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

Bonan Zhou

Department of Mechanical Engineering, University of Hawaii, Honolulu, HI 96822, USA

Jingjing Li

Department of Industrial and Manufacturing Engineering, Pennsylvania State University, University Park, PA 16802, USA

J. E. Carsley

General Motors Global Research and Development Center, Warren, MI 48092, USA

Yang Li

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA

1Corresponding author.

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


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.

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