RambergOsgoodSteel Material

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This command is used to construct a Ramberg–Osgood steel material object.

uniaxialMaterial RambergOsgoodSteel $matTag $fy $Es $a $n

$matTag integer tag identifying material
$fy yield strength
$E0 initial elastic tangent
$a “yield offset” and the Commonly used value for $a is 0.002
$n Parameters to control the transition from elastic to plastic branches. And controls the hardening of the material by increasing the "n" hardening ratio will be decreased.
Commonly used values for $n are ~5 or greater. ($n must be odd number).