Surface Friction Stir Method to Improve Formability and Spring-back of AA5052-H32 Sheets

ABSTRACT A process to improve formability and spring-back was developed for AA5xxx-H temper sheets based on the surface friction stir (SFS) method. When the sheet surface is stirred by the rotating probe which advances on the surface, plastic deformation and heat resulted by friction and deformation...

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Bibliographic Details
Published in:International journal of material forming 2008-04, Vol.1 (Suppl 1), p.261-264
Main Authors: Park, Sangjoon, Lee, Chang Gil, Han, Heung Nam, Ma, Ning, Chung, Kwansoo
Format: Article
Language:English
Subjects:
CAE) and Design
Computational Intelligence
Computer-Aided Engineering (CAD
Engineering
Machines
Manufacturing
Materials Science
Mechanical Engineering
Processes
Symposium MS04: Anisotropy and formability
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Summary:ABSTRACT A process to improve formability and spring-back was developed for AA5xxx-H temper sheets based on the surface friction stir (SFS) method. When the sheet surface is stirred by the rotating probe which advances on the surface, plastic deformation and heat resulted by friction and deformation incur changes in the microstructure and macroscopic mechanical properties of the stirred zone and, therefore, ultimately the formability and spring-back performance of the overall sheet. When applied to AA5052-H32 automotive sheets, the process improved formability and spring-back, as experimentally and numerically confirmed in uni-axial tensile, limit dome height (LDH) and unconstrained bending tests. For numerical simulations, the non-quadratic anisotropic yield function, Yld2000–2d, was employed along with isotropic hardening, while formability was evaluated using theoretical forming limit diagram (FLD) based on Hill’s bifurcation and M-K theories.
ISSN:1960-6206
1960-6214
DOI:10.1007/s12289-008-0354-z