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7th European LS-DYNA Conference

A Numerical-Experimental Investigations on Crash Behaviour of Skin Panels during a Water Impact Comparing ALE and SPH Approaches
Eng. Edoardo Francesconi, Prof. Marco Anghileri - Politecnico di Milano
Water landings in emergency are likely to have tragic consequences for helicopters. Most of the safety devices developed to enhance helicopter crashworthiness have been designed referring to ground impacts and they might be not effective in case of water landings. At LAST, the crash labs of Politecnico di Milano, water impact drop tests were carried out to deepen the knowledge of the event dynamics and to collect reliable data to validate ...
New Features in LS-DYNA EFG Method for Solids and Structures Analysis
C. T. Wu - LSTC
In this presentation, an update on LS-DYAN EFG method for solids and structures analysis will be given. Several features were developed in the past two years to solve specific challenging problems as well as to improve the efficiency. This talk will emphasize on three new features including an adaptive Meshfree scheme based on a local Maximum Entropy approximation for metal forging and extrusion analysis, a semi-Lagrangain formulation in ...
ALE Formulation for the Evaluation of Seismic Behaviour of Anchored and Unanchored Tanks
Z. Ozdemir - Bogazici University / Université de Lille
M. Souli - Université de Lille
Y. Fahjan - Gebze Institute of Technology
Estimation of the potential degree of risk for tank failure during an earthquake is very difficult to quantify since the liquid-tank system possesses many different nonlinear behaviour mechanisms which may be triggered simultaneously or separately depending on the characteristics of earthquake, contained liquid properties, fluid depth, dimensions of the tank, roof type, material properties, supporting conditions and stiffness of underlying ...
ALUMINUM PLATE PERFORATION: A COMPARATIVE CASE STUDY USING LAGRANGE with EROSION, MULTI-MATERIAL ALE, and SMOOTH PARTICLE HYDRODYNAMICS
Leonard E Schwer - Schwer Engineering & Consulting Services
The focus of the present work is to perform an assessment of a relatively new class of numerical methods, referred to as meshfree methods, that offer analysts an alternate analytical technique for simulating this class of ballistic problems, without a priori trajectory knowledge, nor resorting to ad hoc criteria. The assessment is made by the comparison of projectile residual speeds provided by the various techniques, when used to simulate a ...
A Coupling of Empirical Explosive Blast Loads to ALE Air Domains in LS-DYNA
Todd P. Slavik - Livermore Software Technology Corporation
A coupling method recently implemented in LS-DYNA® allows empirical explosive blast loads to be applied to air domains treated with the multi-material arbitrary Lagrangian-Eulerian (ALE) formulation. Previously, when simulating structures subjected to blast loads, two methods of analysis were available: a purely Lagrangian approach or one involving the ALE and Lagrangian formulations coupled with a fluid-structure interaction (FSI) ...
Developing Failure Criteria for Application to Ship Structures Subjected To Explosive Blast Loadings
Mark Tyler-Street, Joke Luyten - TNO Defence
A research programme is being undertaken at TNO to investigate vulnerability reduction on warships. In this framework, studies have been performed regarding the structural damage due to both an internal missile explosion and close in explosions. Due to the severity of the explosive loadings the structural deformation is considerable and an accurate method to predict both the initiation and progression of material damage would be ...
Modelling of the dynamics of a 40 mm gun and ammunition system during firing
N. Eches, D.Cosson - Nexter Munitions
Q. Lambert - C.T.A. International
A. Langlet - C.T.A. International / Université d’Orléans
J. Renard - Université d’Orléans
This paper deals with the development of a finite element model of a 40 mm Case Telescoped Ammunition and its associated gun, able to describe the in-bore travel of the projectile during firing. This work is part of a PhD thesis, supervised by CTA International and the PRISME Institute, dedicated to the study of the parameters relevant to the accuracy of the Kinetic Energy Round. In order to conduct efficient parametric studies, they asked ...
Crash and Vibration Analysis of rotors in a Roots Vacuum Booster
Manuel Roth - Pfeiffer Vacuum GmbH
Stefan Kolling - Giessen University of Applied Sciences
The dynamic behaviour of a roots vacuum booster with two rotors is presented. The dynamic response of the structure is, thereby, investigated using an explicit analysis for the crash behaviour and an implicit analysis for the vibration behaviour. Typically the rotors run from 3000rpm to 3600rpm, but because of a desired rise in power density it is necessary to design rotors for operation at 6000rpm. With increasing rotational velocity the ...
Development of a Software for the Comparison of Curves During the Verification and Validation of Numerical Models
Mario Mongiardini, Malcolm H. Ray - Worcester Polytechnic Institute,
Marco Anghileri - Politecnico di Milano
This paper describes the development of the Roadside Safety Verification and Validation Program (RSVVP), a software that automatically assesses the similarities and differences between two curves. This program was developed to assist engineers and analysts in performing curve comparison during the verification and validation process of a numerical model. RSVVP was designed to automatically preprocess the two input curves to make them ...
Comparison of crash tests and simulations for various vehicle restraint systems
M. Massenzio, S. Ronel - Université de Lyon
C. Goubel - Université de Lyon / Laboratoire INRETS Equipements de la Route (LIER SA), Lyon Saint Exupéry Aéroport
E. Di Pasquale - SIMTECH
The use of computational mechanics methods is now largely adopted in the field of Road Side Safety. They are certainly interesting in the context a product development. However, the application of these methods in the certification process raises number of issues, addressed, among others, within the EU CEN TC226/WG1/TG1/CM-E, where some of the authors participate. This paper presents some crash test results and their related simulations, and ...
Simulation of a clamping ring under high dynamic loading
S. Edelmann, C. Groß, H. Chladek - INPROSIM GmbH
Clamping rings are used in a wide range of mechanical applications in order to assemble two or more cylindrical parts, e.g. tubes and pipes, pressure vessels and tanks. Another application area of clamping rings is in turbo engines, where they connect compressor, bearing and turbine casings for example. For normal operating conditions, standard rules or simple static analyses are adequate to determine the relevant design parameters of this ...
Verification of cylindrical interference fits under impact loads with LS-Dyna
Prof. Dr.-Ing. Helmut Behler, Jan Göbel, M.Eng. - Hochschule Mannheim
Steffen Heute, M.Eng. - Alpha Engineering Services GmbH
Interference fits are a commonly used means to couple shafts and wheels for example. The usual dimensioning is performed by a static verification. As long as the system geometry is not too complicated and the deformation is assumed to be linear elastic, the interference pressure can easily be calculated with the more familiar solutions of the equations of elasticity. The maximum static contact forces can be calculated together with an ...
Drop Test Analysis of a Lamy Pencil
Dr.-Ing Matthias Hörmann, Steffen Schiele - CADFEM GmbH
Reinhard Probol - LAMY GmbH
Consumer products like cell phones, personal digital assistants, dish washers or cookers, to name just a view of them, are often exposed to drop during transportation to the customer and during usage in life time. Pre-damage, failure or malfunction due to drop is typically not acceptable and will lead to refusal through the costumer in addition with a correspondingly amount of financial and prestige loss. The present work deals with the ...
Finite element modeling of the ITER superconducting cables mechanical behaviour using LS-DYNA code
A.S. Nemov , A.I. Borovkov - St.Petersburg State Polytechnical University
B.A. Schrefler - University of Padua
Superconducting cables are one of the key technical solutions used for generation of strong magnetic field in modern tokamaks. It is very important for engineers to be able to predict the mechanical deformations of superconducting cables because superconductivity depends on strains, temperature and magnetic field. Superconducting cables for ITER the International Thermonuclear Experimental Reactor [1] currently under construction, ...
High-Mass, Low-Velocity Impacts on Reinforced Concrete Slabs
A. J. Sangi, I. M. May- Heriot-Watt University Edinburgh
The behaviour of reinforced concrete in quasi static regimes has been investigated extensively but there have been few investigations into its transient behaviour, especially under low velocity regimes. This paper describes the finite element modelling and analysis of reinforced concrete slabs under drop-weight impact loads using LS-DYNA. The results obtained from the numerical simulations have been compared with tests that were carried out ...
SPH Simulations of High Velocity Impacts on Concrete Plate
Dr. Tatsuo Sakakibara, Dr. Toru Tsuda and Ryo Ohtagaki - ITOCHU Techno-Solutions Corporation
The local damages of the concrete plate are produced by high velocity impact of rigid projectile. In order to represent the cracking or perforation behaviours of the concrete, SPH is appropriate method because of completely mesh free. In this paper, SPH simulations for the local damage of the concrete plate due to high velocity impacts are performed to study the effects of the impact velocity and the strength of the concrete plate. To ...
Strain Rate Induced Strength Enhancement in Concrete: Much ado about Nothing?
Leonard E Schwer - Schwer Engineering & Consulting Services
When concrete impact and penetration simulations are discussed, the question of increased strength due to high strain rates arises. Many concrete material modelers cite and use the seminal work of Bischoff and Perry (1991), or the widely accepted standard reference for concrete Comite Euro-International du Beton (1993) or CEB for short. Bischoff and Perry amassed a large amount of concrete laboratory data addressing strain-rate induced Dynamic ...
LS-DYNA Productivity and Power-aware Simulations in Cluster Environments
Gilad Shainer, Tong Liu - Mellanox Technologies
Jacob Liberman, Jeff Layton, Onur Celebioglu - Dell, Inc.
Scot A. Schultz, Joshua Mora, David Cownie - Advanced Micro Devices (AMD)
Ron Van Holst - Platform Computing
From concept to engineering and from design to test and manufacturing; engineering relies on powerful virtual development solutions. Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) are used in an effort to secure quality and speed up the development process. Cluster solutions maximize the total value of ownership for FEA and CFD environments and extend innovation in virtual product development. Multi-core cluster ...
CAE Data Management from a single Geometry Revision to multi-disciplinary Simulation Results
Jens Philippeit, Zoran Petrovic - Siemens Product Lifecycle Management Software
Development processes for more complex new products and better performance require necessarily verification through digital simulation. Due to shortened development cycles the time to answer questions about reliable product characteristics is cut off and an efficient change management has to be established in the process chain from CAD to CAE. Normally CAE processes start with CAD data from a PDM system. To start CAE analysis it is ...
Latest developments in Crash Pre Processing and Post Processing. Innovative Ideas brought to the Industry with ANSA and μETA.
L. Rorris, D. Siskos, Y. Kolokythas - BETA CAE Systems SA
The increasingly demanding and complex requirements in Crash Analysis, require continues and innovative software development. BETA CAE Systems in an effort to meet, and exceed, the demands 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 ...
Performance of the Hybrid LS-DYNA on Crash Simulation with the Multicore Architecture
Yih-Yih Lin - Hewlett-Packard Company
Jason Wang - Livermore Software Technology Corporation
Using crash simulation models, we investigate the multicore performance of the newly developed hybrid LS-DYNA, a method whose speedup arises from both shared-memory and message-passing parallelisms. Theoretically, the hybrid method gains performance advantages over the traditional, message-passing-parallel (MPP) LS-DYNA for two reasons. First, the addition of shared-memory parallelism to the message-passing parallelism reduces the number of ...
Computing on GPUs
Prof. Dr. Uli Göhner - DYNAmore GmbH
The increasing power of GPUs has led to the intent to transfer computing load from CPUs to GPUs. A first example has been the porting of computing intensive algorithms like e.g. ray-tracing algorithms from CPU to GPU. Through the Compute Unified Device Architecture (CUDA [4]) GPUs can also be used to increase computing speed for High Performance Computing applications. In this paper different parallelization strategies for different ...
Cluster Scalability of Implicit and Implicit-Explicit LS-DYNA Simulations Using a Parallel File System
Mr. Stan Posey, Dr. Bill Loewe - Panasas Inc.
Dr. Paul Calleja - University of Cambridge
The parallel efficiency and simulation turn-around times of CAE software continue to be an important factor behind engineering and scientific decisions to develop models at higher fidelity. Most parallel LS-DYNA simulations use scalable Linux clusters for their demanding HPC requirements, but for certain classes of FEA models, data IO can severely degrade overall scalability and limit CAE effectiveness. As LS-DYNA model sizes grow and the ...
Handling of large LS-Dyna Full Vehicle Crash Models with TECOSIM-advanced inhouse process Tools
D. Lopez, U. Jankowski, S. Oldenburg - TECOSIM GmbH
Based on several years of CAE experience TECOSIM has developed an advanced inhouse CAE process. Each TECOSIM tool was developed on the basis of TECOSIM internal projects as well as several projects carried out successfully at customers’ site. All tools used in this process are able to run as stand-alone solutions, but the combination of them provides a very effective CAE process, thus reducing the entire vehicle development cost. The TECOSIM ...
A Next Generation Software Platform for LS-DYNA Modeling and Configurable Vertical Application Development
H. Ouyang, Tim Palmer, Q. He - Engineering Technology Associates, Inc.
Finite element modeling tools have undergone a transformation in recent years. These tools have been made easier to use, configurable for vertical applications and able to interact with outside applications. Such software needs to not only efficiently create models, but are also expected to interact with other software tools, be configurable and anticipate the future needs of users by being able to extend the users ability to assimilate ...
Global Sensitivity Analysis in Structural Optimization
Uwe Reuter - TU Dresden
Martin Liebscher, Heiner Müllerschön - DYNAmore GmbH
The main purpose of global sensitivity analysis is to identify the most significant model parameters affect- ing a specific model response. This helps engineers to improve the model understanding and provides valueable information to reduce the computational effort in structural optimization. A structural optimiza- tion is characterized by a set of design parameters, constraints and objective functions formulated on basis of model responses. ...
Early Design Validation of Vehicle Interiors for FMVSS 201 using IHIT and LS-DYNA
Arun Chickmenahalli - International Automotive Components
Suthy C. Sivalingam - ESI North America
Thomas Weninger - ESI-Group
 
Hewlett Packard - Simulation Drives Move to Virtual Prototyping
Surviving the economic slowdown by increasing cost-saving technology: Don’t spend more; spend more effectively Today’s trends - more complex features, increased global competition, and more government regulations - increase automakers’ reliance on CAE simulations HP and Intel help automakers maneuver through the obstacles by providing innovative technologies that boost computational performance and lower costs
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