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13th International LS-DYNA Conference

A Finite Element Model of THOR Mod Kit Dummy for Aerospace Impact Applications
Costin D. Untaroiu, Jacob B. Putnam (Virginia Tech)
Jeff T. Somers (Wyle Science)
New spaceflight vehicles are currently being developed to transport crews to space by NASA and several commercial companies. During the launch, and landing phase, vehicle occupants are typically exposed to spinal and frontal loading. To reduce the risk of injuries during these common impact scenarios, NASA has begun research to develop new safety standards for spaceflight. The THOR, an advanced multi-directional crash test dummy, was chosen to ...
A New Heat Transfer Capability Between CPM Gas and Its Surroundings
Sheng Peng (LSTC)
Corpuscular particle method (CPM) was developed for airbag deployment simulations. It took into account specifics like airbag folding technique, vent hole design, and interaction between discretized gas flow and airbag fabric to capture the effects of dummy impact on airbags, both fully inflated and out-of-position. It’s numerically very robust and the particle-based nature leads to elegant treatment of venting, porous leakage and gas mixing. ...
A New Way for the Adaption of Inverse Identified GTN-Parameters to Bending Processes
Ioannis Tsoupis, Marion Merklein (Friedrich-Alexander-Universität Erlangen-Nürnberg)
One major challenge in metal forming exists in sheet metal bending of modern lightweight materials like high‑strength low-alloyed steels (HSLA), since conventional methods of predicting failure in numerical simulation, like the forming limit diagram (FLD), can generally not be applied to bending processes. Moreover, fracture mechanisms are mainly depending on the microstructure, which is very fine-grained in HSLA steels composed with different ...
A Simple Weak-Field Coupling Benchmark Test of the Electromagnetic-Thermal-Structural Solution Capabilities of LS-DYNA Using Parallel Current Wires
William Lawson, Anthony Johnson (General Atomics Electromagnetics)
To begin learning the coupled field capability of LS-DYNA and validate results, a simple simulation of parallel wires carrying current was run. The magnitude of the current in the wires is such that the coupling between the electromagnetic (EM), thermal and structural fields is weak, in the sense that the coupling is taken to be one way. That is, there is no feedback amongst the three field solutions. This allows us to compare LS-DYNA code ...
A Study on Preparation of Failure Parameters for Ductile Polymers
Kunio Takekoshi, Kazukuni Niwa (TERRABYTE Co., Ltd)
A study on preparation method of failure parameters for ductile polymers is presented using experimental results of high-speed tensile test for Polycarbonate and simulation results based on Semi-Analytical Model for Polymers (SAMP) constitutive model [1] in LS-DYNA®. In addition, a comparative review of two widely used failure models, namely, total formulation and incremental formulation [2, 3], is carried out using Charpy impact test ...
Accelerating Implicit LS-DYNA® with GPU
Yih-Yih Lin (Hewlett-Packard Company)
A major hindrance to the widespread use of Implicit LS-DYNA is its high compute cost. This paper will show modern GPU, cooperating with CPU, can help remove this hindrance. Performance improvement for Implicit LS-DYNA with GPU relative to that without, as well as from recent GPU and X86 processor, will be studied. The study will cover GPU related hardware issues, including GPU Boost, memory and PCI Express Interface.
Accuracy Issues in the Simulation of Quasi-Static Experiments for the Purpose of Mesh Regularization
Anthony Smith (Honda R & D Americas Inc. )
Paul Du Bois (LS-DYNA® Consultant)
Generating an LS-DYNA® material model from coupon-level quasi-static experimental data, developing appropriate failure characteristics, and scaling these characteristics to mesh sizes appropriate for a variety of simulation models requires a regularization procedure. During an investigation of an anisotropic material model for extruded aluminum, numerical accuracy issues led to unrealistic mesh regularization curves and non-physical simulation ...
Adaptive Smoothed Particle Hydrodynamics Neighbor Search Algorithm for Large Plastic Deformation Computational Solid Mechanics
Kirk Fraser (University of Quebec at Chicoutimi)
Smoothed Particle Hydrodynamics (SPH) has quickly become one of the most popular mesh-free methods since its introduction in 1977. In the recent years, a great amount of research has been focused on addressing some of the common computational time associated with the SPH method. One of the remaining hurdles is the long computational associated with building the neighbor list. Because of the nature of the original SPH codes (astropyshics), the ...
Advanced MPP Decomposition of a SPH Model
Christian MOUTELIERE, Vincent LAPOUJADE (DynaS+)
Antoine MILLECAMPS (SNECMA)
SPH, Smoothed Particle Hydrodynamics, is a very efficient tool to model industrial problems where large deformations occur. However, one disadvantage of the SPH technique is the relative expensive cpu cost compared to standard Finite Elements. Using the MPP version of LS-DYNA® allows users to handle larger problems (up to more than millions of particles) in a reasonable time. Due to the meshfree nature of the SPH method, standard ...
Advanced Simulation of Polymer Composite SMC Compression Molding using Fluid-Structure Interaction in LS-DYNA®
Dominic Schommer, Miro Duhovic, Florian Gortner, Martin Maier (Institut für Verbundwerkstoffe GmbH)
Thermoset Sheet Molding Compounds (SMC) are becoming more and more popular as lightweight construction materials in the automotive industry. SMC compression molding is a forming process in which a pre-cut SMC-Prepreg is placed within a heated mold and is first pressed into shape before being cured. By closing the mold, the thermoset resin is forced to flow and takes the randomly orientated fiber reinforcement present, along with it. The flow ...
Advances in LS-DYNA® Metal Forming (I)
Xinhai Zhu & Li Zhang (LSTC)
Some of the new features developed since the last conference will be discussed. 1) Gaging pin contact improvement New contact treatment for edge contact between gaging pin and sheet blank edge during gravity loading. 2) Output control for parameterized input Specifying D3PLOT and INTFORC outputs made easy for parameterized input. 3) Gravity loading – switching between implicit dynamic and implicit static Taking advantage of the best ...
Advances in LS-DYNA® Metal Forming (II)
Li Zhang & Xinhai Zhu (LSTC)
Some of the new features developed since the last conference will be discussed. 1) Lancing – instant and progressive Cutting of sheet metal during forming to alleviate thinning and splits. 2) Auto close of open trim curve loop Improvement in trimming simulation by automatically closing an open trim curve. 3) Tailor-rolled blank thickness specification Specification of thickness field of a tailor-rolled blank for any ensuing ...
Advances in Simulating Corrugated Beam Barriers under Vehicular Impact
Akram Abu-Odeh (Texas A&M Transportation Institute)
W-beam guardrail systems are the most common roadside railing systems used by many road authorities worldwide. They have been used for decades as roadside barrier to protect errant vehicles from intruding into hazardous areas. This paper gives a description of this rail system and recent methods to simulate its performance under roadside impacts. The availability of simulation technologies such as LS-DYNA® makes it possible to evaluate the ...
An Adaptive Meshfree Galerkin Method for the Three-dimensional Thermo-mechanical Flow Simulation of Friction Stir Welding Process
C.T. Wu, W. Hu (LSTC)
H.P. Wang (GM Research and Development Center)
In this paper, new numerical modeling of material flow in the thermo-mechanical friction stir welding process is presented. In this numerical model, the discretization in space is derived by the meshfree Galerkin method using a Lagrangian meshfree convex approximation. The discrete thermal and mechanical equations are weakly coupled as the time advances using a forward difference scheme. A mortar contact algorithm is employed to model the ...
An Enhanced Bond Model for Discrete Element Method for Heterogeneous Materials
Zhidong Han, Hailong Teng and Jason Wang (LSTC)
The enhanced bond model allows the Discrete Element Method (DEM) to simulate the heterogeneity and discontinuity at the individual particle level at the micro level. The traditional material models at the macro level are applied to each particle independently. This bond model bridges the behaviors of particles at macro and micro levels, and may be used for failure analysis of the homogeneous & heterogeneous materials, including composites, ...
An Introduction to the LS-DYNA® Smoothed Particle Galerkin Method for Severe Deformation and Failure Analyses in Solids
C. T. Wu, Y. Guo, W. Hu (LSTC)
This paper presents a new particle method in LS-DYNA for the severe deformation and failure analyses of solid mechanics problems. The new formulation is first established following a standard meshfree Galerkin approach for a solving of the partial differential equation of a linear elastic problem. A smoothed displacement field is introduced to the Galerkin formulation and leads to a regularized smoothed strain approximation. The resultant ...
Analysis and Design of a Unique Security Bollard Installment Using LS-DYNA® for a K12 Vehicle Impact
Joseph M. Dulka, Eric R. Dietrich, Kelley S. Elmore, Kendra D. Jones, Clyde S. Harmes, Robert H. Moyer (elmore engineering)
This paper presents the design process for a unique security bollard providing protection against a K12 [1] (M50 [2]) vehicle crash load. LS-DYNA was used to aid in the design of the security bollard to account for the highly dynamic and inelastic behavior during a vehicle impact. The bollard was installed along the top of a wall for a below-grade courtyard in order to maintain a building security perimeter, providing protection against a ...
Analysis of Unsteady Aerodynamics of a Car Model in Dynamic Pitching Motion Using LS-DYNA® R7
Yusuke Nakae, Tsuyoshi Yasuki, Hiroshi Tanaka, Jiro Takamitsu (Toyota Motor Corporation)
This paper describes the numerical analysis of unsteady aerodynamics of a car model in dynamic pitching motion using LS-DYNA R7. Large-Eddy simulations with ALE method were performed to clarify the effects of unsteady aerodynamic forces on aerodynamic characteristics of cars in dynamic motion. The forced sinusoidal pitching oscillation was imposed on the 1/4 scaled car model and the flow velocity was set to 27.78 m/s. The model was based on a ...
Application and CAE Simulation of Over Molded Short and Continuous Fiber Thermoplastic Composite
Helga Kuhlmann, Pieter Volgers, Zhenyu Zhang (DuPont)
In the field of structural design, from aerospace and automotive to consumer packaging, numerical structural analysis using the finite element method (FEM) is becoming ever more important to accurately predict the performance of the considered part. In a highly competitive market, industries are demanding higher performance, improvements in fuel efficiency, increased recycling and greater safety, whether this is an airplane wing or mineral water ...
Application of LS-DYNA for Auto NVH Problems
Yun Huang, Zhe Cui (LSTC)
NVH (Noise, Vibration and Harshness) is an important topic for the design and research of automotives. Increasing demands for improved NVH performance in automotives have motivated the development of frequency domain vibration and acoustic solvers in LS-DYNA. This paper presents a brief introduction of the recently developed frequency domain vibration and acoustic solvers in LS-DYNA, and the application of these solvers in auto NVH problems. ...
Assessing Options for Improving Roadside Barrier Crashworthiness
D. Marzougui, C.D. Kan, K.S. Opiela (George Mason University)
The introduction of new crash test requirements raises questions about the efficacy of commonly used barriers that had been accepted under earlier test requirements. Seven commonly-used barriers were crash tested under the new MASH requirements in a recent NCHRP project. Three of the barriers tested did not meet the new requirements for the test with the 2270 kg vehicle. While the implementation of the MASH standards does not require hardware ...
ATV and MATV techniques for BEM acoustics in LS-DYNA
Yun Huang, Zhe Cui (LSTC)
This paper presents the new ATV (Acoustic Transfer Vector) and MATV (Modal Acoustic Transfer Vector) techniques for BEM acoustics in LS-DYNA, which were implemented recently. Acoustic Transfer Vector provides the transfer function between the normal nodal velocity on structural surface and the acoustic response at selected field points; Modal Acoustic Transfer Vector provides similar transfer function, but is based on the excitation from ...
AutoMesher for LS-DYNA Vehicle Modeling
Ryan Alberson, David Stevens (Protection Engineering Consultants)
James D. Walker, Tom Moore (Southwest Research Institute)
Software has been developed to automatically mesh CAD files in support of expedient modeling of armored vehicles and similar structures. The AutoMesher software is written in Python as well as LSTC’s Script Command Language (SCL). The SCL syntax is similar to C programming, but runs as a script within LSTC’s LS-PrePost® (LSPP) software application. A Python module is used as the interface and a wrapper for LSPP. By leveraging the functions in ...
Batted-Ball Performance of a Composite Softball Bat as a Function of Ball Type
Jennifer Yee (Combat, University of Massachusetts)
James A. Sherwood (University of Massachusetts)
Stephen Fitzgerald (Combat)
The ideal models of softball bats and balls should have the flexibility to allow for the ability to capture how BBS varies as a result of changes in bat and ball constructions. If such models were available, then the design engineer could customize the bat design with the goal to maximize the BBS for a given ball construction. A credible finite element model of the ball-bat collision for softball is challenging. Achieving such a model is ...
Benchmark of Frequency Domain Methods for Composite Materials with Damage using LS-DYNA®
Myeong-Gyu Bae, Seonwoo Lee (THEME Engineering, Inc.)
The composite material is widely used in the structures as aircrafts, satellites, ships, automobiles, and so on which demand light weight and high performance. A various type of damage could occur through low-speed impacts and fatigue loads. It is generally known that the assessment of the natural frequency by vibration testing is a very attractive method as a Non-Destructive Test (NDT) and the vibration response of a composite structure can be ...
Benchmark of LS-DYNA® for Off-shore Applications according to DNV Recommended Practice C208
Marcus Lilja (DYNAmore Nordic AB)
The use of non-linear FEA is growing in the offshore industry. Det Norske Veritas AS (DNV), one of the world’s largest ship and offshore classification societies to the maritime industry, has developed a Recommended Practice (DNV-RP-C208) on the usage of non-linear implicit finite element simulations in offshore applications. DNV-RP-C208 creates a de facto standard for structural load capacity analysis of off-shore structures. The Recommended ...
Breaking Bad(ly) – Investigation of the Durability of Wood Bats in Major League Baseball using LS-DYNA®
Eric L. Ruggerio, James A. Sherwood and Patrick J. Drane (University of Massachusetts)
The bats used in Major League Baseball (MLB) are turned from a single piece of wood. Northern white ash had been the wood of choice until the introduction of hard rock maple in the late 1990s. Since the introduction of maple, there has been a measurable increase in the number of bats breaking into multiple pieces. These failures can be a significant factor during play, i.e. pieces of bats landing flying into the field of play, thereby ...
CAE Applications for Balanced Curtain Airbag Design Meeting FMVSS226 and System/Component Performance
Bill Feng (Jaguar Land Rover)
Curtain airbag is a key restraint component to protect occupants in the events of side impact (referred as First Impact) and rollover (referred as Second Impact). In the curtain airbag design during the vehicle programme, following requirements dominate the design. FMVSS226 Ejection Mitigation (EjM) requires curtain airbag provide adequate protection for rollover event. Restraint system performance for legal and consumer tests, such as FMVSS214 ...
CAE Workflow Coupling Stamping and Impact Simulations
Henry Shibayama, Rohit Ramanna, Sri Rama Murty Arepalli, Arthur Camanho (ESI)
Visual-Environment is an open and integrated user environment enabling simulation and analysis across multiple domains for efficient product engineering. A CAE workflow has been developed chaining stamping and impact simulations. The workflow originates from stamping matrix design (performing stamping simulations) to impact simulations considering the residual stress and thickness variation due to stamping process. The objective to be ...
Calibration of Material Models for the Numerical Simulation of Aluminium Foams – MAT 154 for M-PORE Foams @ 3 Loads
Vito Primavera, Marco Perillo (EnginSoft SpA)
A. Carofalo, M. De Giorgi, R. Nobile (University of Salento)
Metallic foams are very promising for engineeristic applications due to their peculiar characteristics, like the high energy-absorbing property coupled with a reduced weight. Even if applications can be widespread in several fields, such as automotive, civil, aerospace, etc., industrial requirements are still far to be fully accomplished, especially in terms of technological processes and a whole mechanical characterization. Material modeling ...
Car Body Optimization Considering Crashworthiness, NVH and Static Responses
Phani Adduri, Gary Quinn, Juan P. Leiva, Brian C. Watson (Vanderplaats Research and Development, Inc)
This paper demonstrates a design system to efficiently perform optimization based on responses computed from multiple LS-DYNA® analyses while also taking into consideration the linear loading conditions such as the ones for NVH and Static responses. The proposed design system, ESLDYNA, is based on the Equivalent Static Load (ESL) method, which requires the iterative process of non-linear structural analysis (LS-DYNA) and linear structural ...
Comparative Study of Material Laws Available in LS-DYNA® to Improve the Modeling of Balsa Wood
Teddy MAILLOT, Vincent LAPOUJADE, Edith GRIPPON (DynaS+)
Bernard TOSON, Nathalie BARDON, Jean-Jacques PESQUE (CEA CESTA)
In order to compute the requirements for transporting packages in various situations using balsa wood as an energy absorber, a constitutive model is needed that takes into account all of the specific characteristics of the wood, such as its anisotropy, compressibility, softening, densification, and strain rate dependence. Completeness alone is not sufficient for the model, because it must perform appropriately in simulations that include many ...
Comparison of Particle Methods : SPH and MPS
Sunao Tokura (Tokura Simulation Research Corporation)
SPH (Smoothed Particle Hydrodynamics) implemented in LS-DYNA® has been used widely in various industrial fields as a reliable and robust particle method. At present SPH is considered as one of major numerical simulation method for compressible fluid and solid materials. Recently a unique particle method called MPS (Moving Particle Simulation) has been developed and started to use for some industrial application as a CFD (Computational Fluid ...
Comparison of the Brain Response to Blast Exposure Between a Human Head Model and a Blast Headform Model Using Finite Element Methods
Rahul Makwana (DEP-Autoline Inc)
Sumit Sharma (Eicher Trucks and Buses VE Commercial Vehicles Ltd.)
Liying Zhang (Wayne State University)
Impact induced traumatic brain injury (TBI) has been studied by physical testing using various surrogates, including cadavers, animals, and crash test dummies and by computer modeling including Finite Element (FE) models of human, animal and crash test dummy head. The blast induced TBI research and evaluation of a protective device call for a head model which can mimic wave propagation phenomena through different parts of the head. For proper ...
Coupled Simulation of the Fluid Flow and Conjugate Heat Transfer in Press Hardening Processes
Uli Göhner, Bruno Boll (DNYAmore GmbH)
Inaki Caldichouri (LSTC)
Tim Wicke (Volkswagen AG)
Due to the increasing demands on lightweight design, stiffness and crash performance of automotive body components, the press hardening method becomes widely-used. The high strength of press hardened parts of up to 1.5 GPa results from the nearly complete conversion of austenite into martensite. This microstructural transformation, also known as 'hardening', happens during or subsequently to the forming process. In order to achieve a cooling ...
Coupling of the EM Solver with Mechanical and Thermal Shell Elements
Pierre L’Eplattenier, Julie Anton, Iñaki Çaldichoury (LSTC)
The Electromagnetics (EM) solver of LS-DYNA® has recently been extended to shell elements, in order to solve coupled EM/mechanical/thermal problems on thin plates, which appear in Magnetic Metal Forming and Welding experiments. Due to the magnetic diffusion of the EM fields through the thickness of the plate, which is a very important phenomenon that needs to be precisely solved, the EM part of the simulation still needs a solid mesh with ...
Crash and Impact Simulation of Composite Structures by Using CAE Process Chain
Ulrich Stelzmann, Madhukar Chatiri (CADFEM GmbH)
Thorsten Schütz (Adam Opel AG)
Anton Matzenmiller (Univ. of Kassel)
The objective of this paper is to present a workflow for numerical modeling and simulation of carbon fiber reinforced plastic (CFRP) composite structures including CAE process integration. A computational constitutive model for anisotropic damage is developed to characterize the elastic-brittle behavior of fiber-reinforced laminated composites. The composite damage model is implemented within LS-DYNA® as user defined material subroutine. A CAE ...
Crash Simulation of KTM “X-BOW” Car Front Impact Structure
Katharina Fischer (KTM Technologies GmbH)
Phelippe Pereira (ESSS)
Madhukar Chatiri, Matthias Hörmann, Andre Stühmeyer (CADFEM GmbH)
The goal of this presentation is to study the structural behavior of the KTM “X-BOW” crash box front impact structure in a 0° impact test against a rigid wall. The energy absorbing crash box is made of laminated composite sandwich material. A “shell-solid-shell” numerical approach is used to model the sandwich composite structure. Shell elements are used for the face layers whereas solid elements are used for aluminum honeycomb core. Shell ...
Crash Test & Simulation Comparisons of a Pickup Truck & a Small Car Oblique Impacts Into a Concrete Barrier
D. Marzougui, C.D. Kan, and K.S. Opiela (George Mason University)
Detailed finite element (FE) models of a 2270 kg Chevrolet Silverado and a 1100 kg Toyota Yaris are used as surrogates for barrier crashworthiness under the new Manual for Assessment of Safety Hardware (MASH). MASH requires assessment of barriers for both large and small vehicles, hence the use of 2270P and 1100P test vehicles. Impacts of these two vehicles into a New Jersey-shaped concrete median barrier were simulated and compared to ...
Current Status of Subcycling and Multiscale Simulations in LS-DYNA®
Thomas Borrvall (DYNAmore Nordic AB)
Dilip Bhalsod, John O. Hallquist, Brian Wainscott (LSTC)
Subcycling in explicit finite element simulations refers to the technique where a model is partitioned in levels of the characteristic time step of its constituting finite elements. Each sub model is then integrated independently of the others using a time step that pertains to that specific sub model, with the exception of special treatment at the interface between sub models. With the subcycling option in LS-DYNA, up to seven sub models are ...
Designing a Radioactive Material Storage Cask Against Airplane Crashes With LS-DYNA®
Gilles Marchaud, Louis Vilela, Stéphane Nallet (AREVA TN)
For 50 years, AREVA TN has been supplying customer-focused, innovative transportation and storage solutions for radioactive material with the highest levels of safety and security. Transportation and storage casks are designed to comply with stringent regulations. For instance, the TN NOVA™ system, designed to store used fuel assemblies, is required to withstand the impact of a 20-ton aircraft at a velocity of 215m/s, despite the extremely ...
Determining the Material Constants for Mullins Effect in Rubber Part One: Uniaxial
William W. Feng, John O. Hallquist (LSTC)
In this paper, the strain-energy density with Mullins damage function on unloading and subsequent reloading is considered. We introduce a damage function that has four material constants: two for unloading and two for subsequent reloading. The effect of these constants on unloading and subsequent reloading is studied for uniaxial extension. We determine these four material constants from a set of numerically generated uniaxial extension test ...
Development & Validation of a Finite Element Model for a Mid-Sized Passenger Sedan
D. Marzougui, D. Brown, H.K. Park, C.D. Kan, and K.S. Opiela (George Mason University)
A Finite Element (FE) model of a mid-size passenger sedan was created by reverse engineering to represent that aspect of the fleet in crash simulation analyses. A detailed FE model of this vehicle was created to allow application for different types of crash scenarios. The initial version of the model includes detailed and functional representation of suspension and steering components. Material characteristics and thicknesses of the different ...
Development of Dynamic Punch test with DIC for Verification of Simulations with MAT224
Amos Gilat, Jeremy D. Seidt, Jeremiah T. Hammer, and Timothy J. Liutkus (Ohio State University, USA)
Calibration and verification of simulations with LS-DYNA® in which plasticity and failure models, like MAT224, are used require data from well controlled experiments. One example is the simulation of containment during blade-off and disk failure in jet engines. This application requires accurate simulation of the penetration of a projectile at many combinations of impact speeds, projectile-target geometries, and temperatures. To validate the ...
Development of Pedestrian Protection for the Qoros 3 Sedan
Niclas Brannberg, Pere Fonts, Chenhui Huang, Andy Piper, Roger Malkusson (Qoros Automotive Co., Ltd)
Pedestrian protection has become an important part of the Euro NCAP consumer test and to achieve a 5-star rating for crash safety, a good rating for the different pedestrian load cases is imperative. It was decided at the very start of the Qoros 3 Sedan’s development program that this should be made a priority. A skilled team of safety engineers defined the layout of the vehicle to support this target, and an extensive simulation program using ...
Development of Researched Moving Deformable Barrier (RMDB) FE model for Oblique Crash Test
Nobuhisa Ishiyama, Shinobu Tanaka, Satoshi Fukushima, Tsuyoshi Yasuki (Toyota Motor Corporation)
Masahiro Saito (Toyota Technical Development Corporation)
Jesse Buehler, Brian Tew (Toyota Motor Engineering & Manufacturing North America)
This paper describes a finite element model for a Researched Moving Deformable Barrier (RMDB) that simulates an oblique crash test. National Highway Traffic Safety (NHTSA) is currently conducting research on oblique RMDB-to-Vehicle (Oblique) testing. The RMDB, which consists of an aluminum honeycomb and an outer cladding sheet, exhibited two deformation features after the oblique crash test. The first was cracks observed on the outer cladding ...
Evaluation of ATD Models for Simulating Occupant Responses under Vertical Impact
Ming Cheng, Doug Bueley, Lock-Sui Chin, Jean-Philippe Dionne, Neil Wright, Aris Makris (Med-Eng Holdings, LLC)
In addition to traditional threats to vehicle occupants from frontal crash and side impact, passengers of military vehicles can also be subjected to vertical shock loading on their thoraco-lumbar spine and legs arising from the detonation of roadside bombs or landmines. In such explosion events, the vehicle hull is subjected to high level transient momentum loading, resulting in an acceleration impulse that transfers to the occupant through the ...
Evaluation of LS-DYNA® Corpuscular Particle Method for Side Impact Airbag Deployment Applications
Chin-Hsu Lin, Yi-Pen Cheng (General Motors)
Jason Wang (LSTC)
A uniform pressure method, i.e. no pressure variation on bag surface and location, in LS-DYNA has been commonly used to simulate airbag deployment and interaction of airbag with the occupants. Another newly developed LS-DYNA CPM (Corpuscular Particle Methodology) has gained recognition and acceptance recently because it considers the effect of transient gas dynamics and thermodynamics by using a particle to represent a set of air or gas ...
Fracture Prediction and Correlation of AlSi Hot Stamped Steels with Different Models in LS-DYNA®
G. Huang, H. Zhu, S. Sriram (ArcelorMittal Global R&D E. Chicago Center)
Y. Chen, Z. C. Xia, O. Faruque (Ford Motor Company)
Reliable predictions of the fracture behavior in a crash event have become ever important in recent years as they will enable the reduction of physical prototype testing and the acceleration of vehicle development time while maintaining high safety standards. The increasing use of even stronger grades of Advanced High-Strength Steels (AHSS) such as hot-stamped boron steels provides particular challenges to fracture modeling due to their ...
Further Advances in Simulating the Processing of Composite Materials by Electromagnetic Induction
M. Duhovic, M. Hümbert, P. Mitschang, M. Maier (Institut für Verbundwerkstoffe GmbH)
P. L’Eplattenier , I. Çaldichoury (LSTC)
Continuous induction welding is an advanced material processing method with a very high potential of providing a flexible, fast and energy efficient means of joining together thermoplastic composites to themselves and metal alloys. However, optimization of the process is very difficult as it involves the interaction of up to four different types of physics. In the previous installments of this work, static plate heating and continuous induction ...