[1]  Zhang Q, Felder E, Bruschi S (2009) Evaluation of friction condition in cold forging by using T-shape compression test. J Mater Process Tech 209: 5720-5729.

[2]  Wang L, Zhou J, Duszczyk J, Katgerman L (2012) Friction in aluminium extrusion—Part 1: A review of friction testing techniques for aluminium extrusion. Tribol Int 56: 89-98.

[3]  Kunogi M (1956) A new method of cold extrusion. J Sci Res Ins 50: 215-245.

[4]  Male A (1964) A method for the determination of the coefficient of friction of metals under conditions of bulk plastic deformation. J Ins Metals 65: 38-43.

[5] Shen G, Vedhanayagam A, Kropp E, Altan T (1992) A method for evaluating friction using a backward extrusion-type forging. J Mater Process Tech 33:109-123.

[6]  Buschhausen WK, Lee A, Altan T. (1992) Evaluation of lubrication and friction in cold forging using a double backward-extrusion process. J Mater Process Tech  33(1-2): 95-108.

 [7] Wang YHL, Zhang Y, Cai J, Zhou J, Duszczyk J, Katgerman L (2010) Modeling of double action extrusion — A novel extrusion process for friction characterization at the billet – die bearing interface. Tribol Int 43: 2084-2091.

[8]  Kang SH, Lee KS, Lee YS (2011) Evaluation of interfacial friction condition by boss and rib test based on backward extrusion. Int J Mech Sci  53: 59-64.

[9]  Sofuoglu HGH (2002) Determination of friction coefficient encountered in large deformation processes. Tribol Int 35: 27-34.

[10] Khandaei M, Arabi H, Beig Mohammadi M (2020) A new method for investigating friction effects in forging processes using open die compression test of a cylindrical rod.  J Mech Eng 50(2): 77-82. (In Persian)

 [11] Wang L, Zhou J, Duszczyk J, Katgerman L (2012) Identification of a friction model for the bearing channel of hot aluminium extrusion dies by using ball-on-disc tests. Tribol Int 50: 66-75.

[12] Taureza SCM, Aue-u-lan Y, Lim SCV (2012) The influence of die geometry and workpiece mechanical properties in T-Shape friction test. J Mater Process Tech 212: 2413-2423.

[13] Zheng Y, Wang Z, Yoshikawa Y, Dong W (2017) Experimental investigation on friction law under starved lubrication in metal forming. Procedia Engineer 207: 2269-2273.

[14] Wang Z, Suzuki T, (2018) Friction law in dry metal forming of materials with work hardening. Procedia Manuf 15: 475-480.

[15] Seshacharyulu K, Bandhavi C, Naik BB, Rao SS, Singh SK (2018) Understanding friction in sheet metal forming-Areview. Mater Today 5: 18238-18244.

[16] Trzepiecinski T, Lemu HG (2020) Recent developments and trends in the friction testing for conventional sheet metal forming and incremental sheet forming. Metals 10(1): 47.

[17] Sulaiman MH, Farahana RN, Bienk K, Nielsen CV, Bay N (2019) Effects of DLC/TiAlN-coated die on friction and wear in sheet-metal forming under dry and oil-lubricated conditions: Experimental and  numerical studies. Wear 438-439(203040).

[18] Sigvant M, Pilthammar J, Hol J, Wiebenga JH, Chezan T, Carleer B, Boogaard TVD (2019) Friction in sheet metal forming: influence of surface roughness and strain rate on sheet metal forming simulation results. Procedia Manuf 29: 512-519.

[19] Xu Z, Huang J, Mao M, Peng L, Lai X (2020) An investigation on the friction in a micro sheet roll forming processes considering adhesion and ploughing. J Mater Process Tech 285(116790).

[20] Shisode MP, Hazrati J, Mishra T, Rooij MD, Boogaard TVD (2020) Modeling mixed lubrication friction for sheet metal forming. Procedia Manuf 47: 586-590.

[21] Vahdati AR, Vahdati M (2018) Experimental analysis the effect of lubricant and ultrasonic excitation of hemispherical-head tool on the vertical component of forming force in SPIF. Journal of Solid and Fluid Mechanics 8(2): 107-123. (In Persian)

[22] Bauser M, Sauer G, Siegert K (2006) Extrusion. 2nd edn. ASM, New York.

[23] Slater RAC (1977) Engineering plasticity, Theory and application to metal forming processes. MACMILLAN Press LTD.

[24] Mori T, Takatsuji N, Matsuki K, Aida T, Murotani K, Uetoko K (2002) Measurement of pressure distribution on die surface and deformation of extrusion die in hot extrusion of 1050 aluminum rod. J Mater Process Tech 130-131: 421-425.

[25] Guo NSZ, Schillé JP, Miodownik AP (2008) Modelling high temperature flow stress curves of titanium alloys. MRS international Materials Research Conference, 9-12 june.

[26] Li KPRLX, Lou Y, Peng DS (2002) A study on hot extrusion of Ti–6Al–4V using simulations and experiments. Int J Mech Sci 44: 2415-2425.