In the production of semi-finished metal products, hot forming is used to eliminate the pores and voids from the casting process under compressive stresses and to modify the microstructure for further processing. In the case of caliber and flat rolling processes, tensile stresses occur at certain roll gap ratios which promote pore formation on nonmetallic inclusion. The formation of new pores contributes to ductile damage and reduces the load carrying capacity of the material. In the literature, the damage nucleation and growth during the hot forming process are not comprehensively described. The aim of this study is to understand the damage initiation and growth mechanism during hot forming processes. Hot tensile tests are performed at different temperatures and strain rates for 16MnCrS5 steel. To investigate the influence of geometrical variations on the damage mechanism, specimens with different stress triaxiality ratios are used. Finite element simulations using the Gurson-Tvergaard-Needleman (GTN) damage model are performed to estimate the critical void fraction for the damage initiation and the evolution of the void volume fraction. The results showed that the GTN model underestimates the softening of the material due to the independence of the temperature and the strain rate.
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2 May 2018
PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018
23–25 April 2018
Palermo, Italy
Research Article|
May 02 2018
Towards the damage evaluation using Gurson-Tvergaard-Needleman (GTN) model for hot forming processes Available to Purchase
Muhammad Imran;
Muhammad Imran
a)
1
Chair of Mechanical Design and Manufacturing, Brandenburg University of Technology Cottbus – Senftenburg
, Konrad – Wachsmann –Allee 17, D-03046 Cottbus, Germany
a)Corresponding author: [email protected]
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Markus Bambach
Markus Bambach
b)
1
Chair of Mechanical Design and Manufacturing, Brandenburg University of Technology Cottbus – Senftenburg
, Konrad – Wachsmann –Allee 17, D-03046 Cottbus, Germany
Search for other works by this author on:
Muhammad Imran
1,a)
Markus Bambach
1,b)
1
Chair of Mechanical Design and Manufacturing, Brandenburg University of Technology Cottbus – Senftenburg
, Konrad – Wachsmann –Allee 17, D-03046 Cottbus, Germany
a)Corresponding author: [email protected]
AIP Conf. Proc. 1960, 170006 (2018)
Citation
Muhammad Imran, Markus Bambach; Towards the damage evaluation using Gurson-Tvergaard-Needleman (GTN) model for hot forming processes. AIP Conf. Proc. 2 May 2018; 1960 (1): 170006. https://doi.org/10.1063/1.5035063
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