G. Banaszek and A. Stefanik, Theoretical and laboratory modelling of the closure of metallurgical defects during forming of a forging, Journal of Materials Processing Technology, vol.177, issue.1-3, p.238242, 2006.

J. Chen, K. Chandrashekhara, C. Mahimkar, S. N. Lekakh, and V. L. Richards, Study of void closure in hot radial forging process using 3D nonlinear nite element analysis, The International Journal of Advanced Manufacturing Technology, vol.62, p.10011011, 2012.

S. P. Dudra and Y. Im, Analysis of void closure in open-die forging, International Journal of Machine Tools and Manufacture, vol.30, issue.1, 1990.
DOI : 10.1016/0890-6955(90)90042-h

J. M. Duva and J. W. Hutchinson, Constitutive potentials for dilutely voided nonlinear materials, Mechanics of Materials, vol.3, issue.1, 1984.
DOI : 10.1016/0167-6636(84)90013-9

M. Y. He and J. W. Hutchinson, The penny-shaped crack and the plane strain crack in an innite body of power-law material, Journal of Applied Mechanics, vol.48, 1981.

H. Kakimoto, T. Arikawa, Y. Takahashi, T. Tanaka, and Y. Imaida, Development of forging process design to close internal voids, Journal of Materials Processing Technology, vol.210, issue.3, p.415422, 2010.
DOI : 10.1016/j.jmatprotec.2009.09.022

B. J. Lee and M. E. Mear, Studies of the growth and collapse of voids in viscous solids, Journal of Engineering Materials and Technology, vol.116, issue.3, 1994.

M. Nakasaki, I. Takasu, and H. Utsunomiya, Application of hydrostatic integration parameter for free-forging and rolling, Journal of Materials Processing Technology, vol.177, issue.1-3, 2006.
DOI : 10.1016/j.jmatprotec.2006.04.102

H. Överstam and M. Jarl, Fem-simulation of drawing out in open die forging, Steel Research International, vol.75, issue.12, 2004.

C. Y. Park and D. Y. Yang, A study of void crushing in large forgings I: Bonding mechanism and estimation model for bonding eciency, Journal of Materials Processing Technology, vol.57, issue.1-2, p.129140, 1996.

M. Pietrzyk, R. Kawalla, and H. Pircher, Simulation of the behaviour of voids in steel plates during hot rolling, Steel Research, vol.66, issue.12, 1995.

A. R. Ragab, Application of an extended void growth model with strain hardening and void shape evolution to ductile fracture under axisymmetric tension, Engineering Fracture Mechanics, vol.71, issue.11, 2004.
DOI : 10.1016/s0013-7944(03)00216-9

M. Saby, Understanding and modeling of void closure mechanisms in hot metal forming processes, 2013.
DOI : 10.1016/j.proeng.2014.09.140
URL : https://hal.archives-ouvertes.fr/hal-01110919

M. Saby, M. Bernacki, E. Roux, and P. Bouchard, Three-dimensional analysis of real void closure at the meso-scale during hot metal forming processes, Computational Materials Science, vol.77, 2013.
DOI : 10.1016/j.commatsci.2013.05.002
URL : https://hal.archives-ouvertes.fr/hal-00831553

U. Ståhlberg, Inuence of spread and stress on the closure of a central longitudinal hole in the hot rolling of steel, Journal of Mechanical Working Technology, vol.13, issue.1, 1986.

U. Ståhlberg and H. Keife, A study of hole closure in hot rolling as inuenced by forced cooling, Journal of Materials Processing Technology, vol.30, issue.1, pp.131-135, 1992.

U. Ståhlberg, H. Keife, M. Lundberg, and A. Melander, A study of void closure during plastic deformation, Journal of Mechanical Working Technology, vol.4, issue.1, 1980.

M. Tanaka, S. Ono, and M. Tsuneno, Factors contributing to crushing of voids during forging, Journal of JSTP, vol.27, issue.306, p.927934, 1986.

A. Tomlison, A. Met, and J. Dstringer, La suppression des cavites internes dans les pieces de forge par refoulement, Journal of the Iron and Steel Institute, 1958.

A. Wallerö, Closing of a central longitudinal pore in hot rolling, Journal of Mechanical Working Technology, vol.12, issue.2, 1985.

X. Zhang and Z. Cui, Theoretical study of void closure in nonlinear plastic materials, Applied Mathematics and Mechanics-english Edition, vol.30, issue.5, p.631642, 2009.

X. Zhang, Z. Cui, W. Chen, and Y. Li, A criterion for void closure in large ingots during hot forging, Journal of Materials Processing Technology, vol.209, issue.4, 2009.