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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
331

A finite element method for unsteady heat conduction in materials with or without phase change /

Ronel, Yoav. January 1980 (has links)
No description available.
332

The Steepest Descent Method Using Finite Elements for Systems of Nonlinear Partial Differential Equations

Liaw, Mou-yung Morris 08 1900 (has links)
The purpose of this paper is to develop a general method for using Finite Elements in the Steepest Descent Method. The main application is to a partial differential equation for a Transonic Flow Problem. It is also applied to Burger's equation, Laplace's equation and the minimal surface equation. The entire method is tested by computer runs which give satisfactory results. The validity of certain of the procedures used are proved theoretically. The way that the writer handles finite elements is quite different from traditional finite element methods. The variational principle is not needed. The theory is based upon the calculation of a matrix representation of operators in the gradient of a certain functional. Systematic use is made of local interpolation functions.
333

Bridging Scale Simulation of Lattice Fracture and Dynamics using Enriched Space-Time Finite Element Method

Chirputkar, Shardool U. 23 September 2011 (has links)
No description available.
334

A Feasiblity Study on the Fatigue Performance of Laser Beam Welds and Hybrid-Laser Arc Welds Used in an Innovative Modular Steel Sandwich Panel Bridge Deck SyStem

Passarelli, Garrett J. 09 November 2011 (has links)
This research investigation explores the feasibility of implementing a laser welded sandwich steel panel bridge deck system as a viable alternative to standardized reinforced concrete bridge decks. Generally used in naval ship building applications, steel sandwich panels possess attractive characteristics towards the integration with bridge infrastructure such as service life in excess of 100 plus years, dead load reduction, rapid construction, decreased closure time, and automated mass production. The lack of fatigue data for the laser "stake" welds used to create the enclosed sandwich panel geometry raised concerns with respect to fatigue life. The primary focus of this study was to determine whether or not infinite fatigue life was possible. Two different laser welding technologies were investigated, Laser Beam Welding (LBW) and Hybrid-Laser Arc Welding (HLAW). Test specimens were fabricated and tested in order to examine fatigue resistance based on a localized load effect between adjacent core stiffeners. Finite element models were used to obtain the stress range for each individual test due to complex geometry and partially restrained boundary conditions. In order to assess the fatigue performance of the overall deck system, additional finite element models were created to study the local and global behavior of different sandwich panel configurations. As a whole the investigation yielded promising results. Infinite fatigue life is achievable due to outstanding fatigue performance. The HLAW stake welds demonstrated superior fatigue resistance in comparison to the LBW process. Localized load effects can be minimized through the modification of different panel parameters. Pushing forward, full scale testing is essential to the future employment of this innovative bridge deck system. / Master of Science
335

Ultimate load analysis using finite element methods

Cimento, Arthur Peter. January 1978 (has links)
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1978 / Includes bibliographical references. / by Arthur P. Cimento. / B.S. / B.S. Massachusetts Institute of Technology, Department of Mechanical Engineering
336

A mathematical explanation of the transition between laminar and turbulent flow in Newtonian fluids, using the Lie groups and finite element methods

Goufo, Emile Franc Doungmo 31 August 2007 (has links)
In this scientific work, we use two effective methods : Lie groups theory and the finite element method, to explain why the transition from laminar flow to turbulence flow depends on the variation of the Reynolds number. We restrict ourselves to the case of incompressible viscous Newtonian fluid flows. Their governing equations, i.e. the continuity and Navier-Stokes equations are established and investigated. Their solutions are expressed explicitly thanks to Lie's theory. The stability theory, which leads to an eigenvalue problem is used together with the finite element method, showing a way to compute the critical Reynolds number, for which the transition to turbulence occurs. The stationary flow is also studied and a finite element method, the Newton method, is used to prove the stability of its convergence, which is guaranteed for small variations of the Reynolds number. / Mathematical Sciences / M.Sc. (Applied Mathematics)
337

Constitutive modelling and finite element simulation of martensitic transformation using a computational multi-scale framework

Adzima, M. Fauzan January 2014 (has links)
No description available.
338

Modelling of water absorption into carbon fibre/epoxy composites

Korkees, Feras January 2012 (has links)
No description available.
339

FINITE ELEMENT ANALYSIS OF SHELL STRUCTURES.

Noelting, Swen Erik, 1960- January 1986 (has links)
No description available.
340

Numerical and experimental damage analysis of elastic bodies containing defects

Yang, Chunhui, 楊春暉 January 2002 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy

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