BIAXIAL RATCHETING AND CYCLIC PLASTICITY FOR BREE-TYPE LOADING .2. COMPARISON BETWEEN FINITE-ELEMENT ANALYSIS AND THEORY

In Part I of this two part paper (Ng and Nadarajah, 1996), the results of an extensive program of finite element analyses were described. Th e problem being considered is the phenomenon of ratcheting and cyclic stress-strain hysteresis loop behavior in a thin-walled cylinder subje ct to cyclic thermal stress and sustained internal pressure. The purpo se of Part II is to compare the finite element results with two analyt ical solutions and review the applicability of the latter as' a design procedure for assessment of these types of structures. The comparison shows that the ratcheting to shakedown boundaries based on F.E. and a nalytical models are in close agreement. The hoop ratcheting rates pre dicted by the uniaxial model enveloped the F.E. and biaxial models, wh ile for the axial ratcheting rates, the F.E. results are upper bound.