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10th International LS-DYNA Conference

Drop Analysis of Waste Transfer Flask
Suresh Babu, Jayanta Biswas - Atomic Energy of Canada Limited
The present paper describes the drop analyses performed on a waste transfer flask using LS-DYNA® finite element software. Radioactive waste generated during retubing of CANDU®6 reactors are placed in waste containers. Waste transfer flasks are used to transfer waste containers from the reactor building to storage structures. The waste transfer flask is a complex mechanical assembly made of double wall steel shells filled with lead. At the ...
On Closing the Constitutive Gap Between Forming and Crash Simulation
F. Neukamm, M. Feucht, K. Roll - Daimler AG, Germany
A. Haufe - DYNAmore GmbH, Germany
With increasing requirements on crashworthiness, and light-weight car body structures being a central issue in future automotive development, the use of high strength steel qualities has become wide-spread in modern cars. Since these materials often show significantly lower ductility than conventional steels, it is of great importance to precisely predict failure under crash loading conditions. Hence constitutive models in crashworthiness ...
Structural Analysis with Vibro-Acoustic Loads in LS-DYNA
Mostafa Rassaian, JungChuan Lee, Thomas T. Arakawa - Boeing Phantom Works Structures Technology
Yun Huang, Livermore Software Technology Corporation
Many structures are designed to operate in hot temperature and stringent aero-acoustic fatigue environment, e.g. the engine inlet and the heat shield of aircraft are subject to high temperature and sonic pressure level. It is important to evaluate the dynamic response of the structures exposed to both vibration and acoustic sources of excitations. A new feature of structural analysis with vibro-acoustic loads has been implemented in ...
Numerical and Experimental Determination of Strains in the Vicinity of a Centrally Located Circular Discontinuity in AA6061-T6 Square Extrusions during Axial Crushing
Neil Turton, Amitabha Majumder, William Altenhof, Daniel Green, Vivek Vijayan, Honggang An,Shun Yi Jin - University of Windsor, Canada
An experimental and numerical investigation was conducted on AA6061-T6 extrusions with centrally located through-hole discontinuities to investigate the strains in the vicinity of the crush trigger. The extrusions used in this research were of square cross sectional geometry with a nominal side width of 38.1 mm, wall thickness of 3.15 mm and length of 200 mm. Centrally located circular discontinuities with a diameter of 14.29 mm ...
Structural Dynamic Response of a Track Chain Complete Undercarriage System using Virtual Proving Ground Approach
Marco Perillo, Vito Primavera - EnginSoft SpA
Giorgio Bonello, Marco Cavedoni - Italtractor ITM Spa
ITM Group Engineering Department uses advanced tools as finite element method for static structural analyses of undercarriages, side frames or undercarriage components, as track chain, rollers and tension devices. In order to integrate the recent prototype concepts into this design process combining full system real time dynamic simulations able to represent a typical situation due to operation manoeuvre, experimental test information and 30 ...
Forging and Extrusion Analysis with LS-DYNA® using 3D Adaptive EFG Method
Hongsheng Lu, C. T. Wu, Jingxiao Xu - Livermore Software Technology Corporation
With the recent improvements in adaptive procedure, adaptive mesh-free method has become an important tool to solve the 3D forging and extrusion problems that usually involve large topology change with severe local deformation. In this paper, the implicit version of 3D adaptive EFG method with emphases on the state variable transfer between successive discretizations is presented, and several problems are used to illustrate the ...
Influence of Selection Criterion on the RBF Topology Selection for Crashworthiness Optimization
Tushar Goel, Nielen Stander - Livermore Software Technology Corporation
Meta-models are frequently used to offset high computational cost of crashworthiness optimization problems. Radial basis function based meta-models are gaining popularity among various meta-modeling techniques due to their ability to approximate non-linear responses with relatively low fitting cost. However, the performance of RBF networks is very sensitive to the choice of topology. In this paper, the influence of three selection criteria ...
A Finite Element Analysis of Mid-Shaft Femoral Tolerance under Combined Axial-Bending Loading
Costin Untaroiu, Dan Genovese, Johan Ivarsson, Jeff Crandall - University of Virginia
Bone fractures occur frequently at mid-shaft femoral site during frontal and offset automotive crashes. Because these injuries are expensive, it is crucial to understand the injury mechanisms if this injury is to be prevented. The experimental investigation of femoral shaft tolerance under loading corresponding to real world accidents requires a challenging test setup that allows applying external loads in controlled conditions, mimics the ...
Assessment of Automotive Panel to Meet Handling Load Requirements: CAE Simulation
Harihar Kulkarni, John M. Eidt - Ford Motor Company
Dharmveer Podhuturi, Akbar Farahani - Engineering Technology Associates, Inc.
Material handling of sheet-metal components within the plant or one plant to the other significantly impacts quality and assembly process. Any permanent deformation of sheet metal component contributes to poor quality of an automotive subassembly. One way is to minimize occurrence of unacceptable deformation is to follow trial and error approach. However, such approach is time consuming during launch; in addition cost of stamping and ...
Modeling and Simulation of Bogie Impacts on Concrete Bridge Rails using LS-DYNA
Akram Abu-Odeh - Texas Transportation Institute
Bridge rails are constructed to contain and redirect an errant vehicle. They are constructed to withstand the impact severity of such vehicular impact based on the desired containment level. To evaluate the structural integrity of a given bridge rail design, bogie tests were conducted using a 5000 lb bogie as an impactor. In this paper, LS-DYNA was used to model the concrete barrier to simulate the bogie impact. Three material models in ...
Effect of Material Characteristics on Wrinkling During Dome Forming of a Beverage Can using LS-DYNA
R.E. Dick, J.W. Yoon -Alcoa Technical Center, USA
Wrinkling of thin sheet metal products such as beverage cans continues to be experienced by can manufacturers and is observed with some aluminum material suppliers more than others. These wrinkles are caused by compressive instabilities during forming, and with small base diameter cans and light gauge material, the likelihood of this wrinkle formation increases. Manufacturing experience suggests that dome wrinkling is influenced by many ...
Coupling FE Software through Adapter Elements: A Novel Use of User-Defined Elements
Yuli Huang, Andreas Schellenberg, Stephen A. Mahin, Gregory L. Fenves - University of California at Berkeley
An adapter element provides a versatile and computationally efficient method for coupling several finite element (FE) analysis programs so that the unique modeling and analysis capabilities of each can be utilized simultaneously in the simulation of a complete system. FE software is coupled by (1) using each software's programming interface to embed an adaptor element, and (2) connecting the adapter elements using OpenFresco (Open-source ...
Ramp Wave Compression in a Copper Strip Line: Comparison Between MHD Numerical Simulations (LS-DYNA®) and Experimental Results (GEPI device)
Gaël Le Blanc,Patrice LaPorte,Gilles Avrillaud, Paul Vincent - ITHPP, France
Pierre-Yves Chanal, Pierre-Louis Hereil - Centre d’Etudes de Gramat, France
Pierre L’eplattenier - LSTC, USA
GEPI [3][4] is a pulsed power generator developed by ITHPP for Centre d’Etudes de Gramat (CEG) devoted to ramp wave (quasi isentropic) compression experiments in the 1 GPa to 100 GPa range and to non shocked high velocity flyer plate in the 0.1 km/s to 10 km/s range. The aim of this paper is to compare numerical simulation and experimental results on a 3D GEPI configuration. A coupled mechanical / thermal / electromagnetism ...
A Study of Quasi-static Problem by SPH Method
Tatsuo Sakakibara, Toru Tsuda, Ryo Ohtagaki - ITOCHU Techno-Solutions Corporation
The SPH method is well known for the hydrodynamics and recently SPH is applied for the impact and the penetration behavior into solid materials. SPH is completely mesh free so that it seems to be appropriate to simulate crash behaviors of concrete and rock materials. However, the applicability and the effects of the parameter of SPH for quasi-static problems are not clear completely. In this paper, in order to verify the applicability and ...
Assessing the Convergence Properties of NSGA-II for Direct Crashworthiness Optimization
Guangye Li - IBM Deep Computing Group, Houston TX
Tushar Goel, Nielen Stander - Livermore Software Technology Corporation
The elitist non-dominated sorting genetic algorithm (NSGA-II) converges to the Pareto optimal front (POF) if a sufficient number of function evaluations are allowed. However, for expensive problems involving crash simulations, only a limited number of simulations might be affordable. It is observed that initially there are significant advances towards the POF but as the population matures, the improvements are relatively small. This means ...
Numerical Simulation and Experimental Study for Magnetic Pulse Welding Process on AA6061-T6 and Cu101 Sheet
Yuan Zhang, Geoff Taber, Anupam Vivek, Glenn Daehn, Pierre L’Eplattenier - Livermore Software Technology Corporation
Suresh Babu - The Ohio State University
Magnetic Pulse Welding (MPW) is a collision welding process, similar to Explosive/impact Welding (EXW), but it utilizes electromagnetic force as the acceleration mechanism. Therefore, the available energy is much lower than EXW and it makes the process safer and more reproducible for sheet seam welding. However, the available energy must be better focused and controlled. In the sheet seam MPW process, a flyer sheet is driven and collides with ...
Metamodel Sensitivity to Sampling Strategies: A Crashworthiness Design Study
Nielen Stander, Tushar Goel - Livermore Software Technology Corporation
A study is conducted to determine the sensitivity of 2 topologically distinct metamodel types to variations in the experimental design brought about by sequential adaptive sampling strategies. The study focuses on examples encountered in crashworthiness design. Three sampling strategies are considered for updating the experimental designs, namely (i) a single stage approach, (ii) a sequential approach and (iii) a sequential approach, but ...
Influence of the Coupling Strategy in the Numerical Simulation of Electromagnetic Sheet Metal Forming
Ibai Ulacia, Iñaki Hurtado - University of Mondragon
José Imbert, Michael J. Worswic - University of Waterloo, Canada
Pierre L’Eplattenier - Livermore Software Technology Corporation, USA
In this paper the Electromagnetic Forming process is numerically analyzed using a novel method that is being implemented into the commercial LS-DYNA® code. The method consists on a combination of a Boundary Element Method (BEM) and a Finite Element Method (FEM) formulations to compute the electromagnetic analysis. The main advantage of using BEM is that the air is not meshed avoiding the related problems and making it easier to couple the ...
Validation of Finite Element Crash Test Dummy Models for the Prediction of Orion Crew Member Injuries during a Simulated Vehicle Landing
Ala (Al) Tabiei - Mason, Ohio
Charles Lawrence - NASA Glenn Research Center, Cleveland, OH
Edwin L. Fasanella - NASA Langley Research Center, Hampton, VA
A series of dummy response during a simulated Crew Exploration Vehicle (CEV) module landing is conducted at the Wright-Patterson Air Force Base (WPAFB). These tests consisted of several crew configurations with, and without astronaut suits. Finite element models of the tests are developed and presented herein. The finite element models are validated using the experimental data. Several outputs from the dummy are collected and presented here ...
FE-Application in Aircraft Structure Analysis
Dr.-Ing. Matthias Hörmann - CADFEM GmbH, Germany
 
Soft Soil Impact Testing and Simulation of Aerospace Structures
Edwin L. Fasanella, Karen E. Jackson, Sotiris Kellas - NASA Langley Research Center, VA
In June 2007, a 38-ft/s vertical drop test of a 5-ft-diameter, 5-ft-long composite fuselage section that was retrofitted with a novel composite honeycomb Deployable Energy Absorber (DEA) was conducted onto unpacked sand. This test was one of a series of tests to evaluate the multi-terrain capabilities of the DEA and to generate test data for model validation. During the test, the DEA crushed approximately 6-in. and left craters in the sand of ...
A Numerical Investigation for Rock Fall Impact Behavior of Pithead of Tunnel with Falling Weight Impact Loading
Abdul Qadir Bhatti, Khaliq U Rehman Shad - National University of Sciences & Technology NUST, Pakistan
Norimitsu Kishi - Muroran Institute of Technology, Muroran
In order to establish a rational impact resistant design procedure for Arch type rock-shelter based on not only allowable stress design but also on ultimate state design and/or performance based design method, impact resistant capacity and/or maximum input impact energy for the RC structures must be clearly estimated. At present, the RC structures have been designed statically based on allowable stress design method. Here, maximum input ...
18 Wheel Truck Dynamic and Durability Analysis using Virtual Proving Ground
Ramesh Edara, Shan Shih - ArvinMeritor Inc.
Nasser Tamini, Tim Palmer, Arthur Tang - Engineering Technology Associates
Virtual proving ground (VPG) simulations have been popular with passenger vehicles. VPG uses LS-DYNA® based non-linear contact Finite Element analysis (FEA) to estimate fully analytical road loads and to predict structural components durability with PG road surfaces and tire represented as Finite elements. Heavy vehicle industry has not used these tools extensively in the past due to the complexity of heavy vehicle systems and especially due ...
Visualization of Pareto Optimal Fronts for Multiple Objectives with D-SPEX
Katharina Witowski, Marko Thiele - DYNAmore GmbH
Tushar Goel - Livermore Software Technology Corporation
Most engineering optimization problems require multi-objective optimizations that have no unique optimum because the objectives often conflict. LS-OPT 3.3 offers the capability to simultaneously compute many Pareto optimal solutions using a multi-objective genetic algorithm. The optimization post processing tool D-SPEX provides advanced features to visualize these Pareto optimal solutions and to approximate the Pareto optimal front using ...
Influence of the Residual Welding Phenomena on the Dynamic Properties of a Two-Meter Long Tube with 64 Non-Symmetrical Brackets Welded on a Helical Path
S.V. Medvedev, M.V. Petrushina, O.P. Tchij - United Institute of Informatics Problems NAS of Belarus
Welded elements of a two meter long tube is considered. The welded structure rotates with 100rad/sec. The non- symmetrical brackets are connected to the tube through by the welds of a curved trajectory that consists of circumferential parts and arbitrary curved part on a shaft surface and disposed on the tube in a helical sequence. The objective of the study was to explore the axis and hoop stress distribution on the shaft tube and its ...
Multi-Disciplinary Design Optimization for Occupant Safety: Leveraging Your LS-DYNA® Simulations
Gaëtan Van den Bergh, Yves Lemmens - LMS International
Automotive companies have become increasingly educated in safety related performance, setting the bar higher for automotive crashworthiness. Process Automation and Design Optimization (PIDO) tools help LS-DYNA users to reach these safer designs in a shorter period. In this paper, various application cases are used to demonstrate how PIDO tools can leverage your existing simulation codes. In the first application case, a multi-disciplinary ...
Direct Multi-objective Optimization through LS-OPT® using Small Number of Crashworthiness Simulations
Tushar Goel, Nielen Stander - Livermore Software Technology Corporation
Yih-Yih Lin - HP
Genetic algorithms typically require a large number of simulations, which would be economically prohibitive for crash simulations without the advent of today’s cost-effective multi-core computers. A study is conducted to seek improvements while restricting the number of simulations and exploiting the ability to use parallelization. The parallelization, achieved by simultaneously running multiple simulations for each GA generation on a HP ...
Simulation of Acoustic and Vibro-Acoustic Problems in LS-DYNA® using Boundary Element Method
Yun Huang - Livermore Software Technology Corporation
Mhamed Souli - University of Lille, France
The present work concerns the new capability of LS-DYNA® in solving acoustic and vibro-acoustic problems. In vibro-acoustic problems, which are assumed to be weak acoustic-structure interactions, the transient structural response is computed first. By applying the FFT, it is transformed into a frequency response. The obtained result is taken as boundary condition for the acoustic part of the vibro-acoustic problem. Consequently, the radiated ...
Development of an Airbag Landing System for the Orion Crew Module
Benjamin Tutt - Airborne Systems
R. Keith Johnson, Karen Lyle - NASA Langley Research Center
Airborne Systems (formally Irvin Aerospace Inc) has developed an Airbag Landing System design for the Orion Crew Module of the Crew Exploration Vehicle. This work is in support of the NASA Langley Research Center Landing System Advanced Development Project. Orion is part of the Constellation Program to send human explorers back to the moon, and then onwards to Mars and other destinations in the Solar System. A component of the Vision for ...
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