Formability analysis of electrically assisted double-side multi-point incremental sheet forming

Double-side multi-point incremental forming (DMISF) process combines local and progressive forming features with the advantages such as high forming precision, high production flexibility, and high fracture limit, so it is suitable to form complex aerospace parts and difficult-to-shape materials. Hi...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2020-06, Vol.108 (11-12), p.3405-3417
Main Authors: Gao, Leitao, Zhao, Yixi, Yu, Zhongqi, Yan, Hui
Format: Article
Language:English
Subjects:
Aluminum
Aluminum alloys
Aluminum base alloys
Axial stress
CAE) and Design
Characteristic functions
Computer-Aided Engineering (CAD
Criteria
Ductile fracture
Electric fields
Engineering
Formability
Forming techniques
High strength alloys
Industrial and Production Engineering
Mechanical Engineering
Media Management
Original Article
Room temperature
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Summary:Double-side multi-point incremental forming (DMISF) process combines local and progressive forming features with the advantages such as high forming precision, high production flexibility, and high fracture limit, so it is suitable to form complex aerospace parts and difficult-to-shape materials. High-strength aluminum alloy is widely used in aerospace fields, but its poor formability at room temperature limits its further development. Pulse current was introduced into DMISF process to improve the formability of high-strength aluminum alloy. So equipment for electrically assisted double-side multi-point incremental sheet forming (E-DMISF) process was set up. However, the E-DMISF process is a complicated electro-thermal-structure multi-field coupling process; the flow of the material in the forming process is very complicated. In this research, the hyperbolic truncated cone and hyperbolic truncated pyramid were chosen as study objects and the stress triaxiality was selected as the characteristic function of ductile fracture criterion. Based on all above, the fracture limit experiments and simulation in the E-DMISF process were performed and the fracture criterion was established correspondingly. The result indicates that the electric field could help enhance the fracture limit effectively.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-020-05576-4