Fig. 1
Schematic diagram of sandwich structure
Fig. 2
(a) Carbon fiber unidirectional prepreg, and (b) PMI foam board
Table 1
Specifications of the carbon fiber unidirectional prepreg
| Carbon yarn weight (g/m2) | Resin content (g/m2) | Resin weight (g/m2) | Gross weight (g/m2) | Thickness (mm) |
|---|---|---|---|---|
| 150 | 32 | 71 | 221 | 0.150 |
Table 2
Mechanical parameters of the PMI foam board
| Density (kg/m3) | Elastic modulus (MPa) | Poisson’s ratio | Shear modulus (MPa) | Tensile strength (MPa) | Compressive strength (MPa) | Shear strength (MPa) | Elongation at break (%) |
|---|---|---|---|---|---|---|---|
| 75 | 92 | 0.3 | 29 | 2.8 | 1.5 | 1.3 | 3.0 |
Fig. 3
Heating and curing process
Table 3
Laying methods for the specimens tested
| Specimen | Laying angle |
|---|---|
| A | [0°]8 |
| B | [0°/45°/90°/−45°]s |
| C | [0°/90°]4 |
| D | [45°/−45°]4 |
Fig. 4
Carbon fiber/PMI foam sandwich structural composite
(a) top view, (b) side view and (c) size (mm)
Fig. 5
Three-point bending testing setup: (a) schematic diagram and (b) experimental photo
Fig. 6
The bending process of the composite Group A
Fig. 7
Displacement-load curves
Fig. 8
Bending process of the composite group B
Fig. 9
Bending process of the composite group C
Fig. 10
Bending process of the composite group D