330
23 The Fluidity at the Finite Speed of Loading
Fig. 23.1 Dependency of the steel yield stress on the loading rate
Fig. 23.2 Time of yield delay in the case of instantaneous application of loading
23.3 Components of Deformational Softening
Assume that diffusive structural changes cause material softening equal in all
planes and directions. This softening will be called isotropic. Let us represent the
component of isotropic deformational softening by some function of the following
argument:
=
T 0
t y
F [τ m (t)]dt.
(23.9)
Let us call the value defined by formula (23.9) as the primary argument of
isotropic aging.
Then, as a result of aging, material softening occurs in some direction λ, and
softening with the equal modulus but opposite in the sign occurs in the opposite
23 The Fluidity at the Finite Speed of Loading
Fig. 23.1 Dependency of the steel yield stress on the loading rate
Fig. 23.2 Time of yield delay in the case of instantaneous application of loading
23.3 Components of Deformational Softening
Assume that diffusive structural changes cause material softening equal in all
planes and directions. This softening will be called isotropic. Let us represent the
component of isotropic deformational softening by some function of the following
argument:
=
T 0
t y
F [τ m (t)]dt.
(23.9)
Let us call the value defined by formula (23.9) as the primary argument of
isotropic aging.
Then, as a result of aging, material softening occurs in some direction λ, and
softening with the equal modulus but opposite in the sign occurs in the opposite