The first part of the thesis describes the concepts of viscoplasticity as a continuous plasticity theory highlighting different kinds of yield functions, plastic potentials and visocplastic constitutive laws. / A 2-dimensional elasto-viscoplastic finite element model for stress/stability analysis of mining excavations has been developed for use on microcomputers. An iterative explicit time stepping scheme is implemented. The program uses automatic time-step calculator based on equations giving a limit on the time step in an attempt to prevent numerical instability when common forms of isotropic yield functions and plastic potentials are used in the viscoplastic solution. When the input data are read parallel to the analysis undertaken the user can simulate compound behaviour by stopping the analysis, examining the results graphically and restarting it again and possibly implementing a certain decision in the subsequent appended input. This also imposes no limit on the number of time stations at which instantaneous changes like elements cut, elements backfilled, loads added or simply outputs are required. The program is equipped with graphical pre- and post- processors.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.60595 |
| Date | January 1991 |
| Creators | Rizkalla, Maged Kamal |
| 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 | Master of Engineering (Department of Mining and Metallurgical Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001256025, proquestno: AAIMM72198, Theses scanned by UMI/ProQuest. |
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