Development Of Constitutive Equations For
Creep Damage Behaviour Under Multi-axial
States Of Stress
Author(s)
Q. Xu
Abstract
A generic formulation for creep damage constitutive equations for multi-axial
states of stress is proposed. First, the requirements of lifetime consistency and
creep deformation consistency have been specified. Then two functions of
states of stress were introduced to depict the influences of multi-axial states of
stress on rupture lifetime and strain at failure, respectively; this is similar to
that of separate yielding function and admissible function proposed and
employed in the development of the generalised plasticity theory. Previous
formulation and its applications are based only on lifetime consistency, and
the fundamental requirement of creep deformation consistency has not been
addressed, which results in incorrect prediction of creep strain and damage
evolution. Furthermore, previous formulation is unable to consider the effect
of mean stress on lifetime
Keywords
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