D24 vs D40
D40 is 1.3 times as stiff as D24. It is 1.1 times as dense. Per unit mass D40 is 1.1 times as stiff. Strength: f_m,k = 24 MPa for D24, f_m,k = 40 MPa for D40.
Side by side
ratio = D40 / D24 · log scale| Property | D24 | D40 | Unit | Ratio | ¼×1×4× |
|---|---|---|---|---|---|
| E₁ Modulus, direction 1 | 10 | 13 | GPa | 1.3× | |
| E₂ Modulus, direction 2 | 0.67 | 0.87 | GPa | 1.3× | |
| E₃ Modulus, direction 3 | 0.67 | 0.87 | GPa | 1.3× | |
| G₁₂ Shear modulus 1-2 | 0.63 | 0.81 | GPa | 1.29× | |
| G₁₃ Shear modulus 1-3 | 0.63 | 0.81 | GPa | 1.29× | |
| E₀,₀₅ Modulus parallel to grain, 5 % fractile | 8.4 | 10.9 | GPa | 1.3× | |
| ρ Density | 580 | 660 | kg/m³ | 1.14× | |
| ρ_k Density, characteristic (5 % fractile) | 485 | 550 | kg/m³ | 1.13× | |
| f_m,k Bending strength | 24 | 40 | MPa | 1.67× | |
| f_t,0,k Tension parallel to grain | 14 | 24 | MPa | 1.71× | |
| f_t,90,k Tension perpendicular to grain | 0.6 | 0.6 | MPa | 1× | |
| f_c,0,k Compression parallel to grain | 21 | 27 | MPa | 1.29× | |
| f_c,90,k Compression perpendicular to grain | 4.9 | 5.5 | MPa | 1.12× | |
| f_v,k Shear strength | 3.7 | 4.2 | MPa | 1.14× | |
| E/ρ Specific stiffness E/ρ · derived | 17.24 | 19.7 | MJ/kg | 1.14× | |
| c₀ Bar wave speed √(E/ρ) · derived | 4152 | 4438 | m/s | 1.07× | |
| f/ρ Specific strength f/ρ · derived | 41.38 | 60.61 | kJ/kg | 1.46× |
Values at the first thickness band or product form of each material (EN 338:2016; EN 338:2016). A minimum and a characteristic value are not the same kind of number — read the ratio as a guide. Each material's page lists every band and every source.