Personal tools
Home 8th International LS-DYNA Conference

restrict search to current section
For a simple text search, enter your search term here. Multiple words may be found by combining them with AND and OR. The text in this field will be matched with items' contents, title and description.


8th International LS-DYNA Conference

Fast New Methodology for Regulatory Test Simulation
Velayudham Ganesan, David Piesko, Jean-Louis Duval - ESI Group
Preparing a simulation model for a crashworthiness or occupant safety regulatory test is often a time consuming task. This paper describes a new methodology that significantly reduces this modeling time, down to minutes. Using predefined FMVSS standards, EASi-Process allows users to access ready made test templates for common runs (such as FMVSS 201, 208, 581...). With the integration of EASi-Process, EASi-CRASH DYNA, premier pre and post ...
Rapid Development of Multiple Fold Patterns for Airbag Simulation in LS-DYNA Using Oasys Primer
Miles Thornton, Richard Sturt, Anastasia Kalabina - Arup
The creation of folded meshes for airbag deployment simulations is a time consuming task. The fold pattern has a significant effect on the speed and shape of deployment of the airbag, and therefore should be modelled when prediction of deployment timing is required, as is the case with out of position analysis for FMVSS 208. To investigate changes in fold patterns or airbag shape involves repeating the entire airbag mesh process for ...
VPG Solutions Using MotionView
Michael White - Altair Engineering
The MotionView® product has been extended in version 6.0 to support LS-DYNA input and output. MotionView is a template based pre and post processor with a long history in the automotive industry. An example of an automotive handling event, and several examples of durability events will be shown. A vehicle model with a complete powertrain (engine and transmission) will be simulated, to demonstrate the “plug and play” templated model ...
Immersive Visualization and Collaboration with LS-PrePost-VR and LS-PrePost-Remote
Todd J. Furlong - Inv3rsion, LLC
This paper describes two new branches of LS-PrePost that are designed to work together to extend LS-PrePost with immersive visualization and collaboration capabilities. LS-PrePost-VR supports immersive visualization on a wide range of immersive displays, including CAVE-like devices, large-screen displays, and head-mounted displays. The software can run on either a single computer, a visualization cluster, or an SMP machine. By itself, ...
Computer Simulated and Experimental Verification of Tooling for Progressive Deep Drawing.
Peter Kostka, Peter Cekan - Slovak University of Technology in Bratislava
The ability to predict different process conditions in deep drawing is essential for die face designers, tooling, stamping and manufacturing engineers. These predictions in turn affect the speed, accuracy and cost of the final produced product. This paper briefly discusses the possibilities of controlling the blankholder pressure distribution and shows some computer simulations done in DYNAFORM, with the results being experimentally verified ...
Learning Module for using Dynaform® to Study the Effects of Die-Entry and Punch-Nose Radii on Drawing Cups
W.K. Waldron, R. Echempati, C.J. Hoff, P. Zang - Kettering University
The new model for an entry-level engineer in the United States automotive industry is that of a design engineer, one who is capable of part design and analysis using advanced CAE tools such as solid-modeling, mechanical systems dynamics (MSD), finite element analysis (FEA), and computational fluid dynamics (CFD). Since this will require a major change and enhancement of the current undergraduate engineering curriculum, the Mechanical ...
Simulation and Analysis of the Beverage Can Necking Process Using LS-DYNA
A. Jordan-Cordera, J.C. Miranda-Valenzuela - ITESM Campus Toluca
Due to their large production quantities, beverage cans have been the subject of many studies. Such studies have as objectives to increase the level of understanding of the structural behavior of the can as well as its manufacturing process. In this work, the necking process is studied by means of a parameter response study carried out with the help of LS-DYNA. Even when the necking process is affected by many factors including can geometry, ...
Determination of Optimal Cutting Conditions in Orthogonal Metal Cutting Using LS-DYNA with Design of Experiments Approach.
David P. Masillamani, Jack Chessa - University of Texas at El Paso
Optimal selections of cutting conditions contribute significantly to the increase in productivity and reduction in costs of machining processes. The main objective of the present paper is to explore the resultant temperature formed due to complicated interactions and between rake angle, depth of cut and cutting speed. Finite element simulations using LS-DYNA is used as a numerical experiment in the construction of a Design of Experiment (DOE) ...
An Eulerian Finite Element Model of the Metal Cutting Process
A. Raczy, W. J. Altenhof, A. T. Alpas - University of Windsor
The Eulerian element formulation was employed in the modeling of the orthogonal metal cutting process of commercial purity copper. The constitutive material models elastic-plastic hydrodynamic and Johnson-Cook, were utilized in modeling the workpiece behavior. The capabilities of each model to replicate the experimental chip geometry, stress and strain distributions, and cutting forces, were investigated. The numerical strain ...
Review of Sheet Metal Forming Simulation Progress to Date, Future Developments
Trevor Dutton - Dutton Simulation Ltd
Sheet metal forming simulation is a well established application of LS-DYNA. Originally used for trouble shooting, it is now increasingly accepted as a method for testing tooling design prior to manufacture; however, there are further opportunities to apply such methods as early as possible, even in the product design stage. This paper reviews the advances of recent years and presents an example of typical current applications; the tools now ...
FEA - Simulation of Bending Processes with LS-DYNA
Peter Gantner, Herbert Bauer - Aalen University, Germany
David K. Harrison, Anjali K. M. De Silva - Glasgow Caledonian University, United Kingdom
Over the past few years new car body concepts have space frame structures. The consequent application of space frames results in a reduction of weight, fuel consumption, and costs of a body while maintaining a high safety standard. These structures consist mainly of closed profiles and hydroformed components. Prior to the hydroforming process, the profiles are usually pre-bent. The bending of tubes is a crucial step in the ...
Implicit and Explicit Finite Element Simulation of Soft-Pad Grinding of Silicon Wafers
A.H. Zhao , Z.J. Pei, X.J. Xin - Kansas State University
Silicon wafers are used to fabricate more than 90% of all integrated circuits. Surface grinding is the preferred technique used to flatten wire-sawn wafers. While conventional grinding is not effective in removing the waviness induced by wire-sawing process, experiments and finite element analysis indicated that soft-pad grinding is a promising method to remove waviness effectively. This paper presents the simulations of the process of the ...
FEA - Calculation of the Hydroforming Process with LS-DYNA
Michael Keigler, Herbert Bauer - Aalen University, Germany
David K. Harrison, Anjali K. M. De Silva - Glasgow Caledonian University, United Kingdom
The automotive industry is constantly searching for product improvements concerning weight reduction and the need for corrosion resistance. Currently aluminium alloys are of special interest because of their low density of 2.76 g/cm3, and good corrosion resistance. The disadvantage of aluminium alloys is poor formability in comparison to steel. Therefore, new forming methods are demanded such as the “tube hydroforming” process, which has ...
Virtual Try Out and Process Optimization for an Innovative Conic Poles Production Concept
A. Anglani, G. Papadia - University of Lecce, Italy
A.Del Prete - Altair Engineering s.r.l.
This paper describes how the production Process for conic poles has been reviewed in order to provide innovative solutions for the forming process which has been considered the most critical operation. Finite Element Analysis using an explicit code has provided a virtual way to investigate possible solutions evaluating advantages or disadvantages before that any prototype tool has been developed. More than one solution was possible, FEA ...
A Process of Decoupling and Developing Optimized Body Structure for Safety Performance
John M. Madakacherry, Martin B. Isaac, Dr. Charles A. Bruggeman - General Motors
Dr. David Eby - CD-Adapco
Dr. Akbar Farahani - ETA, Inc.
Dr. Ron C. Averill - Red Cedar Technology
A large class vehicle meeting NCAP front crash and 40-mph 40% Offset Deformable Barrier (ODB) Impact performance was modified and tested to verify a new load path strategy using hydroformed structure and new analytical tools to reduce the mass of the vehicle while meeting the same or better performance as in the original design. The new approach was used for developing the load path strategy of a complex system model by decomposing it into ...
FE Analysis of Contact Interaction Between Rigid Ball and Woven Structure in Impact Process
Alexey I. Borovkov, Igor B. Voinov - St.Petersburg State Polytechnical University
The current paper presents the results of finite element solution of the problems simulating contact interaction between woven structures and striker in the form of rigid ball. The woven structure is represented by a great number of the fibers braided in such way that each of them can come into contact interaction with others. In this paper the analysis results for ball impact direction effect on the woven structure dumping properties was ...
Numerical Modeling of Ballistic Penetration of Long Rods into Ceramic/Metal Armors
Khodadad Vahedi, Najmeh Khazraiyan - Louisiana Tech University
Penetration into ceramic/armor targets are of prime importance in research as well as industry and military applications. The recent advances in this field shows considerable improvements in the design of armor and civilian technology. Due to complexity of the problem and interdisciplinary of the subject, most of the works in this respect are experimental in nature. The cost of experimentation is high and the results obtained cannot be ...
Blast Impact on Aluminum Foam Composite Sandwich Panels
Rajan Sriram, Uday K. Vaidya - The University of Alabama at Birmingham
Sandwich aluminum foam structures are being considered for energy absorption applications, crashworthiness, protection of transformer housings, and structural safety. Blast loading is one such phenomenon that is a potential threat to such structures. This study examines LS-DYNA modeling for aluminum foam sandwich composites subjected to blast loads. The sandwich composite was designed using polymer composite facesheets and aluminum foam as ...
Predictive Numerical Modeling of Foreign Object Damage
Pierangelo Duó, David Nowell - University of Oxford
During service aircraft engines may suffer foreign object damage (FOD) from ingestion of small hard particles and then are subjected to a range of HCF-LCF cycles. Manufacturers are seeking to improve the FOD tolerance of engines at the design stage and thereby reduce the costs of ownership. A design methodology is therefore required with which to assess the loss of fatigue strength resulting from FOD on blades or vanes. This work describes ...
Nonlinear Finite Element Analysis of Airport Approach Lighting Structures under Impact Loading
M. Nejad Ensan, D.G. Zimcik - National Research Council Canada
S.T. Jenq, F.B. Hsiao - National Cheng Kung University, Taiwan
This paper describes computer simulation of the impact of airport approach lighting structures using the LS-DYNA nonlinear finite element analysis (FEA) software. Two tower designs were investigated in this simulation. First, a finite element model (FEM) was developed to simulate the impact of a representative tower typical of those used at Canadian airports. This was 6.6 m tall tower with a triangular cross section made of aluminum. The ...
Modeling of Welded Structures Residual Strains
Sergey Medvedev, Maria Petrushina, Oleg Tchij - National Academy of Sciences of Belarus
This paper explores simulation techniques for prognosis residual strains of welded structures, which consist of common steel parts joined together by means of arc welding. The approach is based on longitudinal and transversal shrinkage forces, applied to the 3d-model of plastic weld zones. The calculations were made on ANSYS - LS-DYNA 970 MPP version on supercomputer SKIF-family located in United Institute of Informatics Problems ...
Vulnerability of Bridge Piers to Impact by Heavy Vehicles
Sherif El-Tawil - University of Michigan
My talk presents work undertaken to investigate the effects of vehicle collision on bridge piers. Inelastic transient finite element simulations are used to investigate the structural demands on bridge piers generated during such events, which have occurred in the past, sometimes with catastrophic consequences. Two different types of trucks and two different bridge/pier systems are used in the simulations. The approach speeds for the trucks ...
A Study on Shock Wave Propagation Process in the Smooth Blasting Technique
Masahiko Otsuka, Yamato Matsui, Shigeru Itoh - Kumamoto University
Kenji Murata, Yukio Kato - NOF Corporation. Aichi Branch, Taketoyo
Explosives can easily generate high energy and ultra-high pressure. In recent years, research on the advanced technological use of explosives is studied in various places. Here we focus on the Smooth Blasting Technique that is applied for tunnel blasting. This technique is performed to fracture concrete and to reduce the quantity of fragments, while avoiding stress concentration of ground pressure during tunnel blasting. When this technique ...
Finite Element Analysis of Unanchored Structures Subjected to Seismic Excitation
Sreten Mastilovic - Bechtel SAIC Company, LLC
The objective of this analysis is threefold: (1) to determine the residual stress distribution in two unanchored structures, the waste package and drip shield, subjected to seismic excitation; (2) to estimate the extent and spatial distribution of the area of the two structures for which the residual first principal stress exceeds certain limits; (3) to determine whether or not separation of interlocking drip shield segments occurs during the ...
Validation of LS-DYNA Computer Code for Seismic Qualification of Reactivity Control Mechanisms
A.S. Banwatt, C. Manu, C. Yao - Atomic Energy of Canada Ltd.
Reactivity control mechanisms of CANDU reactors fall under two categories: The first are mechanisms to control the reactivity and power output of the reactor and the second are mechanisms to control the reactor and provide instrumentation for indication. In this paper the shut off mechanism, which is of the second category, is analyzed to seismically qualify it using LSDYNA, a general-purpose finite element computer code based on ...
A Summary of the Space Shuttle Columbia Tragedy and the Use of LS-DYNA in the Accident Investigation and Return to Flight Efforts
Matthew Melis, Kelly Carney - NASA Glenn Research Center
Jonathan Gabrys - Boeing
Edwin L. Fasanella - US Army Research Laboratory/VTD
Karen H. Lyle - NASA Langley Research Center
On February 1, 2003, the Space Shuttle Columbia broke apart during reentry resulting in loss of 7 crewmembers and craft. For the next several months an extensive investigation of the accident ensued involving a nationwide team of experts from NASA, industry, and academia, spanning dozens of technical disciplines. The Columbia Accident Investigation Board (CAIB), a group of experts assembled to conduct an investigation independent of NASA ...
Development of Shipping Package Drop Analysis Capability at Westinghouse
J. F. Staples - Westinghouse Electric Company LLC1
M. Pitzer, P. A. DuBois - Hermes Engineering
Westinghouse Electric Company LLC1 is currently developing a new shipping package for transporting nuclear fuel to customer sites. This new design is designated as the TravellerTM shipping package.2 One of the many licensing requirements for the Traveller package is to demonstrate it will always maintain the fuel assembly in a (nuclear) non-critical configuration after being dropped from 9 meters onto an unyielding surface and from 1 meter ...
Experiences with LS-DYNA Implicit MPP
Cleve Ashcraft, Roger Grimes, Bradley Maker - Livermore Software Technology Corporation
SPH Performance Enhancement in LS-DYNA
Gregg Skinner, Dennis Lam - Advanced Technical Computing Center
Masataka Koishi - Yokohama Rubber Corporation
Hiroki Shimamoto - NEC Corporation
The Smoothed Particle Hydrodynamic (SPH) method had been implemented in LS-DYNA for some time. However, SPH had not been used extensively; therefore, performance issues were never highlighted and never addressed. Recent efforts to run SPH on NEC SX systems revealed substantial performance problems. NEC, Yokohama Rubber Corporation and LSTC collaborated to enhance the performance of SPH. As a result, the performance of SPH function in LS-DYNA ...
Determining the MPP LS-DYNA Communication and Computation Costs with the 3-Vehicle Collision Model and the Infiniband Interconnect
Yih-Yih Lin - Hewlett-Packard Company
The least square error approach applied to LS-DYNA communication and computation costs for the Neon model was shown previously by this author to be useful in predicting performance on a given interconnect of known ping- pong latency and bandwidth, and both Gigabit Ethernet and HyperFabric 2 results were presented. In this paper, this prediction method is applied to a much larger public-domain crash model, the 3-vehicle collision model, ...
Improving Crash Analysis by Increasing Throughput of Large-Scale Simulations
Dale I. Dunlap, Shawn Freeman - Platform Computing
Numerical simulation is an important tool used by engineers to design and develop safe automobiles. As engineers study larger and more complex models, demand for computational throughput increases. Grids allow a company to utilize its existing hardware investment to build a cost-effective platform for simulating automotive crash testing. This paper will discuss how grid technology can substantially increase computational throughput of ...
LS-DYNA Communication Performance Studies
Ananthanarayanan Sugavanam, Guangye Li - IBM
In recent years, MPP-DYNA, the message passing parallel version of LS-DYNA, has become more and more popular in car crash and metal stamping simulations due to its good scalability which may reduce the turn-around time significantly when more processors are used. However, so far, most users only use 16 or less processors for LS-DYNA simulation because of the limitation of the scalability on a larger number of processors. This paper analyzes ...
Formability Modeling with LS-DYNA
Torodd Berstad, Odd-Geir Lademo, Ketill O. Pedersen - SINTEF Materials and Chemistry
Odd S. Hopperstad - Norwegian University of Science and Technology
This paper presents how the process of loss of stability, as described by the classical theory of Marciniak and Kuczynski, can be represented in non-linear finite element analyses with LS-DYNA. As will be seen, this is strongly dependent upon proper constitutive equations and parameters for the sheet material at hand. Of this reason two user-defined sub-routines for weakly and strongly textured aluminum alloys, respectively, have been ...
Application of LS-DYNA in Identifying Critical Stresses Around Dowel Bars
Samir N. Shoukry, Gergis W. William, Mourad Riad - West Virginia University
A detailed 3D Finite Element (3DFE) Model is developed to examine the triaxial state of contact stress that develops around the dowel bars due to both traffic and thermal loads. Dowel bars are modeled using 8-node solid brick elements. Sliding interfaces with friction that permit separation are modeled along the full cylindrical surface between each dowel and the surrounding concrete. The model results are validated through comparison ...
A Model for Process-Based Crash Simulation
O.G. Lademo, T. Berstad, - SINTEF Materials and Chemistry, Norway.
T. Tryland - Hydro Aluminium Structures, Norway.
T. Furu - Hydro Aluminium R&D, Norway
O.S Hopperstad, M. Langseth - Norwegian University of Science and Technology
Manufacturing of a bumper system from aluminium extrusions often involves series of forming operations performed in the soft W temper condition, and then artificially age-hardening the components to the material's peak hardness T6 condition. It is perceptible that correct numerical representation of the crash performance of the resulting systems must rely upon a geometry obtained from a model following the process route, i.e. ...
Theory and Evaluation of Concrete Material Model 159
Yvonne D. Murray - APTEK, Inc.
The roadside safety community supplements real world crash test data with LS-DYNA simulations performed on the computer. The accuracy of the simulations depends, in part, upon the material models that are formulated to simulate the behavior of the roadside structures and vehicle materials. One important roadside structural material is concrete. A comprehensive concrete material model was developed, implemented in the LS-DYNA finite element ...
Implementation of a Constitutive Model for Aluminum Foam Including Fracture and Statistical Variation of Density
A. Reyes, O. S. Hopperstad, T. Berstad, M. Langseth - Norwegian University of Science and Technology
An existing constitutive model applicable to aluminum foam was implemented in LS-DYNA. One main objective in the present project was to implement a model that could handle fracture in the foam. Therefore, two simple fracture criteria were also implemented in the model. Additionally, the possibility to include initial statistical variation of the foam density was incorporated in the model so that inhomogeneities in the foam properties could be ...
Modeling Crushable Foam for the SAFER Racetrack Barrier
Robert W. Bielenberg and John D. Reid - University of Nebraska-Lincoln
One of the key components in the new SAFER barrier being installed at many IRL and NASCAR racetracks is the foam blocks placed between an outer steel tube structure and the existing concrete wall. Simple polystyrene insulation foams were proven to have good energy absorbing capabilities and were used as a primary means of energy absorption in the barrier. This foam is very low cost and easy to obtain. Foam research began with obtaining ...
Investigation of dsDNA Stretching Meso-Mechanics Using LS-DYNA
C. A. Yuan, K. N. Chiang - National Tsing Hua University,
This paper proposes a novel mathematical model for studying the entropic elasticity and cooperative extensibility of double strand DNA (dsDNA) using LS-DYNA and equivalent theory. Through the proposed model, the dynamic structural transitions of the dsDNA under external force/torque can be accurately simulated within an affordable CPU time. Moreover, the proposed dsDNA model comprises the meso-mechanics equivalent theory of single molecule ...
The Effects of Numerical Result and Computing Time Due to Mass Scaling in Rolling Analysis
J.Y. Chin, S.W. Lee, S.H. Paik, W.S. Chung - Theme Engineering Inc.
To enhance the structural performance for vehicle, a patch is attached. For various section shapes, each patch has different performance in energy absorption. In despite of efficient patch, formability may be a problem. Because the depth of groove is about 0.2mm, it needs a large FEM model for rolling analysis and has very small time step. We have to choose a method to reduce analysis time. This paper presents the effects of mass scaling in ...
Investigation of the Arbitrary Lagrangian Eulerian Formulation to Simulate Shock Tube Problems
C.P. Salisbury, D.S. Cronin, F.S. Lien - University of Waterloo
A critical step in modeling complex problems using numerical simulations is validating the numerical approach using simplified problems. The current study investigates application of the Arbitrary Lagrangian Eulerian (ALE) formulation, as implemented in LS-DYNA, to simulate a pseudo 1-D shock tube problem. The shock tube problem was selected since analytical results can be directly determined from the initial conditions. A shock tube is ...
Modeling of Fuel Sloshing Phenomena Considering Solid-Fluid Interaction
Jean Ma, Mohammad Usman - Plastics Products and Processing CAE Visteon Corporation
The sloshing phenomenon in partially filled fuel tanks is more pronounced when vehicles experience a sudden start or stop. Sloshing is un-desired because it produces noise, high impact force on the tank walls and the challenge of low fuel handling. Today, the solution for containing sloshing is to incorporate baffles inside the tank. The presence of baffle dissipates the energy that is induced by the fuel motions. Design of baffles is a ...
The Use of LS-DYNA to Simulate the Water Landing Characteristics of Space Vehicles
Benjamin A. Tutt, Anthony P. Taylor - Irvin Aerospace Inc
Irvin Aerospace, Inc. has been involved with the recovery/landing systems of re-entry and interplanetary space vehicles spanning a number of years. A significant aspect in the assessment of recovery and escape systems is the performance of such vehicles in the event of a water landing. One method used to reduce the loads imparted to the crew as the vehicle enters the water is to increase the drag area of the falling body. Increasing the drag ...
A Mesh-free Analysis of Shell Structures
C. T. Wu, Yong Guo - Livermore Software Technology Corporation
Hui-Ping Wang, Mark E. Botkin - General Motors
A mesh-free formulation based on the Mindlin-Reissner shell theory for geometrical and material nonlinear analysis of shells is presented. In this mesh-free formulation, two projection methods are developed to generate the shell surface using the Lagrangian mesh-free interpolations. The updated Lagrangian theory underlying the co-rotational procedure is adopted for the local strain, stress and internal force updating. A local boundary ...
Improved LS-DYNA Parallel Scaling From Fast Collective Communication Operations on High-Performance Compute Clusters
Lars Jonsson, Tim Prince - Intel Corporation
Fast collective communications are a key to maintaining high parallel efficiency as the number of nodes increases on a cluster of high-performance servers. Profiling of LS-DYNA message traffic demonstrates that good parallel scaling requires fast communications of short messages - up to a few kilobytes - and in particular of collective operations involving short messages. Fast collective operations require both an efficient implementation of ...
Benefits of Scalable Server with Global Addressable Memory for Crash Simulation
Christian Tanasescu, Nick Meng - SGI Inc.
A wide variety of industries rely on mechanical computer-aided engineering (CAE) to improve design quality, reduce design-cycle time, and control costs. In designing automobiles, the manufacturers must meet different government regulations for vehicle safety. The maturity of Explicit Finite Element methods and the increasing computational power of today's computers have allowed the automotive industry to incorporate the Crash simulation ...
Improved LS-DYNA Performance on Sun Servers
Youn-Seo Roh, Henry H. Fong - Sun Microsystems, Inc.
Current Sun platforms which are very competitive in price/performance include Linux servers using either the Intel Xeon or AMD Opteron processors. Benchmark results using the industry-standard Neon model are presented. Performance and scalability up to 32 CPU's are discussed, as well as a comparison of use of gigabit Ethernet (GBE) interconnect versus Myrinet in a Linux Xeon cluster. Current status of Solaris x86 porting of LS- DYNA is also ...
Modeling the Nonlinear, Strain Rate Dependent Deformation of Shuttle Leading Edge Materials with Hydrostatic Stress Effects Included
Robert K. Goldberg, Kelly S. Carney - NASA Glenn Research Center
An analysis method based on a deformation (as opposed to damage) approach has been developed to model the strain rate dependent, nonlinear deformation of woven ceramic matrix composites, such as the Reinforced Carbon Carbon (RCC) material used on the leading edges of the Space Shuttle. In the developed model, the differences in the tension and compression deformation behaviors have also been accounted for. State variable ...
Material Modeling of Space Shuttle Leading Edge and External Tank Materials For Use in the Columbia Accident Investigation
Kelly Carney, Matthew Melis - NASA Glenn Research Center
Edwin L. Fasanella - US Army Research Laboratory/VTD
Karen H. Lyle - NASA Langley Research Center
Jonathan Gabrys - Boeing
Upon the commencement of the analytical effort to characterize the impact dynamics and damage of the Space Shuttle Columbia leading edge due to External Tank insulating foam, the necessity of creating analytical descriptions of these materials became evident. To that end, material models were developed of the leading edge thermal protection system, Reinforced Carbon Carbon (RCC), and a low density polyurethane foam, BX-250. Challenges in ...
K. Lyle - NASA Langley Research Center, Hampton VA
E. Fasanella - ARL-VTD Langley Research Center, Hampton VA
M. Melis and K. Carney- NASA Glenn Research Center, Cleveland OH
J. Gabrys -The Boeing Company, Philadelphia PA
The Space Shuttle Columbia Accident Investigation Board (CAIB) made several recommendations for improving the NASA Space Shuttle Program. An extensive experimental and analytical program has been developed to address two recommendations related to structural impact analysis. The objective of the present work is to demonstrate the application of probabilistic analysis to assess the effect of uncertainties on debris impacts on Space ...