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Metals 2016, 6(1), 13; doi:10.3390/met6010013

The Establishment of Surface Roughness as Failure Criterion of Al–Li Alloy Stretch-Forming Process

1,2,3
,
1,2,3,* and 1,2,3
1
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China
2
State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, Hunan, China
3
2011 Collaborative Innovation Center, Central South University, Changsha 410083, Hunan, China
*
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Received: 17 December 2015 / Revised: 25 December 2015 / Accepted: 28 December 2015 / Published: 7 January 2016
(This article belongs to the Special Issue Aluminum Alloys)
View Full-Text   |   Download PDF [4874 KB, uploaded 7 January 2016]   |  

Abstract

Taking Al–Li–S4–T8 Al–Li alloy as the study object, based on the stretching and deforming characteristics of sheet metals, this paper proposes a new approach of critical orange peel state characterizations on the basis of the precise measurement of stretch-forming surface roughness and establishes the critical criterion for the occurrence of orange peel surface defects in the stretch-forming process of Al–Li alloy sheet metals. Stretching experiments of different strain paths are conducted on the specimens with different notches so as to establish the Al–Li–S4–T8 Al–Li alloy, forming limit diagram and forming limit curve equation, with the surface roughness of characteristic critical orange peel structure as the stretch-forming failure criterion. View Full-Text
Keywords: Al–Li–S4 Al–Li alloy; stretch-forming; orange peel; forming limit; surface roughness Al–Li–S4 Al–Li alloy; stretch-forming; orange peel; forming limit; surface roughness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Feng, J.-W.; Zhan, L.-H.; Yang, Y.-G. The Establishment of Surface Roughness as Failure Criterion of Al–Li Alloy Stretch-Forming Process. Metals 2016, 6, 13.

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