This thesis is concerned with the experimental evaluation of the volumetric deformation of a two-phase medium at the microscopic level. The basic definitions of the significant parameters involved in the mechanical response behaviour of the structured medium are based on the concepts of Probabilistic Micromechanics. A simple phenomenological model and the leading structural parameter $ theta sb{s}$ (Solid phase volume fraction) are discussed briefly. The experimental work makes use of a series of macroscopic tests to attain different states of deformation so that the evolution of the internal microstructural changes can be analyzed. The combined use of ultramicrotomy techniques and the Scanning Electron Microscopy operating in the Backscattered Electron mode allowed the quantification of the microstructural changes at large magnifications. The concepts of practical Stereology were adopted for the quantification of a large number of observation areas representative of the complete phenomenon to determine the leading structural parameter $ theta sb{s}.$ A semi-automatic system was developed for the determination of $ theta sb{s}$ corresponding to each observation area. A fully-automatic image analyzer also was used for the evaluation of the first state of deformation. The experimental procedure employed in this investigation is described in detail and its application is illustrated by the evaluation of $ theta sb{s}$ and its evolution at the microscopic level. The evaluations of the distributions of this parameter also are shown. In the conclusion of this thesis, the obtained results for the Al-Quetol are discussed and general remarks concerning the experimental technique and its application to other structured media are indicated.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.70342 |
| Date | January 1991 |
| Creators | Turcott Rios, Eduardo Enrique |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Mechanical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001274308, proquestno: AAINN74910, Theses scanned by UMI/ProQuest. |
Page generated in 0.0017 seconds