Schmid S.R.,University of Notre Dame |
Liu J.,University of Notre Dame |
Liu J.,Doris Inc. |
Selles M.A.,Polytechnic University of Valencia |
Pasang T.,University of Auckland
Computational Materials Science | Year: 2013
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. © 2013 Elsevier B.V. All rights reserved. Source
Doris Inc. | Date: 2012-02-10
Doris Inc. and Doris Hosiery Mills Ltd. | Date: 2013-02-08
Doris Inc. | Date: 2013-05-23
Clothing, namely, leggings, hosiery, lingerie, underwear, undergarments, exercise wear in the nature of exercise tops and exercise bottoms, and loungewear.
8911126 Canada Inc., Doris Inc. and and Technology Inc. | Date: 2012-05-15
Clothing, namely, tops and bottoms, intimate apparel in the nature of undergarments, underwear, lingerie; activewear, namely, tops and bottoms; casual wear, namely, tops and bottoms; hosiery.