Crystal plasticity finite element method simulation of equal channel angular pressing

273 Pages·2017·12.11 MB·English

UUnniivveerrssiittyy ooff WWoolllloonnggoonngg
RReesseeaarrcchh OOnnlliinnee
University of Wollongong Thesis Collection
University of Wollongong Thesis Collections
1954-2016
2014
CCrryyssttaall ppllaassttiicciittyy fifinniittee eelleemmeenntt mmeetthhoodd ssiimmuullaattiioonn ooff eeqquuaall cchhaannnneell aanngguullaarr
pprreessssiinngg
Guanyu Deng
University of Wollongong
Follow this and additional works at: https://ro.uow.edu.au/theses
UUnniivveerrssiittyy ooff WWoolllloonnggoonngg
CCooppyyrriigghhtt WWaarrnniinngg
You may print or download ONE copy of this document for the purpose of your own research or study. The University
does not authorise you to copy, communicate or otherwise make available electronically to any other person any
copyright material contained on this site.
You are reminded of the following: This work is copyright. Apart from any use permitted under the Copyright Act
1968, no part of this work may be reproduced by any process, nor may any other exclusive right be exercised,
without the permission of the author. Copyright owners are entitled to take legal action against persons who infringe
their copyright. A reproduction of material that is protected by copyright may be a copyright infringement. A court
may impose penalties and award damages in relation to offences and infringements relating to copyright material.
Higher penalties may apply, and higher damages may be awarded, for offences and infringements involving the
conversion of material into digital or electronic form.
UUnnlleessss ootthheerrwwiissee iinnddiiccaatteedd,, tthhee vviieewwss eexxpprreesssseedd iinn tthhiiss tthheessiiss aarree tthhoossee ooff tthhee aauutthhoorr aanndd ddoo nnoott nneecceessssaarriillyy
rreepprreesseenntt tthhee vviieewwss ooff tthhee UUnniivveerrssiittyy ooff WWoolllloonnggoonngg..
RReeccoommmmeennddeedd CCiittaattiioonn
Deng, Guanyu, Crystal plasticity finite element method simulation of equal channel angular pressing,
Doctor of Philosophy thesis, School of Mechanical, Materials and Mechatronic Engineering, University of
Wollongong, 2014. https://ro.uow.edu.au/theses/4128
Research Online is the open access institutional repository for the University of Wollongong. For further information
contact the UOW Library: [email protected]
Crystal Plasticity Finite Element Method
Simulation of Equal Channel Angular Pressing

A thesis submitted in fulfilment of the requirements
for the award of the degree of

Doctor of Philosophy

from
University of Wollongong

by
Guanyu Deng
BEng, MEng

School of Mechanical, Materials and Mechatronic Engineering
Faculty of Engineering
2014

Declaration

I, Guanyu Deng, declare that this thesis, submitted in fulfillment of the requirements for the
award of Doctor of Philosophy, in the school of Mechanical, Materials and Mechatronic
Engineering, University of Wollongong, Australia, is wholly my own work unless otherwise
referenced or acknowledged, and has not been submitted for qualifications at any other
university or academic institution.

Guanyu Deng
August 2014

I

Acknowledgements
I wish to express my sincere gratitude to my supervisors Professor Anh Kiet Tieu (University of
Wollongong), Associate/Professor Cheng Lu (University of Wollongong) and Professor Xianghua
Liu (Northeastern University, China) for their excellent supervision and guidance, continuous
encouragement and invaluable advice during my PhD study. All my supervisors’ implicit trust in
my research abilities not only allowed me to freely pursue my goals, but also gave me an
opportunity to learn how to manage time and allocate resources. Without their help I could
never have finished this work.
I am grateful to Dr. Hongtao Zhu, Dr. Zhijie Jiao, Dr. Liangying Si and Dr. Nam Nhat Huynh for
their invaluable advice on my study. I would also like to acknowledge all colleagues in Prof.
Tieu’s group. We shared our feelings, comfort and support for each other and I liked the
discussions with you all during our weekly group meetings, as well as the basketball games.
My thanks are also extended to Bei Wang, Zhe Sun, Jinlin Li, Ziqi Sun, Ting Liao and Jintao Li for
your great help and support and I will never forget the time spent together with you guys. I
acknowledge my office roommates, EEC and ITS staffs for their kind help.
Special thanks go to Laia Ledo Gomis, Wan Fathul Hakim W. Zamri and Ahmed Saleh for your
great help, fruitful discussions and continuous encouragement. I enjoyed all the coffees,
dinners, movies and trips together with you and I feel very lucky to have you guys during my
study in Wollongong.
Finally, I would like to offer my heartfelt thanks to my family, for their continued love,
understanding and devotion. Their encouragements always kept me going forward during my
study.
Thank you all,

Guanyu
II

List of Publications
1. G.Y. Deng, C. Lu, L.H. Su, X.H. Liu, A.K. Tieu, Modeling texture evolution during ECAP of
copper single crystal by crystal plasticity FEM, Materials Science and Engineering A, 534 (2012)
68-74.
2. G.Y. Deng, C. Lu, L.H. Su, A.K. Tieu, X.H. Liu, Crystal plasticity investigation of texture
evolution of Al single crystal during extrusion through a bent channel, Journal of Computational
and Theoretical Nanoscience, 9 (2012) 1481-1484.
3. G.Y. Deng, C. Lu, L.H. Su, A.K. Tieu, H.L. Yu, X.H. Liu, Investigation of sample size effect on the
deformation heterogeneity and texture development during equal channel angular pressing,
Computational Materials Science, 74 (2013) 75-85.
4. G.Y. Deng, C. Lu, L.H. Su, A.K. Tieu, M. Liu, H.T. Zhu, X.H. Liu, Influence of outer corner angle
(OCA) on the deformation behavior and texture evolution in equal channel angular pressing,
Computational Materials Science, in press, doi: 10.1016/j.commatsci.2013.07.006.
5. G.Y. Deng, C. Lu, L.H. Su, J.T. Li, H.T. Zhu, X.H. Liu, A.K. Tieu, A study on the aluminium alloy
AA1050 severely deformed by Non-equal channel angular pressing, Advanced Materials
Research, 651 (2013) 442-447.
6. G.Y. Deng, A.K. Tieu, L.H. Su, C. Lu, H.T. Zhu, P.T. Wei, X.H. Liu, Crystal plasticity FEM study on
the influence of crystallographic orientation in copper single crystals subjected to equal channel
angular pressing, Steel Research International, in press, doi: 10.1002/srin.201300047.
7. G.Y. Deng, A.K. Tieu, L.Y. Si, L.H. Su, C. Lu, H.T. Zhu, H. Wang, M. Liu and X.H. Liu, Influence of
cold rolling reduction on the deformation behavior and crystallographic orientation
development, Computational Materials Science, in press, doi:10.1016/j.commatsci.2013.06.054.
III
8. G.Y. Deng, C. Lu, L.H. Su, A.K. Tieu, H.L. Yu, L.Y. Si, H.T. Zhu, X.H. Liu, Crystal plasticity finite
element analysis of influence of initial crystal orientation on texture evolution of cold rolled
aluminium, Steel Research International, special edition: Metal Forming 2012, 1119-1122.
9. C. Lu, G.Y. Deng, A.K. Tieu, L.H. Su, H.T. Zhu, X.H. Liu, Crystal plasticity modeling of texture
evolution and heterogeneity in equal channel angular pressing of aluminium single crystal, Acta
Materialia, 59 (2011) 3581-3592.
10. A.K. Tieu, G.Y. Deng, C. Lu, L.H. Su, H.T. Zhu, M. Liu, X.H. Liu, An insight into the deformation
and orientation development of severely plastic deformed aluminium, AIP Conference
Proceedings, 1532 (2013) 206-213.
IV
Abstract

List of Contents
Declaration ............................................................................................................................ I
Acknowledgements ............................................................................................................... II
List of Publications ............................................................................................................... III
List of Contents ...................................................................................................................... i
Abstract ............................................................................................................................... iv
Notations ............................................................................................................................ vii
List of Tables ........................................................................................................................xii
List of Figures ...................................................................................................................... xiv
Chapter 1 Introduction .......................................................................................................... 1
Chapter 2 Literature Review .................................................................................................. 4
2.1 Severe Plastic Deformation ................................................................................................... 4
2.2 ECAP .................................................................................................................................... 11
2.3 Deformation Models of the ECAP Process .......................................................................... 16
2.3.1 Simple Shear Model.................................................................................................... 16
2.3.2 Analytical Model ......................................................................................................... 16
2.3.3 Physical Model ............................................................................................................ 19
2.3.4 Classic Finite Element Method Model ........................................................................ 19
2.4 ECAP Texture Measurement ............................................................................................... 21
2.4.1 Texture Representation and Measurement Techniques ........................................... 21
2.4.2 Main Characteristics of Measured ECAP Texture ....................................................... 23
2.5 ECAP Texture Simulations ................................................................................................... 27
2.5.1 Taylor-type Models .................................................................................................... 27
2.5.2 Self-consistent Model ................................................................................................. 32
2.5.3 CPFEM Model ............................................................................................................. 36
i