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Failure and strain gradient analyses in incremental forming using GTN model

Ilyas, Muhammad and Hussain, Ghulam and Espinosa, Christine Failure and strain gradient analyses in incremental forming using GTN model. (2019) International Journal of Lightweight Materials and Manufacture, 2 (2). 177-185. ISSN 2588-8404

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Official URL: https://doi.org/10.1016/j.ijlmm.2018.12.002

Abstract

Single point incremental forming (SPIF) process is gaining popularity for rapid manufacturing of complex 3D shapes. The present study is aimed at numerically predicting the failure using the Gurson-Tvergaard-Needleman (GTN) model and further clarifying the deformation mechanics in SPIF. Deformation mechanics and failure in SPIF process are examined numerically by simulating a straight groove test. Solid finite element (FE) models have been employed to investigate deformation modes. The GTN damage model has successfully predicted forming limits in the straight groove test. It is shown that failure, regardless of the incremental sheet forming (ISF) conditions, occurs when the damage parameter (d) approaches one. Furthermore, effective plastic strain, hydrostatic pressure, vertical tool force and through thickness strain gradient increase with an increase in step size. Finally, it is shown that an increase in hydrostatic pressure and increase in through thickness strain gradient enhance formability.

Item Type:Article
HAL Id:hal-02191258
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Other partners > Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (PAKISTAN)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
GIK Institute of Engineering Sciences and Technology
Statistics:download
Deposited By: ESPINOSA Christine
Deposited On:02 Apr 2019 14:45

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