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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.
1

Nonlinear solvers for plasticity problems

Kohengadol, Roni A. January 2004 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keyword: elastoviscoplasticity. Includes bibliographical references (p. 43-44).
2

Large strain elasto-plastic soil-structure interaction analysis

鄭榕明, Cheng, Yung-ming. January 1992 (has links)
published_or_final_version / Civil and Structural Engineering / Doctoral / Doctor of Philosophy
3

Yield and geodesic properties of random elasto-plastic materials

Li, Wei, 1970 May 26- January 2008 (has links)
Two topics, i.e., the scale effects and the geodesics of random heterogeneous materials will be discussed in this work. / When the separation of scales in random media does not hold, the representative volume element (RVE) of deterministic continuum mechanics does not exist in the conventional sense, and new concepts and approaches are needed. This subject is discussed here in the context of microstructures of two types - planar random chessboards, and planar random inclusion-matrix composites -- with microscale behavior being elastic-plastic-hardening (power-law). The microstructure is assumed to be spatially homogeneous and ergodic. Principal issues under consideration are those of yield and incipient plastic flow of statistical volume elements (SVE) on mesoscales, and the scaling trend of SVE to the RVE response on macroscale. Indeed, the SVE responses under uniform displacement (or traction) boundary conditions bound from above (respectively, below) the RVE response, and we show via extensive simulations in plane stress that the larger is the mesoscale, the tighter are both bounds. However, the mesoscale flows under both kinds of loading do not, in general, display normality. Also, with the limitation imposed by currently available computational resources, we do not recover normality (or even a trend towards it) when studying the largest possible SVE domains. / The second topic is the geodesic (i.e., shortest path) character of strain fields occurring in elasto-plastic response of planar inclusion-matrix composites. The composites' spatially random morphology is created by generating the disk centers through a sequential inhibition process based on a poisson point field in plane. Both phases (inclusions and matrix) are elastic-plastic-hardening with the matrix being more compliant and weaker than the inclusions, and perfect bonding everywhere. A quantitative comparison of a response pattern obtained by computational micromechanics with that found only by mathematical morphology indicates that (i) the regions of plastic flow are very close to geodesics, and (ii) a purely geometric, and orders of magnitude more rapid than by computational mechanics assessment of these regions is possible.
4

Modeling of elastic-viscoplastic behavior and its finite element implementation /

Diehl, Ted. January 1988 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1988. / Includes bibliographical references (leaves 67-69).
5

Large strain elasto-plastic soil-structure interaction analysis /

Cheng, Yung-ming. January 1992 (has links)
Thesis (Ph. D.)--University of Hong Kong, 1992.
6

Variational formulations and numerical analysis of some problems in small strain elastoplasticity

Griffin, Terence Bernard January 1986 (has links)
Bibliography: pages 316-322. / In this thesis we study the mathematical structure and numerical approximation of two boundary-value problems in small strain elastoplasticity. The first problem, which we call the incremental holonomic problem, is based on a consistent incremental holonomic constitutive law, which in turn derives from the notion of extremal paths in stress and strain space as originally proposed by PONTER & MARTIN (1972); the second problem which we study is the classical rate problem. We show that both problems can be formulated as variational inequalities, with internal variables being included explicitly in the formulation. Corresponding minimisation problems follow naturally from standard results in convex analysis.
7

Yield and geodesic properties of random elasto-plastic materials

Li, Wei, 1970 May 26- January 2008 (has links)
No description available.
8

Nonlinear Solvers For Plasticity Problems

Kohengadol, Roni A 08 April 2004 (has links)
The partial differential equation governing the problem of elastoplasticity is linear in the elastic region and nonlinear in the plastic region. In the elastic region, we encounter the problem of elasticity which is governed by the Navier Lame equations. We present a solution to the above problem through numerical schemes such as the finite element method. problem. This is hard to achieve from a numerical point of view however. is explained and a new method to solve the problem is proposed. The path us improve Newton's method by a better choice of the initial guess. this method for the penalty parameter as close to zero as we want and thereby we obtain an exact solution to our original PDE. Plots with results are presented.
9

Elasto-plasticity of slopes and embankments

吳國樑, Ng, Kwok-leung, Axel. January 1989 (has links)
published_or_final_version / Civil and Structural Engineering / Master / Master of Philosophy
10

Holographic interferometry applications in elastic-plastic fracture mechanics

Carmel, Yves. January 1981 (has links)
No description available.

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