naa a22 4500 510772684 CHVBK 20180411083219.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s11837-013-0709-x doi (NATIONALLICENCE)springer-10.1007/s11837-013-0709-x Numerical Modeling of Frictional Stress in the Contact Zone of Direct Extrusion of Aluminum Alloys under Starved Lubrication [Elektronische Daten] [P. Tomar, R. Pandey, Y. Nath] The objective of this article is to investigate numerically frictional stress in the contact zone at the die/billet interface in the direct extrusion of aluminum alloys considering starved lubricated conditions. In the modeling, both the inlet and work zones have been investigated by coupled solution of the governing equations. The influences of the billet material's strain hardening and its heating due to the plastic deformation are accounted for in the numerical computation. The frictional shear stress at the die/billet interface is computed using three different lubricating oils. Numerical results have been presented herein for the various operating parameters viz. starvation factor (ψ=0.2-0.6), lubricants' viscosities (η 0=0.05Pas-0.2Pas), semi die angle (β=10°-20°), and material parameter (G=0.56-2.25). It has been observed that the frictional stress increases with an increase in the severity of the lubricant's starvation for the given values of semi-die angle, extrusion speed, and material parameter. TMS, 2013 Tomar P. MAE Department (I.G.I.T), Guru Gobind Singh Indraprashta University, 110403, New Delhi, India aut Pandey R. Department of Mechanical Engineering, IIT Delhi, 110016, New Delhi, India aut Nath Y. Department of Applied Mechanics, IIT Delhi, 110016, New Delhi, India aut JOM Springer US; http://www.springer-ny.com 65/11(2013-11-01), 1426-1432 1047-4838 65:11<1426 2013 65 11837 https://doi.org/10.1007/s11837-013-0709-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0709-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tomar P. MAE Department (I.G.I.T), Guru Gobind Singh Indraprashta University, 110403, New Delhi, India aut NATIONALLICENCE 700 1- Pandey R. Department of Mechanical Engineering, IIT Delhi, 110016, New Delhi, India aut NATIONALLICENCE 700 1- Nath Y. Department of Applied Mechanics, IIT Delhi, 110016, New Delhi, India aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/11(2013-11-01), 1426-1432 1047-4838 65:11<1426 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer