Constitutive Modeling of Brittle Materials (Polymer Concrete and Rock) under Triaxial Compression Loading

Jafarian Abyaneh, Mostafa | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49454 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Toufigh, Vahab
  7. Abstract:
  8. Understanding mechanical behavior of engineering materials plays an important role in prediction of material response and helps to analysis and design of engineering structures. In this thesis, behavior of polymer concrete (PC) with three different epoxy resin ratios, ordinary cement concrete (OCC), lightweight concrete (LWC), lime mortar soil (LMS), four various types of sandstone and granite was investigated under uniaxial and triaxial compression. In order to predict the mechanical behavior of aforementioned brittle materials, their behavior was simulated in terms of axial stress and volumetric strain versus axial strain. For computation of volumetric deformation and softening behavior, it was necessary to use an appropriate damage model for various types of brittle materials. In this research, an advanced constitutive model based on disturbed state concept (DSC) was proposed, which defines the material behavior to be composed of relatively intact (RI) and fully adjusted (FA) states. For modeling the RI behavior, nonlinear finite element analysis (NFEA) and hierarchical single-surface (HISS) failure criterion were used. Fully adjusted behavior was modeled based on residual stress in specimens after failure. For verification, the parameters of proposed model were extracted for three different confining pressures, and they were used for two other confining pressures to check the consistency of modeling results. Moreover, the failure pattern of PC was estimated by using ultimate disturbance values, and compared with failure plane angle obtained from experimental results and Mohr-Coulomb criterion
  9. Keywords:
  10. Polymer Concrete ; Nonlinear Finite Element Analysis ; Constitutive Modeling ; Granular Materials ; Pressure Loading ; Triaxial Compression Test ; Disturbed State Concept

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