Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Michaels, Thomas; Committee Co-Chair: Michaels, Jennifer; Committee Member: Degertekin, Levent; Committee Member: Qu, Jianmin; Committee Member: Ruzzene, Massimo; Committee Member: Scott, Waymond. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2007. / Committee Chair: Itzhak Green; Committee Member; Jeffrey Streator; Committee Member: Richard Neu. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Inaug.-Diss.--Bonn. / Bibliography: p. 84-85.

Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering. / Bibliography: leaves 105-111. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Anna On-Nar Yau. / M.S.

Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Civil Engineering. / Bibliography: leaves 106-111. / M.S.

In this paper, a numerical method is used to predict the response of an elastic body during a collision in which both normal and tangential impulses are important. Results are compared with those from simplified prediction procedures, which stem from the assumptions that the energy-returning capacity of the normal deformation mechanism is constant and the tangential compliance is neglected. The finite-element predictions indicate the importance of the tangential compliance for elastic collisions wherein friction forces are significant. The results of both methods of prediction point up the roles of friction and inertia coupling in determining the normal velocity ratio (the "coefficient of restitution"). / Graduation date: 1992

This work presents the results of Finite Element Analyses (FEA) used to simulate sliding contact in two (2D) and three dimensions (3D) between two interfering elasto-plastic bodies. Cylinders are used to model sliding contact in 2D, simplified by the assumption of plane strain. Sliding is studied between two cylinders modeled with material properties of steel, and separately with a Glidcop cylinder sliding over an Al 6061-T651 cylinder. All materials are modeled as elastic-perfectly plastic and follow the von Mises yield criterion. Both frictionless as well as frictional sliding are investigated. The FEA results in trends in the deformation, reaction forces, stresses, and net energy loss as a function of sliding distance. All these results are found to be related to the magnitude of vertical interference. This work shows that for the plastic loading cases of frictionless sliding, the ratio of the vertical force to the horizontal reaction force is not zero at the point where the bodies are perfectly aligned about the vertical axis. This work also presents empirical equations that relate the net energy loss due to sliding under an elasto-plastic deformation as a function of the sliding distance. In addition, a load ratio of the horizontal reaction force to the vertical one is defined for frictionless sliding. Although this is analogous to the common definition of the coefficient of friction between sliding surfaces, it just contains the effect of energy loss in plasticity. The contact dimensions are obtained for different vertical interferences as sliding progresses. Comparisons are drawn between the FEA results of frictional and frictionless sliding. 3D modeling has been initiated to yield similar result parameters.

This work presents a three dimensional elastic-plastic model for two hemispherical bodies sliding across one another under various preset vertical interferences. In particular, steel-on-steel and aluminum-on-copper contact situations are considered. A finite element analysis is used for the model and the parameters to investigate include stresses, deformations, contact areas, and energy loss in sliding. Both frictional and frictionless sliding are investigated. In addidition to structural loads, electromagnetic loads are considered and a framework for a electromagneticlly, structurally, and thermally coupled model is investigated.

Thesis (Ph. D.)--University of Missouri-Columbia, 2000. / Typescript. Vita. Includes bibliographical references (leaves 182-188). Also available on the Internet.