Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components
Structures loaded cyclically beyond their elastic limit experience gradual accumulation of plastic deformations or strains which may eventually lead to material deterioration and ductile fracture. Assessing the life expectancy of their structural members requires the development and implementation o...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
The University of Edinburgh
2020
|
Subjects: | |
Online Access: | https://hdl.handle.net/1842/37517 https://doi.org/10.7488/era/801 |
id |
ftunivedinburgh:oai:era.ed.ac.uk:1842/37517 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Edinburgh Research Archive (ERA - University of Edinburgh) |
op_collection_id |
ftunivedinburgh |
language |
English |
topic |
assessing life expectancy numerical analyses experimental testing cyclic loading multi-axial material ratcheting multi-axial material ratchet simulation cyclic plasticity-damage ultra low-cycle fatigue steel welded tubular joints von-Mises yield criterion Euler-backward integration J2-flow theory isotropic continuum damage mechanics load-displacement responses |
spellingShingle |
assessing life expectancy numerical analyses experimental testing cyclic loading multi-axial material ratcheting multi-axial material ratchet simulation cyclic plasticity-damage ultra low-cycle fatigue steel welded tubular joints von-Mises yield criterion Euler-backward integration J2-flow theory isotropic continuum damage mechanics load-displacement responses Chatziioannou, Konstantinos Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
topic_facet |
assessing life expectancy numerical analyses experimental testing cyclic loading multi-axial material ratcheting multi-axial material ratchet simulation cyclic plasticity-damage ultra low-cycle fatigue steel welded tubular joints von-Mises yield criterion Euler-backward integration J2-flow theory isotropic continuum damage mechanics load-displacement responses |
description |
Structures loaded cyclically beyond their elastic limit experience gradual accumulation of plastic deformations or strains which may eventually lead to material deterioration and ductile fracture. Assessing the life expectancy of their structural members requires the development and implementation of appropriate material models into the finite element environment, using robust numerical integration schemes. It is the purpose of the present Thesis to investigate through rigorous numerical analyses and experimental testing the mechanical behaviour of metal components subjected to intense cyclic loading. Advanced numerical tools are developed to simulate multi-axial material ratcheting and cyclic plasticity-damage response in metal structural components. The ultra low-cycle fatigue of high-strength steel welded tubular joints is also investigated through large-scale experiments. An implicit numerical scheme is proposed in Chapter 2 for simulating the mechanical response of thin-walled structures subjected to inelastic cyclic loading. The constitutive model is formulated explicitly for plane stress conditions, accounts for combined kinematic/isotropic hardening and follows the von-Mises yield criterion. Emphasis is given to kinematic hardening part, which is described with an advanced multiple backstress model suitable for multi-axial material ratcheting simulation. Constitutive relations are integrated implicitly using the Euler-backward integration technique. Two main novelties of the algorithm refer to the incremental update of the internal variables through the solution of a single scalar equation, and the explicit formulation of the consistent tangent moduli. The numerical scheme is implemented into the finite element software ABAQUS (2016) as a material user-subroutine UMAT and its capabilities are demonstrated through the numerical simulation of large-scale experiments on pipe elbows, a characteristic mechanical component that experiences multi-axial ratcheting response. In the sequence, the proposed ... |
author2 |
Huang, Yuner Karamanos, Spyridon Lu, Yong |
format |
Doctoral or Postdoctoral Thesis |
author |
Chatziioannou, Konstantinos |
author_facet |
Chatziioannou, Konstantinos |
author_sort |
Chatziioannou, Konstantinos |
title |
Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
title_short |
Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
title_full |
Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
title_fullStr |
Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
title_full_unstemmed |
Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
title_sort |
experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components |
publisher |
The University of Edinburgh |
publishDate |
2020 |
url |
https://hdl.handle.net/1842/37517 https://doi.org/10.7488/era/801 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
K. Chatziioannou, Y. Huang, S. A. Karamanos. Dented Externally-Pressurised Pipes Subjected to Cyclic Axial Loading (2019). Proceedings of the ASME 38th International Conference on Ocean, Offshore and Arctic Engineering, pp. OMAE2019-95814. K. Chatziioannou, Y. Huang, S. A. Karamanos. Simulation of Piping Ratcheting Experiments using Advanced Plane Stress Cyclic Elastoplasticity Models (2019). Finalist in student competition, ASME 2019 Pressure Vessels and Piping Conference, pp. PVP2019-93507. K. Chatziioannou, Y. Huang, S. A. Karamanos. Coupled Numerical Simulation of Low-Cycle Fatigue under Plane Stress Conditions (2019). Invited lecturer in COMPLAS 2019, International Conference on Computational Plasticity. K. Chatziioannou, S. A. Karamanos, Y. Huang. Ultra Low-Cycle Fatigue Performance of S420 and S700 Steel Welded Tubular X-joints (2019). International Journal of Fatigue, 129, p. 105221 K. Chatziioannou, S. A. Karamanos, Y. Huang. An Implicit Numerical Scheme for Cyclic Elastoplasticity and Ratcheting under Plane Stress Conditions (2019). Computers and Structures K. Chatziioannou, Y. Huang, S. A. Karamanos. Simulation of Piping Ratcheting Experiments using Advanced Plane Stress Cyclic Elastoplasticity Models (2019). International Journal of Pressure Vessels and Piping, 143, 021501-1-10 . K. Chatziioannou, S. A. Karamanos, Y. Huang. A Robust Integration Algorithm for Cyclic Plasticity-Damage Models (2020). Engineering Structures https://hdl.handle.net/1842/37517 http://dx.doi.org/10.7488/era/801 |
op_doi |
https://doi.org/10.7488/era/801 |
_version_ |
1772810721837449216 |
spelling |
ftunivedinburgh:oai:era.ed.ac.uk:1842/37517 2023-07-30T04:00:08+02:00 Experimental and numerical investigation of ratcheting and low-cycle fatigue in metal components Chatziioannou, Konstantinos Huang, Yuner Karamanos, Spyridon Lu, Yong 2020-11-30 application/pdf https://hdl.handle.net/1842/37517 https://doi.org/10.7488/era/801 en eng The University of Edinburgh K. Chatziioannou, Y. Huang, S. A. Karamanos. Dented Externally-Pressurised Pipes Subjected to Cyclic Axial Loading (2019). Proceedings of the ASME 38th International Conference on Ocean, Offshore and Arctic Engineering, pp. OMAE2019-95814. K. Chatziioannou, Y. Huang, S. A. Karamanos. Simulation of Piping Ratcheting Experiments using Advanced Plane Stress Cyclic Elastoplasticity Models (2019). Finalist in student competition, ASME 2019 Pressure Vessels and Piping Conference, pp. PVP2019-93507. K. Chatziioannou, Y. Huang, S. A. Karamanos. Coupled Numerical Simulation of Low-Cycle Fatigue under Plane Stress Conditions (2019). Invited lecturer in COMPLAS 2019, International Conference on Computational Plasticity. K. Chatziioannou, S. A. Karamanos, Y. Huang. Ultra Low-Cycle Fatigue Performance of S420 and S700 Steel Welded Tubular X-joints (2019). International Journal of Fatigue, 129, p. 105221 K. Chatziioannou, S. A. Karamanos, Y. Huang. An Implicit Numerical Scheme for Cyclic Elastoplasticity and Ratcheting under Plane Stress Conditions (2019). Computers and Structures K. Chatziioannou, Y. Huang, S. A. Karamanos. Simulation of Piping Ratcheting Experiments using Advanced Plane Stress Cyclic Elastoplasticity Models (2019). International Journal of Pressure Vessels and Piping, 143, 021501-1-10 . K. Chatziioannou, S. A. Karamanos, Y. Huang. A Robust Integration Algorithm for Cyclic Plasticity-Damage Models (2020). Engineering Structures https://hdl.handle.net/1842/37517 http://dx.doi.org/10.7488/era/801 assessing life expectancy numerical analyses experimental testing cyclic loading multi-axial material ratcheting multi-axial material ratchet simulation cyclic plasticity-damage ultra low-cycle fatigue steel welded tubular joints von-Mises yield criterion Euler-backward integration J2-flow theory isotropic continuum damage mechanics load-displacement responses Thesis or Dissertation Doctoral PhD Doctor of Philosophy 2020 ftunivedinburgh https://doi.org/10.7488/era/801 2023-07-09T20:34:44Z Structures loaded cyclically beyond their elastic limit experience gradual accumulation of plastic deformations or strains which may eventually lead to material deterioration and ductile fracture. Assessing the life expectancy of their structural members requires the development and implementation of appropriate material models into the finite element environment, using robust numerical integration schemes. It is the purpose of the present Thesis to investigate through rigorous numerical analyses and experimental testing the mechanical behaviour of metal components subjected to intense cyclic loading. Advanced numerical tools are developed to simulate multi-axial material ratcheting and cyclic plasticity-damage response in metal structural components. The ultra low-cycle fatigue of high-strength steel welded tubular joints is also investigated through large-scale experiments. An implicit numerical scheme is proposed in Chapter 2 for simulating the mechanical response of thin-walled structures subjected to inelastic cyclic loading. The constitutive model is formulated explicitly for plane stress conditions, accounts for combined kinematic/isotropic hardening and follows the von-Mises yield criterion. Emphasis is given to kinematic hardening part, which is described with an advanced multiple backstress model suitable for multi-axial material ratcheting simulation. Constitutive relations are integrated implicitly using the Euler-backward integration technique. Two main novelties of the algorithm refer to the incremental update of the internal variables through the solution of a single scalar equation, and the explicit formulation of the consistent tangent moduli. The numerical scheme is implemented into the finite element software ABAQUS (2016) as a material user-subroutine UMAT and its capabilities are demonstrated through the numerical simulation of large-scale experiments on pipe elbows, a characteristic mechanical component that experiences multi-axial ratcheting response. In the sequence, the proposed ... Doctoral or Postdoctoral Thesis Arctic Edinburgh Research Archive (ERA - University of Edinburgh) |