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Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model

Gatea, Shakir; Lu, Bin; Chen, Jun; Ou, Hengan; McCartney, Graham

Authors

Shakir Gatea

Bin Lu

Jun Chen

Graham McCartney



Abstract

The incremental sheet forming (ISF) process is considered as a feasible solution for forming a variety of small batch and even customised sheet components. The quality of an ISF product is affected by various process parameters, e.g. sheet material, step-down, feed rate, tool diameter and lubricant. To produce an ISF part of sufficient quality and accuracy without defects, optimal parameters of the ISF process should be selected. In the present work, experiments and FE analyses were conducted to evaluate the influence of the main ISF process parameters including the step-down, feed rate and tool diameter on the formability and fracture of two types of pure Ti (grade 1 and 2). The Gurson–Tvergaard-Needleman (GTN) damage constitutive model with consideration of stress triaxiality was developed to predict ductile fracture in the ISF process due to void nucleation, growth and coalescence. It was found that the ISF parameters have varying degrees of effect on the formability and fracture occurrence of the two types of pure Ti, and grade 2 pure Ti sheet is more sensitive than grade 1 Ti sheet to the forming parameters due to low ductility.

Citation

Gatea, S., Lu, B., Chen, J., Ou, H., & McCartney, G. (2019). Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model. International Journal of Material Forming, 12(4), 553–574. doi:10.1007/s12289-018-1434-3

Journal Article Type Article
Acceptance Date Jul 20, 2018
Online Publication Date Jul 30, 2018
Publication Date 2019-07
Deposit Date Jul 23, 2018
Journal International Journal of Material Forming
Print ISSN 1960-6206
Electronic ISSN 1960-6214
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 12
Issue 4
Pages 553–574
DOI https://doi.org/10.1007/s12289-018-1434-3
Keywords ISF; Forming parameters; Formability; Fracture; Stress triaxiality; GTN model
Public URL http://eprints.nottingham.ac.uk/id/eprint/53089
Publisher URL https://link.springer.com/article/10.1007/s12289-018-1434-3
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf