Notation

Abbreviations

Abbreviation	Meaning
bc	boundary condition
dof	degree of freedom
FD	finite differences
FEA	finite element analysis
FEM	finite element method
FYS	Fourier expansion based yield surface
GP	Gauss point
HardIsoLin	linear isotropic hardening
HardIsoNonlin	nonlinear isotropic hardening
HardKinLin	linear kinematic hardening
HardMix	mixed isotropic and kinematic hardening
HardMixLin	linear mixed isotropic and kinematic hardening
notan	no elasto-plastic consistent tangent modulus computation
NR	Newton-Raphson
mex	MATLAB executable
opt	optimization (inverse problem)
UT	uniaxial tension
UTC	uniaxial tension followed by uniaxial compression
VAF	Voce and Armstrong-Frederick hardening
VEVP	viscoelastic-viscoplastic

Variables

Variable	Meaning
C	stiffness matrix
CPlaneStress	stiffness matrix under plane stress
CC	elasto-plastic consistent tangent modulus
epsilonV	strain in Voigt notation
epsilonVp	plastic strain in Voigt notation
epsilonVp_prev	plastic strain at previous time/load step in Voigt notation
fun	objective function
fun_vec	objective function components gathered in a vector
in	input parameters
S	compliance matrix
SPlaneStress	compliance matrix under plane stress
sigmaV	stress in Voigt notation