$\left[\widehat{\sigma }\right]$	Effective stress of lamina (MPa)
YT	Transverse tensile strength (MPa)
SL	Longitudinal shear strength (MPa)
ST	Transverse shear strength (MPa)
YC	Transverse compressive strength (MPa)
XT	Longitudinal tensile strength (MPa)
XC	Longitudinal compressive strength (MPa)
$d_m^t$	Matrix damage initiation variable in lamina under tensile load
$d_m^c$	Matrix damage initiation variable in lamina under compressive load
$d_f^t$	Fiber damage initiation variable in lamina under tensile load
$d_f^c$	Fiber damage initiation variable in lamina under compressive load
D	Damage operator in post-damage initiation process
${\mathrm{d}}_{\mathrm{f}},{\mathrm{d}}_{\mathrm{m}}$, and ${\mathrm{d}}_{\mathrm{s}}$	Internal damage variable corresponding to lamina fiber, matrix, and shear damage modes
GC	Fracture energy (N/mm)
GXT	Longitudinal tensile fracture energy (N/mm)
GXC	Longitudinal compressive fracture energy (N/mm)
GYT	Transverse tensile fracture energy (N/mm)
GYC	Transverse compressive fracture energy (N/mm)
GDDE	Damage dissipation energy (N/mm)
dp	Damage evolution variable
$k_{eq}^0$	Equivalent elastic stiffness at the onset of damage (MPa)
${\delta }_{eq}^0$	Equivalent displacement at the onset of damage (mm)
${\delta }_{eq}^f$	Equivalent displacement at the separation of the material point (mm)
${\mathsf{\sigma }}_{ij}^o,$${\mathsf{\tau }}_{ij}^o,$ and ${\mathsf{\epsilon }}_{ij}^o$	Effective stresses (MPa) and strains at the onset of damage
${\mathsf{\delta }}_{\mathrm{eq}}^0$	Equivalent displacement at the state of damage initiation (mm)
${\mathsf{\delta }}_{\mathrm{eq}}^{\mathrm{f}}$	Equivalent displacement at failure (mm)
${\mathrm{L}}^{\mathrm{c}}$	Characteristic length of an element (mm)
$E_U$	Internal energy (N/mm)
${\mathsf{\sigma }}^{\mathrm{c}}$	Stress (MPa)
${\dot{\mathit{\epsilon }}}^{el}, {\dot{\mathit{\epsilon }}}^{pl}, {\dot{\mathit{\epsilon }}}^{cr}$	Time rate of elastic, plastic, and creep strains
$E_S$	Elastic strain energy (N/mm)
${\mathit{\sigma }}^u$	Un-damaged stress (MPa)
$f^u$	Undamaged elastic energy function
$f^c$	Damage strain energy function
EE and ED	Recoverable and irrecoverable energy (N/mm)
$h$ and $s$	Interaction between the nodes-in-contact as separation and sliding motions (mm)
${\mathrm{N}}_{\mathrm{i}}$	Interpolation function of the interface segments
${\mathsf{\rho }}_{\mathrm{n}}$	Interface segment curvature
$D_{ij}$	Stiffness matrix of interface with linear coupled elastic behavior (MPa)
$F_i$	Force of interface node $i^{th}$ (N)
$u_i$	Motion of interface node $i^{th}$ (mm)