Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 92 for “"dyna"”.
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LS-Dyna for Crashworthiness of Composite Structures
… are studied using a finite element solver, LS-Dyna. Three different composite tubes have been chosen for the finite element analysis, which have been crushed under impact loading conditions. Composite material models, from Dyna library, are assigned for the tubes to analyze which material model …
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A post-processor interface for CADAM NC and dyna milling machines
… post-processor interface between CAD AM NC and a DYNA milling machine. This program processes the CLDA TA file that is the output of the IBM System/370 APT-AC processor. The input to the APT-AC processor is an APT file, generated by passing CADAM NC data through the CADAM/ APT interface. The CLDA …
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Evaluation of Site Response Analysis for Vertical Ground Motions in LS-DYNA Using Geotechnical Downhole
… were selected for validation. Utilizing the LS-DYNA finite element analysis engine, the arrays were modeled as soil columns. The analysis were run under infield and outcrop boundary conditions, and under total and effective stress regimes. Initial Poisson's ratio was estimated using correlations …
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Assessment of LS-DYNA and Underwater Shock Analysis (USA) Tools for Modeling Far-Field Underwater Explosion Effects on Ships
… the use of the numerical modeling tools LS-DYNA and USA in modeling general far-field underwater explosions (UNDEX) by modeling a three-dimensional box barge that is subjected to a far-field underwater explosion. Past UNDEX models using these tools have not been validated by experiment and …
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Finite element modeling of energy-absorbing materials in blast-loaded structures
… so computational models were created in LS-DYNA to understand the phenomenon that causes an increase in transferred energy. Many models using ConWep and Arbitrary-Lagrangian-Eulerian (ALE) techniques were created to test the loading methods available in LS-DYNA. Additional ConWep models were …
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Pressure-impulse diagrams using finite element analysis for reinforced concrete columns subjected to blast loading
… enhancement of three material models of LS-DYNA subjected to high strain rates is studied. The effects of strain rate and lateral inertial confinement on the strength enhancement are investigated. Recommendations are made to improve the accuracy of the results of future numerical simulations …
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Evaluation of the Tensile Bond Strength of Orthodontic Bracket Bases Using Glass Ionomer Cement as an Adhesive
… metal bases; Micro-Lock™ photo-etched bases; Dyna-Lock™ integral bracket/bases; and ceramic silane-coated bracket pads. Groups contained 20 to 22 specimens that were bonded to bovine incisor teeth embedded in a self-curing acrylic block that could be held in the testing machine. …
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Finite Element Analysis and Experimental Validation of Reinforced Concrete Single-Mat Slabs Subjected to Blast Loads
… twelve RC slabs subjected to blast loading. LS-DYNA®, a non-linear transient dynamic finite element analysis program, was used in this study. Finite element models for twelve slabs using the LS-DYNA® subjected to experimental blast loads were used to study the bond-slip behavior between steel …
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Dynamic Analysis of CubeSat Impact on Lunar Surface
… vibration analysis, NASTRAN simulation, LS-DYNA simulation and a full scale drop test. The outcomes from this work are that the structure of EagleCam will survive the impact given that the shock isolation system chosen will mitigate some of the shock without exciting any of the CubeSat’s …
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Finite Element Analysis of a Golf Ball and Driver Head Impact: Understanding the Feasibility of an Acoustical Optimization
… an impact. A validation of the FEA program LS-DYNA® was undertaken to ensure a proper solution was attained in the software analysis. An experimental and theoretical validation was performed that involved firing a golf ball at a titanium plate and comparing data from the impact to FEA …
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Evaluation of Elastic-Plastic and Damage Models for Ultra High Performance Concrete (UHPC)
… the Continuous Surface Cap Model (CSCM) in LS-DYNA. ABAQUS and LS-DYNA are two widely used finite element analysis (FEA) codes. The constitutive models were calibrated using laboratory data from three different materials: two types of HPCs without fibers with compression strengths of 70MPa and …
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Designing, manufacturing, testing, and modeling motorcycle helmets using hybrid composite systems
… were carried in the finite element (FE) LS-DYNA workbench to explore the head injury parameters in a motorcycle rider. In this study, the modeling and simulations were investigated in LS-DYNA, ANSYS, and the National Institute for Aviation Research (NIAR) composites laboratory.
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Numerical analyses of long carbon fiber reinforced concrete panels exposed to dynamic loading
… The three-dimensional finite element code LS-DYNA was used for the numerical analyses. Three different, simple input models were used to simulate concrete behavior under impact. As a consequence, both the force time history and deflection time history at failure were obtained for each case. …
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Design and evaluation of CNC-user interfaces
… of the original control panel of a CNC-Dyna machine, and Layout 2 was a modified user interface based on the analysis of the Dyna control language. Four factors were manipulated: (1) users’ level of expertise, (2) layouts, (3) tasks, and (4) trials. It was found that both groups of …
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Numerical and experimental investigation of Nylon66 (PA66) reinforced recycled carbon fiber composites and aluminum foam for application in vehicle crashworthiness and occupant protection per various FMVSS regulations
… validated to have a working and scalable LS-DYNA material card for the component level and full-scale simulations. Secondly, the component level simulations are performed on empty thin-wall square PA66 RCF tubes and aluminum foam-filled tubes to understand the compressive behavior of the …
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Alternate Load Paths and Retrofits for Long-span Truss Bridges under Sudden Member Loss and Blast Loads
… analysis and strain ratio (SR) for nonlinear dynamic analysis. Based on the possible failure modes and failure scenarios after sudden critical member loss, performance-based retrofit criteria and recommendations for 3-D ALP retrofits are proposed in terms of both DCR and SR metrics. To …
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Device driver development and implementation for work cell control
… The library of functions created for the Dyna CNC machine and the IBM 7545/7547 robots will aid the future user to create software for the workcell. By using the library functions, a user will be insulated from the lower level functioning of the machines and need only be concerned about …
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A Prediction of the Acoustical Output of a Golf Driver Head Using Finite Elements
A simulation was created using LS-DYNA® to determine the acoustical properties of a golf ball and golf driver head impact. LS-DYNA® has a coupled finite element analysis (FEA) and boundary element method (BEM) solver that uses the integral form of Helmholtz’s acoustic wave equation to deliver …
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Computational Design of Transparent Polymeric Laminates subjected to Low-velocity Impact
… implemented it in the finite element software LS-DYNA. Materials considered are polymethylmethacrylate (PMMA), polycarbonate (PC) and adhesives. The PMMA and the PC are modeled as elasto-thermo-visco-plastic and adhesives as viscoelastic. Their failure criteria are stated and simulated by the …
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Sex-Based Differences in Calcaneal Injury Tolerances Under High-Rate Loading
… lengths, the tibia and fibula were potted in Dyna-Cast®, flesh and ligaments were excised from the inferior surface of the calcaneus, and a small Dyna-Cast® pad was poured and sanded flat – interfacing with the exposed calcaneal surface. Each test specimen was mounted in a custom fixture and …
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