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

Gatea, Shakir and Lu, Bin and Chen, Jun and Ou, Hengan and McCartney, Graham (2018) Investigation of the effect of forming parameters in incremental sheet forming using a micromechanics based damage model. International Journal of Material Forming . ISSN 1960-6214

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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.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/947408
Keywords: ISF; Forming parameters; Formability; Fracture; Stress triaxiality; GTN model
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: https://doi.org/10.1007/s12289-018-1434-3
Depositing User: Eprints, Support
Date Deposited: 23 Jul 2018 12:21
Last Modified: 04 May 2020 19:47
URI: http://eprints.nottingham.ac.uk/id/eprint/53089

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