A fiber-metal laminate of mutually bonded fiber-reinforced composite layers and metal sheets comprises a combination of a fiber-reinforced composite layer and an adjacent metal sheet, in which combination the properties satisfy the following relations:
Elam*Ecomp/(Emetal*tmetal2) has a value between a lower bound given by
a*(Vf−c)(b/(Vf−c)) with b=0.36 and c=0.3 (1a)
and zero when Vf≦0.3, (1b)
and an upper bound given by
a*(Vf−c)(b/(Vf−c)) with b=0.88 and c=0 (1c)
0.10≦Vf<0.54 (2)
0<Elam*Ecomp/(Emetal*tmetal2)<400*Vf kN/mm4 (3)
wherein a=1200 kN/mm
4; and
- Ecomp=tensile Young's modulus of the fiber-reinforced composite layer in kN/mm2 in the combination, taken in the direction of highest stiffness of the composite layer
- Elam=tensile Young's modulus of the total fiber-metal laminate in kN/mm2, taken in the same direction as for Ecomp
- Emetal=tensile Young's modulus of the metal sheet in kN/mm2 in the combination
- tmetal=thickness of the metal sheet in mm in the combination
- Vf=fiber volume fraction of the fiber-reinforced composite layer in the combination.