Last updated
Last updated
Ramberg-Osgood Steel Model
Local iterations are required to obtain the stress value.
The Ramberg-Osgood relationship is defined as
so
The cyclic response uses the difference between current reverse stress and previous reverse stress as "yield stress".
where is the offset and is the material constant controls hardening. Noting that , hence
At the yield stress, viz., , then
So the offset indicates the magnitude of plastic strain at yield stress.
initialize_history(0)
load_sign
initialize_history(1)
reverse_strain
initialize_history(2)
reverse_stress
initialize_history(3)
previous_reverse_strain
initialize_history(4)
previous_reverse_stress