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Numerical Modelling and Experimental Investigation of Hot Rolled Steels Open Access


Other title
Finite Element Simulation
Hot Rolled Steels
Micromechanical Model
Type of item
Degree grantor
University of Alberta
Author or creator
Niu, Ke
Supervisor and department
Chen, Zengtao (Mechanical Engineering)
Examining committee member and department
Tian, Zhigang (Mechanical Engineering)
Xia, Zihui (Mechanical Engineering)
Ma, Yongsheng (Mechanical Engineering)
Department of Mechanical Engineering

Date accepted
Graduation date
Master of Science
Degree level
Hot rolled steels are steel alloys manufactured through a very efficient direct rolling process following solidification above the recrystallization temperature. Hot rolled steels have a unique microstructure with relatively high contents of bainite and martensite phases continuously dispersed in a ferrite matrix. Hot rolled steels exhibit superior strength and moderate ductility. They are considered as a group of advanced high strength steels with very promising potential application in the automotive industry. Interest of these materials has seen a great increase in recent years. In the present work, deformation behaviors of hot-rolled, stretch flangeable steels have been investigated. Tensile tests of circularly notched steel samples of different notch geometries are conducted to mimic the deformation condition during stretch flanging. A digital image correlation system is employed to record local strain distribution during the tensile test, while finite element simulations of notched tensile tests are performed to examine the stress state variation within the notched region. The stress-strain relations are derived from load-displacement history of tensile tests and digital image correlation analysis. Multi-particle unit cell models were built to simulate the effect of the distribution of bainite/martensite phases on the deformation behavior of hot rolled steels. The actual stress states experienced within the notched region were extracted from the finite element results and applied directly to the micromechanical models.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
Citation for previous publication
Chapter 5, section 5.1 and 5.2 of this thesis have been published as K .Niu, A. Abedini, and Z.T. Chen, " The Influence of Multiple Inclusion on the Cauchy Stress of a Spherical Particle-reinforced Composite under Uniaxial Loading," ASME 2014 International Mechanical Engineering Congress&Exposition (IMECE), Montreal, Canada

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