Modeling of Die‐Workpiece Interface during Hot Forging

Kannan, K.; Pandheeradi, Murali; Vaze, Suhas; Schmid, Steven R.; Wilson, W. R. D.

doi:10.1002/9781118788103.ch16

Cited by 2 publications

(2 citation statements)

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“…3 and 4 are similar because the friction factor in Fig. 3 was selected to reproduce the experiments of Kannan, et al [26]. Tribology and heat transfer model inputs such as the friction factor for direct asperity-to-asperity contacts and lubricant properties were defined from these experiments.…”

Section: Resultsmentioning

confidence: 99%

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Advanced interface models for metal forming simulations

Schmid

Liu

Sanchez-Caballero

et al. 2013

Computational Materials Science

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Friction and heat transfer in metal forming simulations are usually restricted by software to be interface constants, a situation not reflected by the mechanics of real manufacturing processes. A better simulation approach is to use a micromechanics based method to estimate friction and heat transfer as evolutionary phenomenon. This paper presents a friction and heat transfer module for hot forging simulations. The friction model is based on a lubricant film thickness calculation using the Reynolds equation, and a calculation of the fractional contact area based on asperity flattening and roughening. Friction is then portioned between asperity and lubricant contacts. Heat transfer coefficients are calculated using a new model for heat conduction through asperity contact patches and lubricant that takes into account the restriction to heat flow at the contacts. The program is implemented as a user routine in a popular commercially available finite element code, DEFORM 2D.

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Section: Resultsmentioning

confidence: 99%

“…The lubricant used has been a glass, which is taken as a liquid whose viscosity depends on temperature only. Based on measurements conducted by Kannan et al [26], the viscosity of the glass is taken as 0.675 Pas, and the thermal conductivity for it is 1.4 W/m2K [27].…”

mentioning

confidence: 99%