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11th International LS-DYNA Conference

A Brief Look at *MAT_NONLOCAL: A Possible Cure for Erosion Illness?
Leonard Schwer - Schwer Engineering & Consulting Services
The computational mechanics literature dealing with damage and failure is filled with work addressing what is termed mesh regularization techniques. These various techniques seek to eliminate, or minimize, the numerical artifact of strain localization. LS-DYNA® provides a technique for attempting to regularize meshes with damage and failure via the keyword *MAT_NONLOCAL. The non-local implementation in LS-DYNA is based on the work ...
A Comparison of recent Damage and Failure Models for Steel Materials in Crashworthiness Application in LS-DYNA
Dr. André Haufe (Dynamore GmbH)
Frieder Neukamm, Dr. Markus Feucht (Daimler AG)
Paul DuBois (Consultant)
Dr. Thomas Borvall (ERAB)
With increasing requirements on crashworthiness, and light-weight car body structures being a central issue in the future of automotive development, the use of high strength steel grades has become wide-spread in modern vehicles. Since these materials all too often show significantly lower ductility than conventional steels, it is of great importance to precisely predict their failure in crash loading conditions. Hence constitutive models ...
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 ...
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 ...
A New Method for the Structural Optimization of Product Families
Larsgunnar Nilsson - Engineering Research Nordic AB
Michael Öman - Scania CV AB
This paper discusses the problem of structural optimization of product families subjected to multiple load cases, evaluated by computationally costly finite element analysis. Product families generally have a complex composition of shared components that makes individual product optimization difficult as the relation between the shared variables is not always intuitive. More optimal is to treat the problem as a product family optimization ...
A New Strain Rate Dependent Spot Weld Model for Automotive Crash Applications
Dr. P.K.C. Wood - University of Warwick
Mr. M.A. Buckley - Jaguar and Land Rover
Dr. B. Walker - Ove Arup and Partners
Mr. T. Dutton - Dutton Simulation
New spot weld failure models in a range of sheet steels have been developed for use in the virtual testing of automotive crash structures to ensure compliance to international safety requirements. The desire to balance the cost to develop the data input to spot weld failure models and their capability to predict failure in simulation tools is central to the method. Full vehicle crash simulations suggest confidence in the predictive capability ...
A Simple, Efficient and Robust Way to do Binder Wrap Simulation with LS-DYNA Implicit Solver
Kaiping Li, Yang Hu - ASME, Chrysler Group LLC
Xinhai Zhu - Livermore Software Technology Corp.
With the newly improved LS-DYNA implicit solver, the possibility to use it for binder wrap simulations of Stamping Process becomes reality. The importance of binder wrap simulation can never be overly emphasized since it will not only approve or disapprove the concepts of binder shape design, hence the whole addendum development of stamping process, but also impact the final results of stamping process simulations.
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 ...
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.
Advanced Mode Analysis for Crash Simulation Results
Clemens-August Thole
Potential scatter of simulation results caused for exampleby buckling, is still a challenging issue for the predictability. Principle component analysis (PCA) is a well-known mathematical method for data analysis. In order to characterize scatter PCA analysis was applied to the simulation results from a number of runs using all node positions at all time steps. For industrials relevant problems the size of the data base is larger than 100 ...
Advancements in Material Modeling and Implicit Method for Metal Stamping Applications
Xinhai Zhu, Li Zhang - Livermore Software Technology Corporation
A review of recent developments in stamping manufacturing will be conducted. The review will be focused on discussions surrounding new features related to static implicit binder wrap, advanced material modeling with Yoshida’s non-linear kinematic hardening in conjunction with Hill’s 1948, Barlat 1989 and Barlat 2000 yield criteria.
Advances on the Incompressible CFD Solver in LS-DYNA
Facundo Del Pin - Livermore Software Technology Corporation
The present work will introduce some of the resent developments in the Incompressible CFD (ICFD) solver currently under development in LS-DYNA. The main feature of this solver is its ability to couple with any solid model to perform Fluid-Structure interaction (FSI) analysis. Highly non-linear behavior is supported by using automatic re-meshing strategies to maintain element quality within acceptable limits. In this work we will ...
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. ...
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 ...
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 ...
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 ...
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 ...
An MPP Version of the Electromagnetism Module in LS-DYNA for 3D Coupled Mechanical-Thermal-Electromagnetic Simulations
P. L'Eplattenier, C. Ashcraft - Livermore Software Technology Corporation
I. Ulacia - Mondragon Goi Eskola Politeknikoa
A new electromagnetism module is being developed in LS-DYNA for coupled mechanical/thermal/electromagnetic simulations. One of the main applications of this module is Electromagnetic Metal Forming (EMF). The electromagnetic fields are solved using a Finite Element Method (FEM) for the conductors coupled with a Boundary Element Method (BEM) for the surrounding air/insulators. Both methods use elements based on discrete differential forms for ...
An Overview of LS-OPT Version 4.1
Nielen Stander, Tushar Goel - Livermore Software Technology Corporation
The main focus of the LS-OPT V4.1 development has been to further expand the graphical postprocessor and to significantly improve reliability, usability and transparency when distributing solver jobs across networks. Much of the latter has been accomplished through industrial collaboration. While LS-OPT originated as an LS-DYNA® based tool, new features are increasingly being developed to facilitate interfacing with non-LS-DYNA solvers. ...
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 ...
Application of Topology Optimization for Crash with LS-OPT/Topology
Heiner Müllerschön, Katharina Witowski - DYNAmore GmbH
Nikolay Lazarov - University of Karlsruhe
Since end of 2009 a new software tool LS-OPT/Topology is available from LSTC. With LS-OPT/Topology nonlinear topology optimization with LS-DYNA can be applied for static and even for dynamic problems. The underlying method is Hybrid Cellular Automata (HCA) which is a heuristic, gradient-free approach. The objective is to obtain a structure with uniform internal energy density subject to a given mass fraction. In the current version ...
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) ...
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 ...
Capabilities of Result Visualization in LS-OPT V4.1 - Demonstrated by Means of Industrial Problems
Katharina Witowski, Heiner Müllerschön - DYNAmore GmbH
During the last decade the optimization software LS-OPT has been used for design optimization, for DOE-studies, for system identification and for stochastic investigations in many industrial projects. LS-OPT became over the years a highly sophisticated software tool with very effective and reliable optimization methodologies particular suitable for highly nonlinear problems. This paper illustrates the capabilities of LS-OPT by means of ...
Comparison of FEM and SPH for Modeling a Crushable Foam Aircraft Arrestor Bed
Matthew Barsotti - Protection Engineering Consultants, LLC
Passenger aircraft can overrun the available runway area during takeoff and landing, creating accidents involving aircraft damage and loss of life. Crushable foam arrestor bed systems are often placed at runway ends to mitigate such overruns. As the aircraft tires roll through the bed, the material compaction dissipates energy, bringing the aircraft to a controlled stop. A detailed two-year analysis was conducted for the TRB Airport ...
Comparison of Lagrangian, SPH and MM-ALE Approaches for Modeling Large Deformations in Soil
Cezary Bojanowski - Argonne National Laboratory
Ronald F. Kulak - RFK Engineering Mechanics Consultants
Ongoing research at the USDOT funded Transportation Research and Analysis Computing Center (TRACC) at Argonne National Laboratory on bridge stability for bridges with piers in scour holes relies greatly on LS- DYNA® capabilities for modeling large deformations in soil and fluid structure interaction. When it comes to soil modeling, material model MAT_005 Soil and Crushable Foam is often used as a first approximation. It is especially useful ...
Crashworthiness Analysis of Finite Element Truck Chassis Model Using LS-DYNA
Yucheng Liu - University of Louisiana
This paper presents a detailed multi-purpose finite element model of a light duty truck chassis and evaluates this model in computational simulations of full frontal, offset frontal, and corner impacts. The simulation results are analyzed which correctly describe the characteristics and performance of a truck chassis during under impact scenarios. Through the validation and computational simulations, the presented model is proved to ...
Crashworthiness of Composite Structures with Various Fiber Architectures
Nageswara R. Janapala, Fu-Kuo Chang - Stanford University
Robert K. Goldberg, Gary D. Roberts, Karen E. Jackson - NASA Glenn Research Center
Advanced textile composite structures, such as braids and fabrics, are showing promising characteristics for energy absorption. However, modeling of these composite structures is quite challenging because of their complicated architecture, varied fiber/matrix combinations, and the failure mechanisms associated with them. Unfortunately, none of the existing material models is capable of simulating diverse failure behaviors observed during ...
Development of Hail Material Model for High Speed Impacts on Aircraft Engine
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 ...
Development of Parachute Simulation Techniques in LS-DYNA
Benjamin Tutt, Scott Roland - Airborne Systems
Richard Charles, Greg Noetscher - Natick Soldier Center
Parachute design often relies heavily on historical experimental data, and parachute development frequently requires numerous test campaigns. Although both of these techniques eventually result in successful parachute systems, such an approach will rarely result in any true advance to parachute engineering knowledge. Consequently, an unusually high emphasis is placed on experienced parachute design personnel, and often similar lessons have ...
Development, implementation and Validation of 3-D Failure Model for Aluminium 2024 for High Speed Impact Applications
Paul Du Bois, Murat Buyuk, Jeanne He, Steve Kan - NCAC-GWU
FAA William J Hughes Technical Center (NJ) conducts a research project to simulate failure in aeroengines and fuselages, main purpose is blade-out containment studies material testing performed by OSU ballistic testing performed by NASA/GRC numerical simulations performed by GWU-NCAC involved the implementation in LS-DYNA of a tabulated generalisation of the Johnson-Cook material law with regularisation to accommodate simulation of ...
Developments in Line-Die Simulation and Exterior Surface Quality Check
Klaus Wiegand - Daimler AG
Li Zhang, Xinhai Zhu - Livermore Software Technology Corporation
A review of recent developments in stamping manufacturing will be conducted. The review will be focused in area surrounding the new line die simulation capabilities and in exterior surface panel quality check.
Drop Test into Water and Wave Impact Simulations of a Novel 7-Meter Plastic Boat with LS-DYNA
Martin Vézina, Arash Firoozrai - SimuTech Group Inc.
The US Congress, in its desire for a safer boat for the US Navy, contracted Stanley Widmer Associates Inc. to design and build a novel rotationally molded 7-meter boat using a patented "kiss-off" design. A first ever made prototype will be ready for trial in 2010. The material used for most of the boat, high density cross linked polyethylene, and the double hull with “kiss-off” design should, among other advantages, increase the boat's ...
EMAS Core Material Modeling with LS-DYNA
Yijian (Jack) Shi - Engineered Arresting Systems Corporation
With Lagrangian meshes and the LS-DYNA FEA explicit solver, Mat #63 – Crushable Foam is used to simulate the Phenolic foam – a candidate material for an EMAS core [7]. The simulated conditions include three scenarios: unconfined uniaxial compression, confined uniaxial compression and plate penetration into a large block. The three scenarios are purposely chosen for utilizing test data and validating simulation results. The simulations reveal ...
Engine Impeller Sub-Fragmentation Simulation Using EFG Method
Shoufeng Hu - Hamilton Sundstrand
C. T. Wu, Yong Guo - Livermore Software Technology Corporation
Engine impeller burst containment test may lead to the impeller sub-fragmentation. The containment of the impeller debris from sub-fragmentation presents a new challenge, because of the unpredictable pattern of dynamic fracture. In this study, the capability of EFG failure method in predicting the dynamic fracture of the ductile material, used for the engine impeller under impact loading, is demonstrated. In the EFG method, the combination of ...
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 ...
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 ...
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 ...
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 ...
Heat Transfer Simulation to Determine the Impact of Al-5Mg Arc Sprayed Coating onto 7075 T6 Al Alloy Fatigue Performance
G. D'Amours, B. Arsenault, F. Breton - National Research Council Canad
D. Dubé - Université Laval
Aluminum-5% magnesium coatings was deposited by arc spraying onto aircraft Al 7075 T651 structural alloy for corrosion protection while required to maintain the substrate material fatigue performance integrity. Fatigue performance of coating system is complex and in order to better understand the variability of the fatigue performance of coatings, heat flow in substrate was studied and simulated to determine the temperature evolution during ...
High Fidelity In-Bore Pressure Modeling
Michael M. Chen - U.S. Army Research Laboratory
Significant research efforts have been conducted to gain an in-depth understanding of projectile-weapon interactions at the U.S. Army Research Laboratory. The objective of this paper is to increase the fidelity of in-bore modeling and simulations that will facilitate the development of component and system models for U.S. Army weapon systems. Specifically, the in-bore pressure as a projectile travels through a gun tube, which has been ...
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, ...
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 ...
Improvement of Energy Absorption for the Side Member Using Topography Optimization
Iku Kosaka - Vanderplaats R&D Inc.
This paper describes a design system to optimize the non-linear responses computed from LS-DYNA® using various optimization techniques, especially with large-scale (large number of design variables) optimization, and demonstrates the system as it improves the energy absorption for the side member of the vehicle. The proposed design system uses the equivalent static load (ESL) method, which requires the iterative process of ...
Improvement of the Energy Absorption Capacity of an Intercity Coach for Frontal Crash Accidents
Muhammed E. Cerit, Mehmet A. Guler, Uğur Yolum - TOBB University of Economics and Technology Ankara
According to the accident statistics for buses and coaches, accidents involving frontal crash constitute an important percentage among all bus accidents. In this type of accidents, front body of the bus structure gets severely damaged and this puts the driver and crew in great injury risk. And most of the frontal crash accidents result in death of the bus driver. Because of this, the safety of both the bus driver and the crew should be ...
Investigation of *MAT_58 for Modeling Braided Composites
Brina J. Blinzler, Wieslaw K. Binienda - University of Akron, Akron Ohio
Robert K. Goldberg - NASA Glenn Research Center, Cleveland Ohio
An in-depth analysis is needed to simulate the impact behavior of triaxially braided composite materials. Before an impact simulation can be generated, all material input parameters must be found. The objective of this work is to use static tests conducted on axial and transverse coupons to determine these input parameters. In particular, analysis methods that capture the architecturally dependent damage observed in these tests in ...
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 ...
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 ...
Investigations of Generalized Joint Stiffness Model in LSTC Hybrid III Rigid-FE Dummies
Shu Yang, Xuefeng Wang - IMMI
The joint restraint model *CONSTRAINED_JOINT_STIFFNESS_GENERALIZED in LS-DYNA® provides users a way to define stiffness characteristics for joints defined by *CONSTRAINED_JOINT_OPTION. Based on the relative angles between two coordinate systems, moments are generated according to user-defined curves. It has been defined in LSTC Rigid-FE dummy models to describe the joint behaviors at limb joints such as hip, elbow and knee joints. There are ...
Isogeometric Analysis in LS-DYNA
David J. Benson - UCSD
Isogeometric analysis: finite element analysis performed using the same basis functions as in computer aided design (CAD). CAD basis functions Implementing elements for specific basis functions Desire an ability to rapidly prototype new elements