TABLE III.
Metrics calculated in this study.
| Cohorts | Machined | Printed with Speeds (mm/min) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1000 | 1500 | 2000 | 3000 | |||||||
| Mean | Standard deviation | Mean | Standard deviation | Mean | Standard deviation | Mean | Standard deviation | Mean | Standard deviation | |
| Compression | ||||||||||
| Stiffness (N/mm) | 10184 | 1108 | 9324 | 333 | 7698 | 1151 | 8249 | 296 | 7541 | 304 |
| Ultimate Force (N) | 14229 | 335 | 8964 | 304 | 8336 | 1044 | 7949 | 559 | 7856 | 167 |
| Ultimate Displacement (mm) | 3.12 | 0.419 | 1.43 | 0.175 | 1.55 | 0.848 | 1.51 | 0.182 | 1.63 | 0.054 |
| Compression - Shear | ||||||||||
| Stiffness (N/mm) | 1123 | 94 | 929 | 114 | 953 | 308 | 976 | 106 | 854 | 178 |
| Ultimate Force (N) | 2140 | 195 | 971 | 243 | 1511 | 540 | 862 | 131 | 906 | 206 |
| Ultimate Displacement (mm) | 3.06 | 0.668 | 2. 23 | 0. 303 | 2.89 | 1.07 | 1.70 | 0.811 | 1.81 | 0.843 |
| Torsion | ||||||||||
| Stiffness (Nm/deg) | 2.26 | 0.262 | 1.37 | 0.373 | 1.50 | 0.238 | 1.16 | 0.159 | 1.15 | 0.164 |
| Ultimate Moment (Nm) | 11.7 | 0.193 | 11.2 | 0.559 | 11.3 | 0.348 | 10.5 | 0.895 | 10.2 | 0.502 |
| Ultimate displacement (deg) | 18.8 | 5.40 | 16.3 | 4.16 | 15.5 | 3.13 | 16.7 | 2.40 | 16.1 | 2.11 |
| LM Measurements | ||||||||||
| Crack width (microns) | N/A | N/A | 87.5 | 13.7 | 51.8 | 24.3 | 71.2 | 36.0 | 87.3 | 61.3 |
| Layer width (microns) | N/A | N/A | 96.1 | 27.5 | 110 | 17.8 | 112 | 12.7 | 130 | 25.5 |
| Porosity | ||||||||||
| Porosity percentage (%) | 0 | 0 | 1.88 | 1.12 | 3.82 | 0.89 | 2.99 | 0.92 | 19.6 | 2.70 |
| Average pore size (microns) | 0 | 0 | 97.0 | 32.5 | 116 | 25.3 | 80.6 | 17.9 | 135 | 22.5 |
| Crystallinity | ||||||||||
| XRD (%) | 48.5 | 0.95 | 49.5 | 4.32 | 47.9 | 4.26 | 48.6 | 3.38 | 49.1 | 3.13 |
| FTIR (%) | 20.0 | 0.700 | 19.7 | 0.735 | 20.3 | 0.301 | 20.3 | 0.602 | 20.2 | 0.394 |