Table 1 Thickness, Young’s modulus, and bending stiffness of each material
Material | Thickness [mm] | Young’s modulus [MPa] | Bending stiffness [Nm2]a |
|---|---|---|---|
Cotton-lined PVC film | 0.3 | 185 | 1.3 × 10–5 |
Polyethylene tarpaulin | 0.07 | 402 | 3.5 × 10−7 |
Natural rubber | 0.25 | 3 | 1.2 × 10–7 |