Evolution Law

This command is used to set the evolution law variable el to the specified type. There are two types of evolutions laws implemented: scalar (isotropic) evolution and tensorial (kinemartic) evolution. For scalar evolution law, there are linear scalar evolution law and nonlinear scalar evolution law. For tensorial evolution law, there are linear tensorial evolution law and nonlinear tensorial evolution law.

set el "-EvolutionLawType <parameter list>"

Valid strings for EvolutionLawType are Leq, NLp, LEij, and NLEij

For linear scalar evolution law

set el "-Leq $a"

For Cam-Clay type nonlinear scalar evolution law

set el "-NLp $e_o $lambda $k

For linear tensorial evolution law

set et "-LEij $a1"

For Armstrong-Frederick type nonlinear tensorial evolution law

set et "-NLEij $h_a $C_r"

$a	linear hardening coefficient
$e_o	initial void ratio
$lambda	nonlinear evolution law constant (Cam-Clay type)
$k	nonlinear evolution law constant (Cam-Clay type)
$a1	linear tensorial evolution law constant
$h_a	nonlinear tensorial evolution law constant (Armstrong-Frederick type)
$C_r	nonlinear tensorial evolution law constant (Armstrong-Frederick type)