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Fast New Methodology for Regulatory Test Simulation
Velayudham Ganesan, David Piesko, Jean-Louis Duval - ESI Group
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Preparing a simulation model for a crashworthiness or occupant safety regulatory test is often a time consuming
task. This paper describes a new methodology that significantly reduces this modeling time, down to minutes.
Using predefined FMVSS standards, EASi-Process allows users to access ready made test templates for common
runs (such as FMVSS 201, 208, 581...). With the integration of EASi-Process, EASi-CRASH DYNA, premier pre
and post ...
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Rapid Development of Multiple Fold Patterns for Airbag Simulation in LS-DYNA Using Oasys Primer
Miles Thornton, Richard Sturt, Anastasia Kalabina - Arup
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The creation of folded meshes for airbag deployment simulations is a time consuming task. The fold pattern has a
significant effect on the speed and shape of deployment of the airbag, and therefore should be modelled when
prediction of deployment timing is required, as is the case with out of position analysis for FMVSS 208. To
investigate changes in fold patterns or airbag shape involves repeating the entire airbag mesh process for ...
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VPG Solutions Using MotionView
Michael White - Altair Engineering
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The MotionView® product has been extended in version 6.0 to support LS-DYNA input
and output. MotionView is a template based pre and post processor with a long history in the
automotive industry. An example of an automotive handling event, and several examples of
durability events will be shown. A vehicle model with a complete powertrain (engine and
transmission) will be simulated, to demonstrate the “plug and play” templated model ...
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Immersive Visualization and Collaboration with LS-PrePost-VR and LS-PrePost-Remote
Todd J. Furlong - Inv3rsion, LLC
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This paper describes two new branches of LS-PrePost that are designed to work together to extend LS-PrePost with
immersive visualization and collaboration capabilities.
LS-PrePost-VR supports immersive visualization on a wide range of immersive displays, including CAVE-like
devices, large-screen displays, and head-mounted displays. The software can run on either a single computer, a
visualization cluster, or an SMP machine. By itself, ...
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Computer Simulated and Experimental Verification of Tooling for Progressive Deep Drawing.
Peter Kostka, Peter Cekan - Slovak University of Technology in Bratislava
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The ability to predict different process conditions in deep drawing is essential for die face designers, tooling,
stamping and manufacturing engineers. These predictions in turn affect the speed, accuracy and cost of the final
produced product. This paper briefly discusses the possibilities of controlling the blankholder pressure distribution
and shows some computer simulations done in DYNAFORM, with the results being experimentally verified ...
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Learning Module for using Dynaform® to Study the Effects of Die-Entry and Punch-Nose Radii on Drawing Cups
W.K. Waldron, R. Echempati, C.J. Hoff, P. Zang - Kettering University
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The new model for an entry-level engineer in the United States automotive industry is that of a design engineer, one
who is capable of part design and analysis using advanced CAE tools such as solid-modeling, mechanical systems
dynamics (MSD), finite element analysis (FEA), and computational fluid dynamics (CFD). Since this will require a
major change and enhancement of the current undergraduate engineering curriculum, the Mechanical ...
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Simulation and Analysis of the Beverage Can Necking Process Using LS-DYNA
A. Jordan-Cordera, J.C. Miranda-Valenzuela - ITESM Campus Toluca
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Due to their large production quantities, beverage cans have been the subject of many studies. Such studies have as
objectives to increase the level of understanding of the structural behavior of the can as well as its manufacturing
process. In this work, the necking process is studied by means of a parameter response study carried out with the
help of LS-DYNA. Even when the necking process is affected by many factors including can geometry, ...
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Determination of Optimal Cutting Conditions in Orthogonal Metal Cutting Using LS-DYNA with Design of Experiments Approach.
David P. Masillamani, Jack Chessa - University of Texas at El Paso
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Optimal selections of cutting conditions contribute significantly to the increase in productivity and reduction in
costs of machining processes. The main objective of the present paper is to explore the resultant temperature formed
due to complicated interactions and between rake angle, depth of cut and cutting speed. Finite element simulations
using LS-DYNA is used as a numerical experiment in the construction of a Design of Experiment (DOE) ...
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An Eulerian Finite Element Model of the Metal Cutting Process
A. Raczy, W. J. Altenhof, A. T. Alpas - University of Windsor
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The Eulerian element formulation was employed in the modeling of the orthogonal metal cutting process of
commercial purity copper. The constitutive material models elastic-plastic hydrodynamic and Johnson-Cook, were
utilized in modeling the workpiece behavior. The capabilities of each model to replicate the experimental chip
geometry, stress and strain distributions, and cutting forces, were investigated. The numerical strain ...
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Review of Sheet Metal Forming Simulation Progress to Date, Future Developments
Trevor Dutton - Dutton Simulation Ltd
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Sheet metal forming simulation is a well established application of LS-DYNA. Originally used for trouble shooting,
it is now increasingly accepted as a method for testing tooling design prior to manufacture; however, there are
further opportunities to apply such methods as early as possible, even in the product design stage. This paper
reviews the advances of recent years and presents an example of typical current applications; the tools now ...
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FEA - Simulation of Bending Processes with LS-DYNA
Peter Gantner, Herbert Bauer - Aalen University, Germany
David K. Harrison, Anjali K. M. De Silva - Glasgow Caledonian University, United Kingdom
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Over the past few years new car body concepts have space frame structures. The consequent application of space
frames results in a reduction of weight, fuel consumption, and costs of a body while maintaining a high safety
standard. These structures consist mainly of closed profiles and hydroformed components. Prior to the
hydroforming process, the profiles are usually pre-bent. The bending of tubes is a crucial step in the ...
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Implicit and Explicit Finite Element Simulation of Soft-Pad Grinding of Silicon Wafers
A.H. Zhao , Z.J. Pei, X.J. Xin - Kansas State University
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Silicon wafers are used to fabricate more than 90% of all integrated circuits. Surface grinding is the preferred
technique used to flatten wire-sawn wafers. While conventional grinding is not effective in removing the waviness
induced by wire-sawing process, experiments and finite element analysis indicated that soft-pad grinding is a
promising method to remove waviness effectively. This paper presents the simulations of the process of the ...
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FEA - Calculation of the Hydroforming Process with LS-DYNA
Michael Keigler, Herbert Bauer - Aalen University, Germany
David K. Harrison, Anjali K. M. De Silva - Glasgow Caledonian University, United Kingdom
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The automotive industry is constantly searching for product improvements concerning weight reduction and the
need for corrosion resistance. Currently aluminium alloys are of special interest because of their low density of 2.76
g/cm3, and good corrosion resistance. The disadvantage of aluminium alloys is poor formability in comparison to
steel. Therefore, new forming methods are demanded such as the “tube hydroforming” process, which has ...
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Virtual Try Out and Process Optimization for an Innovative Conic Poles Production Concept
A. Anglani, G. Papadia - University of Lecce, Italy
A.Del Prete - Altair Engineering s.r.l.
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This paper describes how the production Process for conic poles has been reviewed in order to provide innovative
solutions for the forming process which has been considered the most critical operation. Finite Element Analysis
using an explicit code has provided a virtual way to investigate possible solutions evaluating advantages or
disadvantages before that any prototype tool has been developed. More than one solution was possible, FEA ...
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A Process of Decoupling and Developing Optimized Body Structure for Safety Performance
John M. Madakacherry, Martin B. Isaac, Dr. Charles A. Bruggeman - General Motors
Dr. David Eby - CD-Adapco
Dr. Akbar Farahani - ETA, Inc.
Dr. Ron C. Averill - Red Cedar Technology
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A large class vehicle meeting NCAP front crash and 40-mph 40% Offset Deformable Barrier (ODB) Impact
performance was modified and tested to verify a new load path strategy using hydroformed structure and new
analytical tools to reduce the mass of the vehicle while meeting the same or better performance as in the original
design. The new approach was used for developing the load path strategy of a complex system model by
decomposing it into ...
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FE Analysis of Contact Interaction Between Rigid Ball and Woven Structure in Impact Process
Alexey I. Borovkov, Igor B. Voinov - St.Petersburg State Polytechnical University
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The current paper presents the results of finite element solution of the problems simulating contact interaction
between woven structures and striker in the form of rigid ball. The woven structure is represented by a great number
of the fibers braided in such way that each of them can come into contact interaction with others. In this paper the
analysis results for ball impact direction effect on the woven structure dumping properties was ...
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Numerical Modeling of Ballistic Penetration of Long Rods into Ceramic/Metal Armors
Khodadad Vahedi, Najmeh Khazraiyan - Louisiana Tech University
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Penetration into ceramic/armor targets are of prime importance in research as well as industry and military
applications. The recent advances in this field shows considerable improvements in the design of armor and civilian
technology. Due to complexity of the problem and interdisciplinary of the subject, most of the works in this respect
are experimental in nature. The cost of experimentation is high and the results obtained cannot be ...
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Blast Impact on Aluminum Foam Composite Sandwich Panels
Rajan Sriram, Uday K. Vaidya - The University of Alabama at Birmingham
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Sandwich aluminum foam structures are being considered for energy absorption applications, crashworthiness,
protection of transformer housings, and structural safety. Blast loading is one such phenomenon that is a potential
threat to such structures. This study examines LS-DYNA modeling for aluminum foam sandwich composites
subjected to blast loads. The sandwich composite was designed using polymer composite facesheets and aluminum
foam as ...
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Predictive Numerical Modeling of Foreign Object Damage
Pierangelo Duó, David Nowell - University of Oxford
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During service aircraft engines may suffer foreign object damage (FOD) from ingestion of small hard
particles and then are subjected to a range of HCF-LCF cycles. Manufacturers are seeking to improve the FOD
tolerance of engines at the design stage and thereby reduce the costs of ownership. A design methodology is
therefore required with which to assess the loss of fatigue strength resulting from FOD on blades or vanes. This
work describes ...
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Simulation and Verification of the Drop Test of 3C Products
Hsing-Ling Wang - Chinese Air Force Academy
Shia-Chung Chen, Lei-Ti Huang, Ying Chieh Wang - Chung-Yuan Christian University
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Drop test performance has become one of the most crucial evaluations for Computer, Communication, and
Consumer (3C) products. Both simulation tool and practical platform for drop test must be established for detailed
study. A patented drop test platform is designed for the purpose of impact angle repeatability and instantaneous drop
image capture at impact instance. These parameters are two crucial computer-aid-engineering (CAE) inputs ...
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Drop Simulation for Portable Electronic Products
Raymon Ju, Brian Hsiao - Flotrend Co., Taiwan
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The portable electronic devices are becoming smaller and lighter in recent years, and hence these products are
easily damaged under the drop and impact conditions. Traditionally, manufacturers must have lots of mockups and
samples to simulate the impact behavior through experiment. To minimize the development period and the try-and-
error costs, ODMs in Taiwan begin to predict the impact behavior by LS-DYNA. For ODMs who want to ...
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Moving Beyond the Finite Elements, a Comparison Between the Finite Element Methods and Meshless Methods for a Ballistic Impact Simulation
Murat Buyuk, Cing-Dao Steve Kan, Nabih E. Bedewi - The George Washington University
Ali Durmus, Sedat Ulku - Uludag University
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For the past several decades, finite element techniques have been used extensively for the analysis of computational
solid mechanics problems. However, when the distortions become very severe, especially Lagrangian finite element
algorithms are not always adequate. More recently meshless methods (or particle methods) have been developed
and applied to solid mechanics problems since they can efficiently be used to represent severe distortions ...
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Simulation of Energy Absorbing Materials in Blast Loaded Structures
Michael J. Mullin, Brendan J. O’Toole - University Nevada Las Vegas
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Energy absorbing materials such as foam or honeycomb are of interest in blast protection because of their
ability to absorb energy through plastic deformation. After reaching their yield stress, these materials exhibit a
region of constant stress for increasing strain until the material is completely compacted. The energy needed to
crush the material is proportional to the area under the stress-strain curve. Because foams and honeycombs ...
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Explosive Welding of Light Weight Metal Sheets
Yamato MATSUI , Masahiko OTSUKA, Takeshi HINATA, Shigeru ITOH - Kumamoto University
Erik CARTON - TNO-Prins Maurits Laboratory
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The technique of explosive line welding is one of the processing techniques and it can connect
similar and dissimilar metal sheets using large energy of explosive during very short time. In this
study we try to weld lightweight metal sheets by experiment and work on the numerical
simulation concerning a series of the phenomenon. Materials involved are aluminum alloys
Al5052-O, 6061T6 and 6M83, magnesium alloy AZ31B-O and commercially pure ...
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Effects of Pre-Pressurization on Plastic Deformation of Blast-Loaded Square Aluminum Plates
R.L. Veldman, C. Clum, J. Folkert - Hope College
J. Ari-Gur - Western Michigan University
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The effects of static pre-pressurization on the blast-induced deformation of square
aluminum plates were studied both experimentally and numerically. In this study, small (0.152 x
0.152 x 0.0016 meter) clamped plates were used as a basic model of the fuselage skin of a
commercial aircraft. Both un-pressurized and pre-pressurized plates (static pressure of 62.1
KPa (9.0 psi)) were considered to simulate the minimum and maximum in-flight ...
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Transient Response of a Projectile in Gun Launch Simulation Using Lagrangian and ALE Methods
Ala Tabiei - University of Cincinnati
Mostafiz R. Chowdhury - U.S. Army Research Laboratory
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This paper describes the usefulness of Lagrangian and arbitrary Lagrangian/Eulerian (ALE)
methods in simulating the gun launch dynamics of a generic artillery component subjected to
launch simulation in an air gun test. Lagrangian and ALE methods are used to simulate the
impact mitigation environment in which the kinetic energy of a projectile is absorbed by the
crushing of an aluminum honeycomb mitigator. Issues related to the effectiveness ...
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Energy Absorbing Sandwich Structures Under Blast Loading
Dong Kwan (David) Lee, Brendan J. O’Toole - University of Nevada, Las Vegas
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A recent experimental study at the Army Research Laboratories shows that flat panels with various foam or
honeycomb faceplates transferred more energy to a structure under blast loading relative to a structure without an
energy absorbing faceplate. Ideally, the foam or honeycomb material should transfer less energy to the structure
since it absorbs energy while it deforms plastically. Non-uniform deformation of the energy absorbing material ...
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Preliminary Assessment of Non-Lagrangian Methods for Penetration Simulation
Leonard E. Schwer - Schwer Engineering and Consulting Services
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Lagrangian, Eulerian, and Smooth Particle Hydrodynamics formulations are applied to the simulation of a rigid
fragment impacting a concrete panel. An effort is made to keep much of the computational model constant across
the simulations. All three methods are shown to be appropriate for this class of ballistic impact simulation. The
results and conclusions are preliminary, but the paper serves as an introduction to these alternative forms ...
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Curved Barrier Impact of a NASCAR Series Stock Car
Eric A. Nelson, Li Hong - Altair Engineering
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A detailed finite element model of a NASCAR Series stock car has been developed by Altair Engineering and used to
study a curved barrier impact. This paper will review some of NASCAR’s capabilities in the area of motor sports
safety research and provide an overview of a study that has been performed by Altair Engineering. Specifically, the
author will compare and contrast results from a curved barrier impact in 3 different scenarios:
...
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Development of a Hybrid Energy Absorbing Reusable Terminal (HEART) Using Finite Element Modeling in LS-DYNA for Roadside Safety Applications
Nauman M. Sheikh, Dean C. Alberson, D. Lance Bullard - Texas Transportation Institute
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The Hybrid Energy Absorbing Reusable Terminal (HEART) is a newly developed crash cushion or an end terminal
to be used in highway safety applications that will mitigate injuries to occupants of errant vehicles.
The HEART is composed of corrugated plates of High Molecular Weight/High-Density Polyethylene (HMW/HDPE),
supported on steel diaphragms, which slide on a fixed rail. Kinetic energy from errant vehicles is converted to other
energy ...
