Evaluation of deformation stability and fracture mechanism in incremental sheet forming

Ai, S.; Lu, B.; Chen, J.; Long, H.; Ou, Hengan

Abstract

Incremental sheet forming (ISF) is a flexible process for rapid manufacturing of complex sheet metal parts. An advantage of ISF is the improved formability than traditional sheet forming processes such as stamping. A number of fundamental studies have been conducted to investigate the enhanced ISF formability considering the effects such as bending under tension and through thickness shear. To further understand the ISF deformation mechanism and formability enhancement, this work presents a new analytical model which is focused on investigating the deformation stability and its effect on the metal sheet fracture. Based on this new model, the critical strain of deformation instability is obtained. Furthermore, influences of the work-hardening effect and bending effect on the deformation stability are investigated. To validate the analytical model, the fracture occurrence of two aluminum grades, AA1100 and AA5052, are investigated by using ISF experiment. Based on the analytical and experimental investigation, this study has concluded that bending plays a major role on ISF deformation stability. In addition, the ISF fracture depends on both deformation stability and the sheet material's ductility.

Citation

Ai, S., Lu, B., Chen, J., Long, H., & Ou, H. (2017). Evaluation of deformation stability and fracture mechanism in incremental sheet forming. International Journal of Mechanical Sciences, 124-125, https://doi.org/10.1016/j.ijmecsci.2017.03.012

• Journal Article Type: Article
• Acceptance Date: Mar 8, 2017
• Online Publication Date: Mar 10, 2017
• Publication Date: May 1, 2017
• Deposit Date: May 16, 2017
• Publicly Available Date: May 16, 2017
• Journal: International Journal of Mechanical Sciences
• Print ISSN: 0020-7403
• Electronic ISSN: 0020-7403
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 124-125
• DOI: https://doi.org/10.1016/j.ijmecsci.2017.03.012
• Keywords: Incremental sheet forming; Deformation instability; Formability; Fracture
• Public URL: https://nottingham-repository.worktribe.com/output/968970
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0020740316310657