing and Post Processing - Innovative Ideas Brought to the Industry
L. Rorris - 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, both in the pre-processing area with ANSA, and in post-processing with μETA. This paper presents these new technologies. With the introduction of a new version of ANSA in 2009 a new user ...
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