Sujoy Saha ,Samar C. Mondal ,Prabir Chandra Bhattacharyya ,



autofrettage,stress distribution,shear strees,elastic-plastic juncture,


The aim of the present paper is to investigate the influence of autofrettage on stress distribution and load bearing capacity of a thick spherical shell. Appling the maximum shear stress Theory and distortion energy theory an analytical equation for optimum radius c of elastic-plasic juncture, c(opt) is deduced in autofrettage technology. It revealed that the autofrettage increases the pressure inside the wall of a thing spherical shell that it can contain.


I. Harvey JF Theory and desing of pressure vessels. New York: Van Nostrand Reinhold Company Ltd, 1985

II. Brownell LE, Young EH. Process equipment design. New York: John Wiley & sons, 1959.

III. Yu G. Chemical pressure vessel and equipment (in Chinese). Beijing: Chemical Industries Press, 1980.

IV. Boresi Ap, Sidebottom OM, Seely FB, Smith JOI. Advanced machanies of materials, 3rd edn New York: John Wiley & sons, 1978.

V. Kong.F.Determining the opimum radius of the elastic-plastic junction, RC, for thick wall Autofrettage cylinder by graphic method, (in Chinese). Petrochemical equipment, 1986;15:11.

VI. Timashenko S. Strenth of materials, New York: Van Nostrand Reinrand Company Ltd,1978.

VII. Rao Singiresu S: Engineering optimization.

VIII. Srinath, L.S.: Advance Machanics of solied, of materials, Tata McGraw-Hill Publising Company Ltd, New Delihi,1998.

IX. Zhu, Ruilin and Yang Jinlai, International Journal of Pressure Vessel and piping 75 (1998) 443-446.

Sujoy Saha, Samar C. Mondal,Prabir Chandra Bhattacharyya View Download