D35 vs D40
D40 is 1.1 times as stiff as D35. Their densities are about the same. Per unit mass they are about equally stiff (18.46 and 19.7 MJ/kg). Strength: f_m,k = 35 MPa for D35, f_m,k = 40 MPa for D40.
Side by side
ratio = D40 / D35 · log scale| Property | D35 | D40 | Unit | Ratio | ¼×1×4× |
|---|---|---|---|---|---|
| E₁ Modulus, direction 1 | 12 | 13 | GPa | 1.08× | |
| E₂ Modulus, direction 2 | 0.8 | 0.87 | GPa | 1.09× | |
| E₃ Modulus, direction 3 | 0.8 | 0.87 | GPa | 1.09× | |
| G₁₂ Shear modulus 1-2 | 0.75 | 0.81 | GPa | 1.08× | |
| G₁₃ Shear modulus 1-3 | 0.75 | 0.81 | GPa | 1.08× | |
| E₀,₀₅ Modulus parallel to grain, 5 % fractile | 10.1 | 10.9 | GPa | 1.08× | |
| ρ Density | 650 | 660 | kg/m³ | 1.02× | |
| ρ_k Density, characteristic (5 % fractile) | 540 | 550 | kg/m³ | 1.02× | |
| f_m,k Bending strength | 35 | 40 | MPa | 1.14× | |
| f_t,0,k Tension parallel to grain | 21 | 24 | MPa | 1.14× | |
| f_t,90,k Tension perpendicular to grain | 0.6 | 0.6 | MPa | 1× | |
| f_c,0,k Compression parallel to grain | 25 | 27 | MPa | 1.08× | |
| f_c,90,k Compression perpendicular to grain | 5.4 | 5.5 | MPa | 1.02× | |
| f_v,k Shear strength | 4.1 | 4.2 | MPa | 1.02× | |
| E/ρ Specific stiffness E/ρ · derived | 18.46 | 19.7 | MJ/kg | 1.07× | |
| c₀ Bar wave speed √(E/ρ) · derived | 4297 | 4438 | m/s | 1.03× | |
| f/ρ Specific strength f/ρ · derived | 53.85 | 60.61 | kJ/kg | 1.13× |
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.