Elastic-Perfectly Plastic (EPP)

Description

The ElasticPP, or EPP, material is a model of one-dimensional perfect plasticity that can be used anywhere a UniaxialMaterial object is expected in OpenSees. By default the ElasticPP material has the same yield strain magnitude in tension and compression, but different yield strains can be specified. In addition, the model has an optional argument for the initial material strain.

Syntax

ops.uniaxialMaterial('ElasticPP',tag,E,epsP)
ops.uniaxialMaterial('ElasticPP',tag,E,epsP,epsN)
ops.uniaxialMaterial('ElasticPP',tag,E,epsP,epsN,eps0)

Parameters

tag : integer Unique material identifer
E : float Elastic modulus
epsP : float Yield strain (yield stress divided by elastic modulus)

Optional Parameters

epsN : float Yield strain for negative strains (default=-epsP)
eps0 : float Initial strain for the material (default=0)

Examples

# EPP material with modulus 29000 and yield stress of 60
E = 29000.0
ops.uniaxialMaterial('ElasticPP',1,E,60/E)

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