RambergOsgood
Ramberg-Osgood Steel Model
Syntax
History Variable Layout
location
value
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
Remarks
Local iterations are required to obtain the stress value.
Theory
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".
Examples
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