This law defines as elastic-plastic material with thermal softening. When material
approaches melting point, the yield strength and shear modulus reduces to zero.
The melting energy is defined as:
(1)
Where,
is cold compression energy and
melting temperature is supposed to be constant. If the
internal energy
is less than
, the shear modulus and the yield strength are defined
by:
(2)
(3)
Where,
,
,
and
are the material parameters.
is given by a hardening rule:
(4)
The value of
is limited by
.
The material pressure
is obtained by solving
equation of state
related to the material (/EOS) as in
LAW3.