Identification of forming limit curve at fracture in incremental sheet forming

• Published in: International journal of advanced manufacturing technology Vol. 92; no. 9-12; pp. 4445 - 4455
• Main Authors: Do, Van-Cuong, Pham, Quoc-Tuan, Kim, Young-Suk
• Format: Journal Article
• Language: English
• Published: London Springer London 01.10.2017; Springer Nature B.V
• Subjects: CAE) and Design; CAM; Computer aided manufacturing; Computer simulation; Computer-Aided Engineering (CAD; Engineering; Finite element method; Forming limit diagrams; Forming techniques; Industrial and Production Engineering; Mathematical models; Mechanical Engineering; Media Management; Original Article; Plane strain; Press forming; Incremental sheet forming (ISF); Equi-biaxial strain; Non-associated flow rule; Forming limit curve at fracture; Finite element simulation
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-017-0441-8

Computer-aided manufacturing technology is widely used in the sheet-forming industry to predict forming performance. Strain-based forming limit criterion is popularly used for this purpose. In incremental sheet forming, the forming limit curve at fracture (FLCF) is a line from the equi-biaxial strain-point to plane strain-point and is high in comparison with those in conventional press forming methods. This study aims to empirically define the FLCF, specifically the equi-biaxial strain at fracture which has yet to be experimentally defined. In addition, to confirm the experimental measurement results, the finite element simulation by ABAQUS/Explicit was performed wherein the fitted flow curve of the large-strain range, accompanied with non-associated flow rule yield behaviour, demonstrates good agreement with the experiment. A new stress-strain equation is thus introduced to describe the flow curve in a large-strain range.