PP	Polypropylene
ISF	Incremental sheet forming
NIF	Negative incremental forming
CNC	Computerized numerical control
FEM	Finite element method
RVE	Representative volume element
t	Laminate thickness
a	Base radius of the spherical caps
θ	Polar angle of the spherical caps
CAD	Computer-aided design
vNIF	Speed of the tool for negative incremental forming processes
vSF	Speed of the tool for stretch-forming processes
NIF0	Negative incremental forming without partial counter die for spherical caps with base radius a = 40 mm and polar angle θ = 50°
NIFPD	Negative incremental forming with partial counter die for spherical caps with base radius a = 40 mm and polar angle θ = 50°
SF0	Stretch forming without partial counter die for spherical caps with base radius a = 40 mm and polar angle θ = 50°
SFPD	Stretch forming with partial counter die for spherical caps with base radius a = 40 mm and polar angle θ = 50°
SF*0	Stretch forming without partial counter die for spherical caps with base radius a = 20 mm and polar angle θ = 70°
FTOT	Module of the total forming force
hMAX	Maximum height of the caps