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Title: Discrete elements in transient dynamics of fractured media
Author: Munjiza, Ante
Awarding Body: Swansea University
Current Institution: Swansea University
Date of Award: 1992
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A discrete element methodology capable of analysing a wide range of discrete materials, with the emphasis being placed on the dynamic behaviour of fracturing rock masses is presented. Standard problems that appear in any discrete element method are discussed as follows: a) contact detection and interaction among bodies in contact b) model of solid material a discrete element consists of Coordinate based space-cell decomposition, space searching using binary tree, direct evidence approach to contact detection and direct checking approach to contact detection have all been combined in a robust contact detection algorithm presented in the thesis. Interaction among bodies in contact is solved by introducing a concept of the contact element. Deformability is dealt with by discretisation of individual bodies into finite elements. Finite strain formulation using logarithmic stretches as a strain measure is considered in combination with an isotropic strain softening material. A fracture criterion based on isotropic strain softening assumptions is developed. Iso-h approach is applied to deal with mesh sensitivity. Finally an attempt to model rock blasting is made. A model that includes flow of the detonation gas through fracturing rock is presented. At the end some examples that illustrate possible applications of presented methodology in practical engineering problems are given. Some computational issues are discussed as well, including object oriented coding, unpredictibility and possible chaotic behaviour of systems with large number of bodies.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available