Fig.1

Proportion of materials used in mainstream unmanned aerial vehicles

Table 1

Structural form and composition proportion of composite on unmanned aerial vehicle

Fig.2

Fabrication of a composite lattice shell［23］

Fig.3

Lattice stiffened cylindrical shell with skin［24］

Fig.4

Fiber path at intersection［28］

Fig.5

Influence of fibre waviness at intersection on lattice structure［29］

Fig.6

Fiber cutting at composite lattice intersection［31］

Fig.7

Winding process of composite lattice shell［32］

Fig.8

Helical ribs and hoop interlaced lattice structure［33］

Fig.9

Molding process of composite corrugated sandwich cylindrical shells［37］

Fig.10

Moulds for making process of longitudinal corrugated truss shell［38］

Fig.11

A lattice stiffened cylindrical shell prepared by molding［39］

Fig.12

Interlocking route for making fiber composite grille core［40］

Fig.13

Cutting foam sandwich strips and slotting together［41］

Fig.14

Double-curvature pyramidal lattice sandwich structure［43］

Fig.15

Shear web test setup for lattice shell［53］

Fig.16

Kagome-type lattice structure under axial compressive load［54］

Fig.17

Preparation technique of lattice shell structure［56］

Fig.18

Various types of lattice shell structure［58］

Fig.19

Joined cylindrical-conical shell［59］

Fig.20

Fabrication process of all-composite honeycomb sandwich shell［60］

Fig.21

Bionic tube structures with two lattice types［61］

Fig.22

Fabrication process of corrugated sandwich conical shell［65］

Fig.23

Composite curved shell structure with lattice core［66］

Fig.24

Failure modes of a carbon fiber composite cylindrical shell with longitudinal corrugated cores［67］

Fig.25

Fabrication process of carbon fiber honeycomb sandwich cylindrical shell［71］

Fig.26

Vibration test system for cylindrical shell with free boundary conditions［37］

Fig.27

The first five mode shapes of composite sandwich cylindrical shell with pyramidal truss-like cores［72］

Fig.28

Carbon fiber composite lattice sandwich curved shell structure［73］

Fig.29

Characteristic buckling modes for lattice shells under axial compression［75］

Fig.30

Buckling modes of lattice adapter under axial compression［76］

Fig.31

Geometrical characteristics of lattice conical shells［79］

Fig.32

Free vibration test system of cylindrical shell with lattice core［80］

Fig.33

Free vibration test system of non-uniform lattice-stiffened cylindrical shell［81］

Fig.34

All-composite wing skeleton of HALE validation aircraft［3］