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11th International LS-DYNA Conference

LS-DYNA Implemented Multi-Layer Fabric Material Model Development for Engine Fragment Mitigation
S. D. Rajan, B. Mobasher, A. Vaidya - Arizona State University
The development of a robust and reliable material model for dry fabrics is the main subject of this paper. Dry fabrics are used in a number of applications such as propulsion engines fan-containment systems, and soft body armor. A mechanistic-based material behavior model capturing the behavior of fabrics when subjected to impacts from high-velocity projectiles would make a powerful predictive tool. In this paper, the constitutive model ...
LS-DYNA and JMAG Coupling Simulation for Change of SPM Motor Magnetic Properties Due to Press-Fitting
Kazuya Sato, Kazuyuki Narita, Hiroyuki Sano - JSOL Corporation
Press-fitting is one of the methods to keep the laminated structure of the motor core. It is known that the compressive stress due to press-fitting causes an increase of the core-losses. In this paper, the influence of the press- fitting stress on the motor magnetic properties was investigated using LS-DYNA and JMAG coupling simulation. JMAG is a comprehensive software suite for electromechanical equipment design and development. In ...
A Study of Mapping Technique for Air Blast Modeling
Vincent LAPOUJADE, Nicolas VAN DORSSELAER - Alliance Services Plus
Sandrine KEVORKIAN, Karine CHEVAL - Institut de Radioprotection et de Sûreté Nucléaire
Since LS-DYNA® v971 r4, a new 2D ALE method with an associated Mapping technique is available. Mapping enables the decomposition of a calculation in several steps: at the end of a 2D ALE calculation, data from the last cycle can be mapped into another 2D or 3D mesh. Several finite element studies of Air Blast were modeled to evaluate efficiency and potential of this new LS-DYNA feature. First, an influence study was performed to evaluate the ...
Fluid Structure Interaction (FSI) Applications to Consumer Products
Jean V. Seguro - The Procter & Gamble Co.
Manufacturing consumer products and among them disposable absorbent products is very complex, not only due to the number of components that are assembled together, modified and packed but also because it has to be done at very high speed in order to compete in the ever more competitive disposable absorbent products industry. Creating models to represent such complex processes is very challenging for the above reasons and others like the very ...
ALE Incompressible Fluid in LS-DYNA
Mhamed Souli - University of Lille
The computation of fluid forces acting on a rigid or deformable structure constitutes a major problem in fluid- structure interaction. However, the majority of numerical tests consists in using two different codes to separately solve pressure of the fluid and structural displacements. In this paper, a monolithic with an ALE formulation approach is used to implicitly calculate the pressure of an incompressible fluid applied to the structure. ...
A New Development in Pedestrian Safety: The FLEX-PLI GTR LS-DYNA Model
Chirag S. Shah, Fuchun Zhu, Roel Van De Velde, Robert Kant - First Technology Safety Systems
The lower limb is one of the most frequently injured body regions in crashes involving pedestrians. A biofidelic FLEXible-Pedestrian Legform Impactor Global Technical Regulations (FLEX-PLI GTR) device has been developed under directions of the Flex-PLI Technical Evaluation Group (FLEX-PLI TEG). First Technology Safety Systems (FTSS) is developing a LS-DYNA model in addition to the hardware counterpart. The FLEX-PLI GTR is the ...
WorldSID 50th vs. ES-2 A Comparison Based on Simulations
Sebastian Stahlschmidt, Alexander Gromer - DYNAmore GmbH
Matthias Walz - Daimler AG
For testing side impact performance of vehicles two recent male-sized dummies are available. Currently only the ES-2(re) is used in regulations and consumer test. It is expected that the WorldSID will be used for some load cases as substitute or in addition to the ES-2(re). Since only limited experience with the WorldSID is available, simulation is a ideal tool to face the upcoming challenge. The comparison employs detailed finite element ...
An Integrated Process for Occupant Safety Simulations with LS-DYNA & MADYMO Coupling
Cédric Canadas, Tom Van Langenhove, Christophe Liefooghe - LMS International
Paul van Catz, Peter Ritmeijer - TASS
This paper presents an innovative integrated process to perform occupant safety simulation with LS-Dyna & Madymo coupling. More than ever before, the automotive industry operates in a highly competitive environment. Manufacturers must deal with competitive pressure and with conflicting demands from customers and regulatory bodies regarding the vehicle functional performance, which forces them to develop products of increasing quality in even ...
New Features in LS-DYNA HYBRID Version
Nick Meng - Intel Corporation
Jason Wang, Satish Pathy - Livermore Software Technology Corporation
Numerical noise arising from different MPP core counts compels users to fix the number of cores used by LS- DYNA® MPP e.g. during a vehicle development program. This fixed core count limits job turn-around time and flexibility in managing computing resources. In addition, using a large number of cores for calculations diminishes scalability with pure MPP. LS-DYNA® HYBRID addresses these issues through the use of both MPI + OpenMP technology. ...
Usage of LS-DYNA in the Development of Professional Hammer Drills
A. Syma - Black & Decker GmbH
M. Hörmann - CADFEM GmbH
The development of modern electric power tools for professional use requires special attention. Characteristic aspects such as efficiency and user comfort along with robustness and durability are always of importance to the manufacturer. For the fulfillment of these attributes computer-aided simulation combined with the finite element software LS-DYNA® is a central point during the development process at Black & Decker GmbH, i.e. from ...
Modeling the Effects of Laser Peening on Friction Stir Welding Residual Stresses
Dr. Kelly Carney, Dr. Omar Hatamleh - NASA Glenn Research Center and Johnson Spaceflight Center
An analytical framework for predicting the residual stresses which result from the laser peening of a friction stir welded sample, using the finite element software LS-DYNA®, is presented, using a 2195 Aluminum alloy as an example. The pressures resulting from the laser peening are directly applied in an explicit transient analysis as forces. At the completion of the transient analysis, an implicit springback analysis is performed to ...
Process Modeling of Freeform Incremental Forming Using LS-DYNA
Feng Ren, Zhen Cui, Z. Cedric Xia - Ford Motor Company
Todd Slavik, Li Zhang and Xinhai Zhu - Livermore Software Technology Corporation
Incremental Sheet Forming (ISF) is a manufacturing process for sheet metal prototyping where the blank is incrementally deformed into a desired shape by one or more stylus tools traveling along a prescribed path. Conventional ISF can be categorized into two types, Single-Point Incremental Forming (SPIF) where the sheet metal is formed from one side by a single stylus tool; and Double-Point Incremental Forming (DPIF) where a die positioned ...
Finite Element Modeling and Validation of Guardrail Steel Post Deflecting in Soil at Varying Embedment Depths
Nauman M. Sheikh, Akram Y. Abu-Odeh, Roger P. Bligh - Texas A&M University System
This paper presents finite element modeling and validation of roadside guardrail steel posts deflecting in soil. The soil model was validated for posts embedded at various depths. Prior to finite element modeling, several drop- pendulum impact tests were conducted to determine the actual response of the soil-post interaction in dynamic impacts. A decrease in the depth of the post significantly increased the deflection in soil, which ...
Variable Screening Using Global Sensitivity Analysis
Tushar Goel, Christoph Maurath - Livermore Software Technology Corporation
The cost of optimization increases with the dimensionality of the problem irrespective of using metamodels or direct methods. It is recommended to explore the opportunities to reduce the number of variables. One method to reduce the dimensionality is to fix the variables that do not influence the response significantly. ANOVA based on polynomial response surfaces is often used to identify the least important design variables. The global ...
Recent Developments in JSTAMP/NV for the Best Stamping Simulation Environment
Yuji Kato, Yasuyoshi Umezu, Yuko Watanabe - JSOL Corporation
In recent years, expectations for stamping simulation systems have increased in stamping die design process, as the needs for lightweight products and short production lead time have grown. Aiming at the best stamping simulation environment, JSOL Corporation has been developing JSTAMP/NV since 1996. One of the most competitive advantages of JSTAMP/NV is accurate prediction of deformation and formability by explicit and implicit solutions in ...
Optimization Techniques in Conjunction with Complex ATD FE Models Using LS-DYNA
John Cooper, Dr. Hyunsok Pang, Matthew McCann, Dr. Ron Averill - Denton ATD, Inc and Red Cedar Technologies, Inc
This paper discusses the optimization methods used by Denton to create FE ATD models. Anthropomorphic Test Devices (ATDs also known as Dummies) are manufactured with a variety of hyperelastic and viscoelastic materials. The production processes used to manufacture ATD’s result in variations between dummies that can have a significant influence on dummy performance. In addition the load cases present during testing with ATDs are very complex ...
Response of the Enhanced Polar Outflow Probe (e-POP) Instrument Under Shock Loading
M. Nejad Ensan, D.G. Zimcik - National Research Council Canada
Spacecraft components encounter mechanical shock from a variety of sources. Components must withstand a series of flight shock pulses, and must be designed and tested accordingly to ensure reliability. This paper presents simulation of the response of the Enhanced Polar Outflow Probe (e-POP) instrument to the shock loading, during payload separation, using LS-DYNA® nonlinear finite element analysis software. Details of the model and ...
Applying the Dynamic Relaxation Step to Determine Influence on Global Model Response from Shock Tube Loading for Mounted Hybrid III Head Neck Assembly
Emily Ward, Tim Harrigan - The Johns Hopkins University
Blast-induced traumatic brain injury (bTBI) is a critical issue for warfighter protection. Since bTBI has many features in common with injuries due to impact loading, the Hybrid III crash test dummy can be used to study many aspects of this injury, and the head-neck assembly of the Hybrid III dummy can provide a relevant initial bench test for computational studies of traumatic brain injury. LS-DYNA® has provided finite element models (FEM) ...
Development of Hail Material Model for High Speed Impacts on Aircraft Engine
Yann CHUZEL,Alain COMBESCURE - LaMCoS INSA Lyon
Marco NUCCI, Yann PERRIN - Snecma Villaroche
Roland ORTIZ - Onera Lille
Hail impacts represent a threat for aircrafts and their engines. As experimental tests on aircraft engines are expensive and they can not be done in early stages of the development, numerical simulations to predict hailstone impacts on engine blades have to be developed. The purpose of this work is to present a new material model for simulating hailstone impacts on engine blades. Aeronautical industry has already developed numerical models ...
Validation of Material Models for the Numerical Simulation of Aluminum Foams
Marco Perillo, Vito Primavera - EnginSoft SpA
A. Carofalo, M. De Giorgi, R. Nobile - University of Salento
In the last years a lot of studies dealt with the material modeling of metallic foams, especially for the Aluminum ones. All these activities were performed especially for automotive field applications because the high energy- absorbing property of such foams fits very well the requirement to carry impacting loads efficiently. In spite of this, the industrial applications are not yet so widespread both for manufacturing costs and for a lack ...
Implementation of the Tanimura-Mimura's Strain Rate Dependent Constitutive Model in LS-DYNA Using User Defined Material Model
Dr. T. Tsuda - ITOCHU Techno-Solutions Corporation
Dr. S. Tanimura - Aichi University of Technology
Dr. A. Abe, Dr. M. Katayama, Dr. T. Sakakibara - ITOCHU Techno-Solutions Corporation
Tanimura-Mimura constitutive model covers a wide range of the strain rates and of a large strain, and enables us to use unified and common material constants to simulate the dynamic behaviors of materials and/or bodies. In this paper, dynamic behaviors of high speed tensile tests, buckling tests and crash test of a full vehicle are simulated by implementing this model in LS-DYNA®. Obtained numerical results are in good agreement with the ...
Solid Elements with Rotational Degree of Freedom for Grand Rotation Problems in LS-DYNA
Hailong Teng - Livermore Software Technology Corporation
The goal of this paper is to further enhance the solid elements with rotational degree of freedom (DOF). Three- dimensional finite elements with rotational degree of freedom have been proposed elsewhere, however, these elements are restricted to linear analysis. In this paper, by improving the mid-side node velocity update algorithm, we enhance the elements performance. Numerical results are presented, showing that the enhanced elements ...
Investigation of LS-DYNA Modeling for Active Muscle Tissue
Sebastian Mendes, Dr. Chiara Silvestri, Prof. Dr. Malcolm H. Ray - Worcester Polytechnic Institute
This study is aimed at investigating and comparing one-dimensional and three-dimensional finite element models of active muscle tissue. Skeletal muscle is a very complicated biological structure to model due to its non- homogeneous and non-linear material properties as well as its complex geometry. Additionally, forces generated from muscle activation are directly related to the muscle length and contraction velocity. Finite element ...
XFEM and EFG Cohesive Fracture Analysis for Brittle and Semi-Brittle Materials
Yong Guo, C.T. Wu - Livermore Software Technology Corporation
The finite element analysis of dynamic fracture in solids and structures is challenging due to the modeling of arbitrary crack growth in the continuum domain. The well-known mesh size and mesh orientation dependences add more difficulties into the analysis of this type of problems. In this presentation, we are going to introduce two numerical methods in modeling the dynamic fracture in brittle materials for solid and structures in LS-DYNA®. ...
Investigation of the Shear Thickening Fluid Dynamic Properties and its Influence on the Impact Resistance of Multilayered Fabric Composite Barrier
P.A. Mossakovsky - Moscow State University
A.M. Bragov - University of Nizhniy Novgorod
M.E. Kolotnikov, F.K. Antonov - FSUE "MMPP "Salut"
The results of experimental and computational study of properties of shear thickening fluid (STF) are observed. Two series of dynamic tests by the Split Hopkinson Pressure Bar method in rigid and soft casings are carried out to determine the dynamic bulk and shear properties of STF. A simplified mathematical model of the STF is formulated for the use in computer simulation of ballistic impact tests of multilayered fabric composite protective ...
Structure-Fluid Interaction Analysis of an Existing Water Tank
Mohammad Ghorbanie, Glen Norlander - AMEC Americas
An analytical study was completed investigating the cause and consequences of significant vibrations resulting from the operation of a hot water storage tank. Deformations and strain readings of the tank wall were measured during the operation and used to calibrate and validate results from the analytical model. The steel storage tank is supported on a concrete foundation. The diameter of the tank is 18 meters and the height is 28 meters. ...
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 ...
How to Use the New CESE Compressible Fluid Solver in LS-DYNA
Zeng-Chan Zhang - Livermore Software Technology Corporation
This new solver is based on the conservation element and solution element (CESE) method[1, 2]. The CESE method is a novel numerical method for solving conservation laws, and it has many nontraditional features, such as: space- time conservation; high accuracy (2nd order for both flow variables and their spatial derivatives); novel shock- o capturing strategy; both strong shocks and small disturbances can be handled very well simultaneously, ...
LSTC / NCAC Dummy Model Development
Pradeep Mohan, Chung-Kyu Park, Dhafer Marzougui, Cing-Dao Kan - The George Washington University
Sarba Guha, Christoph Maurath, Dilip Bhalsod - Livermore Software Technology Corporation
This paper presents the modeling and validation status of the most commonly used crash test dummies in the regulatory and consumer crash test programs, the Hybrid III family of crash test dummies. Systematic modeling and validation procedures are established and adopted to ensure the accuracy, efficiency, robustness, and ease of use of the models. The procedures are based on the premise that the model must be based on the fundamentals ...
An LS-DYNA Model for the Investigation of the Human Knee Joint Response to Axial Tibial Loadings
Dr. Chiara Silvestri, Doug Heath, Prof. Dr. Malcolm H. Ray - Worcester Polytechnic Institute
Automotive accidents frequently involve fracture of the knee joints which can be related to either bone or soft tissue injuries. Previous studies show that the degree of anterior-posterior constraint of the femur bone along its longitudinal axis plays a crucial role in determining the knee-joint-fracture mechanism and internal tibial-femoral load distribution. Also, the anatomical tilt of the tibial plateau, tibial-femoral joint compression ...
A Study on the Scalability of Hybrid LS-DYNA on Multicore Architectures
Yih-Yih Lin - Hewlett-Packard Company
In this paper, the effects of differences in problem size, number of cores per processor, and interconnect on the Hybrid LS-DYNA’s performance are studied. The result shows that combination of these three factors determines when Hybrid LS-DYNA has a performance advantage over the MPP LS-DYNA.
Mode-based Frequency Response Function and Steady State Dynamics in LS-DYNA
Yun Huang - Livermore Software Technology Corporation
Bor-Tsuen Wang - National Pingtung University of Science and Technology
Two new features used for frequency domain structural analysis --- frequency response function (FRF) and steady state dynamics (SSD), have been implemented in LS-DYNA, based on mode superposition techniques. As a characteristic of a structure, FRF is the transfer function which represents structural response resulting from applied unit harmonic excitations. The harmonic excitations can be given in the form of nodal force, base acceleration ...
An Improved 3D Adaptive EFG Method for Forging and Extrusion Analysis with Thermal Coupling in LS-DYNA
Hongshneg Lu - Shanghai Hengstar Technology Co. Ltd.
C. T. Wu - Livermore Software Technology Corporation
The 3D adaptive EFG method using conventional moving least-square approximation or fast transformation method [1] has been successfully applied to metal forging and extrusion analysis thanks to its high accuracy in dealing with large material deformation [2] in LS-DYNA. Recently, a meshfree convex approximation [3-5] was developed to be an alternative in the large deformation analysis. However, its application to the adaptive method has not ...
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