Open Access Open Access  Restricted Access Subscription or Fee Access

Kinematic Hardening Trend of Flow Formed Seamless Tubes of Aluminium Alloys used for Aerospace

Prantik Mukhopadhyay


The current trend of making seamless tubes of aluminium alloys is flow forming. The strength, ductility and toughness are the properties of interest for proper alloy design of tubes to withstand combustion pressure from propellants, elevated temperature creep and stress corrosion, especially in marine environments. The final strength of the flow formed tubes is known to control these properties. Therefore, an efficient kinematic flow stress simulator has been formulated to simulate the flow stress with the flow forming time, combining Taylor theory with the dislocation dynamics. The proposed simulator works on the principles of initial strength, shear constant, self-diffusivity and crystallographic texture to optimize the normal flow forming processes at versatile strain rate and temperature. The externally applied strain rate has been converted to the strain rate as material properties. The kinematic hardening during the flow forming has been addressed, emphasizing the work hardening and the energetic instability criterion based on dynamic recovery, to simulate the resultant flow stress. The design criteria of creep and stress corrosion resistant seamless tubes have been envisaged.

Full Text:



V. J. Sundaram. “Missile materials-current status and challenges”. Bulletin of Materials Science. 1996; 19(6): 1025–1029.

C. E. Snee, The use of the modern assel mill in the production of seamless tubing, Iron Steel Eng., 1956, 33, p 124.

George Dieter. Mechanical Metallurgy. SI Metric Ed. McGraw-Hill, London, 1988, p 634.

Roberts, W. L. An approximate theory of temper rolling, Iron Steel Engineering. 1972; 49(10): 56–63.

George Dieter. Mechanical Metallurgy. SI Metric Ed. McGraw-Hill, London, 1988, p 646.

Mohammad Habibi Parsa, A. M. A. Pazooki, Mahmoud Nilij- Ahmadabadi. Flow forming and flow formability simulation, The International Journal of Advanced Manufacturing Technology, May 2009, 42(5-6): 463–473.

Geoffrey Ingram Taylor. Plastic strain in metals. J. Inst. Met., 1938, 62, p 307.

Prantik Mukhopadhyay, Kannaki Pondicheery, S; M. Srinivas, Manish Roy, Microstructural developments during abrasion of M50 bearing steel, Wear. 2014, 315(1-2): 31–37.

Derek Hull, D. J. Bacon, Introduction to dislocations, 5th Edition, Elsevier, London, 2011, p 59.

Ran Wei, Futing Bao, Yang Liu, Weihua Hui. Precise design of solid rocket motor heat insulation layer thickness under non-uniform dynamic burning rate. International Journal of Aerospace Engineering. 2019; Volume 2019.

C. Vargel. Corrosion of aluminium, Elsevier Science, 2004, 293–296.

Jeremy S. Robinson, R. L. Cudd, James MB Evans. Creep resistance aluminium alloys and their applications. February 2003; Materials Science & Technology. 2003; 19(2): 143–155.

H. Jiang, R. G. Faulkner. “Modeling of grain-boundary segregation, precipitation and precipitate free zones of high strength aluminium alloys-I. The model.” Acta Materilia. May 1996; 44(5), 1857–1864.

Mukhopadhyay, P. Quantitative analysis of dynamic recovery during warm working of fcc alloys. Will be communicated.

N. H. Polakowski. Suppression of the Bauschinger effect and changes in flow pattern of ductile metals caused by cyclic tortional strains, ASTM, 1963, 63, 533–545.

J. P Hirth, J. Lothe. Theory of dislocations. 2nd Ed. John Wiley & Sons, New York, 1982.


  • There are currently no refbacks.

eISSN: 2231-038X