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research-article

Characterization of plastic anisotropy of AA5182-O sheets during pre-straining and subsequent annealing

[+] Author and Article Information
Kaifeng Wang

Department of Industrial and Manufacturing Engineering, Pennsylvania State University, University Park, PA 16802, USA
kuw209@psu.edu

Bonan Zhou

Department of Mechanical Engineering, University of Hawaii, Honolulu, HI 96822, USA
zhou9891@gmail.com

Jingjing Li

Department of Industrial and Manufacturing Engineering, Pennsylvania State University, University Park, PA 16802, USA
jul572@engr.psu.edu

J. E. Carsley

General Motors Global Research and Development Center, Warren, MI 48092, USA
john.carsley@gm.com

Yang Li

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
umliyang@umich.edu

1Corresponding author.

ASME doi:10.1115/1.4040157 History: Received January 29, 2018; Revised May 01, 2018

Abstract

This paper described the effects of pre-straining and annealing on plastic anisotropy (r-value) of aluminum alloy 5182-O sheets including two pre-strain paths and two annealing conditions. During the pre-straining and annealing processes, r-value changed depending on pre-strain paths and annealing conditions. Although there were slight changes of the normal anisotropy coefficient, r ¯, during pre-straining and annealing processes, the planar anisotropy coefficient, ?r, increased significantly, especially for the uniaxial pre-strain condition. This could accelerate the development of earing during a sheet forming operation. Also, the corresponding sheet textures in RD/TD plane after pre-straining and annealing processes were observed through electron backscatter diffraction analysis to explain the r-value changes, where the viscoplastic self-consistent model was used to correlate the determined texture to measured r-values. It is found that the sheet texture also had significant changes relating to the pre-strain paths and annealing conditions resulting in varied r-values.

Copyright (c) 2018 by ASME
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