ABS	Acrylonitrile Butadiene Styrene
PLA	Polylactic Acid
AM	Additive Manufacturing
ME	Material Extrusion
FDM	Fused Deposition Modeling
CAD	Computer-Aided Design
TDC	Theory of Critical Distances
ASED	Average Strain Energy Density
SED	Strain Energy Density
EMC	Equivalent Material Concept
FMC	Fictitious Material Concept
SENB	Single Edge Notched Bending (specimen)
$\overline{\mathrm{W}}$	mean value of the strain energy density
Wc	critical strain energy density
Rc	critical radius
σu	ultimate tensile strength
σy	yield strength
σsy	tensile strength at yield
εyield	strain at yield
E	Young’s modulus
ν	Poisson´s ratio
Kc	material fracture toughness in stress intensity factor units
B	specimen thickness
KI	applied stress intensity factor
σmax	maximum principal stress at the notch tip
σu,EMC	equivalent tensile strength
σu,FMC	fictitious tensile strength
Kc,FMC	fictitious fracture toughness in stress intensity factor units
EFMC	fictitious Young´s modulus
Pmax,FMC	fictitious maximum load
Pcritical	predicted failure load
Pmax	maximum load
PQ	load provided by the intersection of the load-displacement curve and a line with a compliance 5% greater than the straight part of the load-displacement curve.
ρ	notch radius