D65 vs D80
D80 is 1.3 times as stiff as D65. It is 1.2 times as dense. Per unit mass D80 is 1.1 times as stiff. Strength: f_m,k = 65 MPa for D65, f_m,k = 80 MPa for D80.
Side by side
ratio = D80 / D65 · log scale| Property | D65 | D80 | Unit | Ratio | ¼×1×4× |
|---|---|---|---|---|---|
| E₁ Modulus, direction 1 | 18.5 | 24 | GPa | 1.3× | |
| E₂ Modulus, direction 2 | 1.23 | 1.6 | GPa | 1.3× | |
| E₃ Modulus, direction 3 | 1.23 | 1.6 | GPa | 1.3× | |
| G₁₂ Shear modulus 1-2 | 1.16 | 1.5 | GPa | 1.29× | |
| G₁₃ Shear modulus 1-3 | 1.16 | 1.5 | GPa | 1.29× | |
| E₀,₀₅ Modulus parallel to grain, 5 % fractile | 15.5 | 20.2 | GPa | 1.3× | |
| ρ Density | 900 | 1080 | kg/m³ | 1.2× | |
| ρ_k Density, characteristic (5 % fractile) | 750 | 900 | kg/m³ | 1.2× | |
| f_m,k Bending strength | 65 | 80 | MPa | 1.23× | |
| f_t,0,k Tension parallel to grain | 39 | 48 | MPa | 1.23× | |
| f_t,90,k Tension perpendicular to grain | 0.6 | 0.6 | MPa | 1× | |
| f_c,0,k Compression parallel to grain | 35 | 38 | MPa | 1.09× | |
| f_c,90,k Compression perpendicular to grain | 11.3 | 13.5 | MPa | 1.19× | |
| f_v,k Shear strength | 5 | 5 | MPa | 1× | |
| E/ρ Specific stiffness E/ρ · derived | 20.56 | 22.22 | MJ/kg | 1.08× | |
| c₀ Bar wave speed √(E/ρ) · derived | 4534 | 4714 | m/s | 1.04× | |
| f/ρ Specific strength f/ρ · derived | 72.22 | 74.07 | kJ/kg | 1.03× |
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.