Elastic-Perfectly Plastic Material

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This command is used to construct an elastic perfectly-plastic uniaxial material object.

uniaxialMaterial ElasticPP $matTag $E $epsyP <$epsyN $eps0>

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$matTag	integer tag identifying material
$E	tangent
$epsyP	strain or deformation at which material reaches plastic state in tension
$epsyN	strain or deformation at which material reaches plastic state in compression.
	(optional, default is tension value)
$eps0	initial strain (optional, default: zero)

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Code Developed by: fmk