© 1982 by Oxford University Press
A DEFORMATION-THEORY ANALYSIS OF THE BIFURCATION OF PRESSURISED THICK-WALLED CYLINDERS
( Departments of Applied Mathematics and Civil Engineering, University of Cape Town Private Bag, Rondebosch 7700, Republic of South Africa )
Bifurcations of thick-walled circular cylindrical shells subsequent to a finite radially-symmetric inflation, and in a state of plane strain, are analysed. The model of material behaviour used is a generalisation to finite strains of J2 deformation theory of plasticity; the uniaxial stress-strain curve is represented by a simple power law.
Prismatic modes of bifurcation are investigated and results are presented for a variety of material and geometrical properties. Also, a limited comparison of results is made with those obtained by Chu (3) for the same problem but using J2 flow theory. The results for mode number n=1 are found to resemble closely the corresponding results for flow theory; however, the results for n=2 appear to be quite different. For very thin shells, though, the results are identical to those found using flow theory. Bifurcation is found always to occur after the occurrence of pressure maxima.