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A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials / MAHSHID RANJBARESTALKHJANI

Swansea University Author: MAHSHID RANJBARESTALKHJANI

DOI (Published version): 10.23889/SUthesis.59101

Abstract

The objective of this work is to determine an e˙ective yield criteria for porous pressure sensitive solids and investigate the anisotropic yield behavior by employing a virtual testing strategy. The work is concerned with the pressure sensitivity typically displayed by geometarials, such as sandston...

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Published: Swansea 2022
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Peric, Djordje
URI: https://cronfa.swan.ac.uk/Record/cronfa59101
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first_indexed 2022-01-06T13:38:22Z
last_indexed 2022-01-07T04:26:50Z
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spelling 2022-01-06T13:52:36.2509142 v2 59101 2022-01-06 A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials 4cbbef12fa021b63fa2ef9ed93b3e75c MAHSHID RANJBARESTALKHJANI MAHSHID RANJBARESTALKHJANI true false 2022-01-06 The objective of this work is to determine an e˙ective yield criteria for porous pressure sensitive solids and investigate the anisotropic yield behavior by employing a virtual testing strategy. The work is concerned with the pressure sensitivity typically displayed by geometarials, such as sandstone and composite materials consisting of a series of parallel layers, such as sedimentary rock and underground salt.Virtual testing strategy is based on computational homogenization approach for the definition of the elasto-plastic transition. Representative volume elements (RVEs) containing single-centered and distributed ellipsoidal voids are analyzed using three-dimensional finite element models under both small and finite strains. Yield curves are obtained following a unified variational formulation, which provides bounds on the e˙ective material properties for a given choice of the Representative Volume Element (RVE).In order to estimate the e˙ective properties of porous solid, the constitutive behavior of the continuum matrix is assumed to follow the standard Drucker-Prager elasto-plastic model. The computationally generated e˙ective yield criteria are compared against the recently proposed analytical estimates for Drucker-Prager type solids and the SR4 constitutive model for soft rocks. The developed computational approach is applied to estimate the e˙ective properties of a realistic rock sample. To illustrate a wide range of potential engineering applications, the computationally e˙ective yield surface are also obtained under the explicit finite element method.Finally, based on the simulated yield stress point of composite materials, the pa-rameters for proposed analytical models are acquired with ellipse fit by Taubin’s method. E-Thesis Swansea Multi-scale, Yield criterion, Computational homogenisation, Virtual testing, Porous elasto-plastic materials 6 1 2022 2022-01-06 10.23889/SUthesis.59101 COLLEGE NANME COLLEGE CODE Swansea University Peric, Djordje Doctoral Ph.D 2022-01-06T13:52:36.2509142 2022-01-06T13:35:24.7821538 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised MAHSHID RANJBARESTALKHJANI 1 59101__22055__4f0c211791bb4b7ab696409cf734090d.pdf Ranjbarestalkhjani_Mahshid_Final_PhD_Thesis_Redacted_Signature.pdf 2022-01-06T13:43:12.6274511 Output 19591690 application/pdf E-Thesis – open access true Copyright: The author, Mahshid Ranjbar, 2021. true eng
title A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
spellingShingle A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
MAHSHID RANJBARESTALKHJANI
title_short A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
title_full A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
title_fullStr A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
title_full_unstemmed A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
title_sort A Virtual Testing Strategy to Determine Macroscopic Properties of Elasto-Plastic Heterogeneous Composite Materials
author_id_str_mv 4cbbef12fa021b63fa2ef9ed93b3e75c
author_id_fullname_str_mv 4cbbef12fa021b63fa2ef9ed93b3e75c_***_MAHSHID RANJBARESTALKHJANI
author MAHSHID RANJBARESTALKHJANI
author2 MAHSHID RANJBARESTALKHJANI
format E-Thesis
publishDate 2022
institution Swansea University
doi_str_mv 10.23889/SUthesis.59101
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description The objective of this work is to determine an e˙ective yield criteria for porous pressure sensitive solids and investigate the anisotropic yield behavior by employing a virtual testing strategy. The work is concerned with the pressure sensitivity typically displayed by geometarials, such as sandstone and composite materials consisting of a series of parallel layers, such as sedimentary rock and underground salt.Virtual testing strategy is based on computational homogenization approach for the definition of the elasto-plastic transition. Representative volume elements (RVEs) containing single-centered and distributed ellipsoidal voids are analyzed using three-dimensional finite element models under both small and finite strains. Yield curves are obtained following a unified variational formulation, which provides bounds on the e˙ective material properties for a given choice of the Representative Volume Element (RVE).In order to estimate the e˙ective properties of porous solid, the constitutive behavior of the continuum matrix is assumed to follow the standard Drucker-Prager elasto-plastic model. The computationally generated e˙ective yield criteria are compared against the recently proposed analytical estimates for Drucker-Prager type solids and the SR4 constitutive model for soft rocks. The developed computational approach is applied to estimate the e˙ective properties of a realistic rock sample. To illustrate a wide range of potential engineering applications, the computationally e˙ective yield surface are also obtained under the explicit finite element method.Finally, based on the simulated yield stress point of composite materials, the pa-rameters for proposed analytical models are acquired with ellipse fit by Taubin’s method.
published_date 2022-01-06T04:16:08Z
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score 11.035874

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