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Abstract
We have developed three types of multi layer Cu matrix composite brake pads, namely, Copper-silica-BN, Copper-Si3N4-graphite, and Copper-mullite-MoS2 to solve the problem of static torque, friction coefficient in the upgraded version of Trainer aircraft. These composite brake pads were tested in a full scale brake dynamometer and static torque testing unit at ARDC, HAL. Our results shows that the braking requirements of static torque (~ 204 Kgfm), friction coefficient (~0.3-0.45) were very well met in the multilayer Copper-mullite-MoS2 composite brake pads. The role of MoS2 and Mullite in improving static torque, friction coefficient and stabilizing frictional properties in this composite brake pads were explained in detail.
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References
- Dutta, D., Mohan, G., Chatterji, B. and Krishnadas Nair. C.G., "Indigenous Development of Sintered Friction Materials for Aircraft Brakes", Lecture Notes, Hindustan Aeronautics Limited, Bangalore, India, 2001.
- Chatterji, B., "High Energy Aircraft Friction Materials - Yet Another Man-Made Wonder", Golden Jubilee Commemoration Lecture (Tenth in the series), Table-1 : Braking Design Parameters for both Older and Upgraded Version Design Parameters Older Version Upgraded Version Aircraft maximum all up weight 4890 Kg 5400 Kg Brake energy 5.9 MJ 6.3 MJ Static torque 194 Kgfm 230 Kgfm Dynamic coefficient of friction 0.3 - 0.45 0.3 - 0.45 148 JOURNAL OF AEROSPACE SCIENCES & TECHNOLOGIES VOL.66, No.2 Indian Institute of Metals, 10th Lecture, The Indian Institute of Metals, Bangalore Chapter, Bangalore, India, 2002.
- Dutta, D. and Rao, PR., "Engineering Quality, Airworthiness and Reliability in Friction Material Formulations for High Energy Aircraft Brake Pads", QUEST, Vol.100, No.1, pp.E-1-E-14, 1996.
- E. Hornbogen., "The Role of Fracture Toughness in the Wear of Metals", Wear, , Vol.33, pp.251-259, January 1975.
- W.O. Winer., "Molybdenum Disulphide as a Lubricant: A Review of the Fundamental Knowledge", Wear, Vol.10, pp.422-452, February 1967.
References
Dutta, D., Mohan, G., Chatterji, B. and Krishnadas Nair. C.G., "Indigenous Development of Sintered Friction Materials for Aircraft Brakes", Lecture Notes, Hindustan Aeronautics Limited, Bangalore, India, 2001.
Chatterji, B., "High Energy Aircraft Friction Materials - Yet Another Man-Made Wonder", Golden Jubilee Commemoration Lecture (Tenth in the series), Table-1 : Braking Design Parameters for both Older and Upgraded Version Design Parameters Older Version Upgraded Version Aircraft maximum all up weight 4890 Kg 5400 Kg Brake energy 5.9 MJ 6.3 MJ Static torque 194 Kgfm 230 Kgfm Dynamic coefficient of friction 0.3 - 0.45 0.3 - 0.45 148 JOURNAL OF AEROSPACE SCIENCES & TECHNOLOGIES VOL.66, No.2 Indian Institute of Metals, 10th Lecture, The Indian Institute of Metals, Bangalore Chapter, Bangalore, India, 2002.
Dutta, D. and Rao, PR., "Engineering Quality, Airworthiness and Reliability in Friction Material Formulations for High Energy Aircraft Brake Pads", QUEST, Vol.100, No.1, pp.E-1-E-14, 1996.
E. Hornbogen., "The Role of Fracture Toughness in the Wear of Metals", Wear, , Vol.33, pp.251-259, January 1975.
W.O. Winer., "Molybdenum Disulphide as a Lubricant: A Review of the Fundamental Knowledge", Wear, Vol.10, pp.422-452, February 1967.