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

Metals

Jing-Wen Feng¹  Li-Hua Zhan¹  Ying-Ge Yang¹ 

[1] School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan, China;

关键词: Al–Li–S4 Al–Li alloy;    stretch-forming;    orange peel;    forming limit;    surface roughness;   

DOI  :  10.3390/met6010013

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.