A perfectly plastic cylinder for which b/a = 3 is subjected to internal pressure...

A perfectly plastic cylinder for which b/a = 3 is subjected to internal pressure causing yielding of the material to the mid-depth c = (a + b)/2. In terms of k and determine (a) the pressure between the elastic and plastic zones, (b) the radial stress at r = a and (c) the tangential stresses at r = b, r = c, r = a. and Note: Relationships derived (Sec. 12.14) depend on the ratios of the radii rather than on their magnitudes. Accordingly, convenient numbers such as a = 1, c = 2, and b = 3 may be employed.