Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
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 |
Obtained results of sandwich structural composites tested
| Group | Laying angle | Failure load (N) | Bending strength (MPa) |
|---|---|---|---|
| A | [0°]8 | 762.67 | 64.63 |
| B | [0°/45°/90°/−45°]s | 454.23 | 38.49 |
| C | [0°/90°]4 | 355.80 | 30.15 |
| D | [45°/−45°]4 | 92.47 | 7.84 |
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 |
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 |