Experimental identification of uncoupled ductile damage models and application in flow forming of IN718

Experimental identification of uncoupled ductile damage models and application in flow forming of IN718

VURAL Hande, ERDOGAN Can, KARAKAŞ Aptullah, FENERCIOGLU Tevfik Ozan, YALÇINKAYA Tuncay

Abstract. The aim of this study is to calibrate the parameters of the Johnson-Cook (JC) and modified Mohr-Coulomb (MMC) ductile failure models for Inconel 718 and predict the formability limit in the flow forming process using the aforementioned uncoupled damage models. Uniaxial tensile tests are performed on four different specimen geometries to cover a variety of stress states. A hybrid methodology combining finite element simulations and experimental findings is used to calibrate the JC and MMC damage models. The models are implemented in the finite element solver Abaqus using a user-defined subroutine. Results show that the calibrated models agree well with the experimental data in all tensile tests. In shear dominant loads, the MMC model is found to be more capable of showing accurate crack propagation. In flow forming simulations, a significant difference is observed between the JC and MMC models in the prediction of damage. Lode parameter-dependent damage models, such as the MMC, are found to be more suitable for the prediction forming limits in the flow forming process.

Keywords
Ductile Fracture, Fracture Locus, Flow Forming Process

Published online 4/19/2023, 10 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: VURAL Hande, ERDOGAN Can, KARAKAŞ Aptullah, FENERCIOGLU Tevfik Ozan, YALÇINKAYA Tuncay, Experimental identification of uncoupled ductile damage models and application in flow forming of IN718, Materials Research Proceedings, Vol. 28, pp 807-816, 2023

DOI: https://doi.org/10.21741/9781644902479-88

The article was published as article 88 of the book Material Forming

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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