Table 2: Extrusion pressure comparison among experimental, Andrade's theoretical [16] and Modified Andrade’s theoretical extrusion pressure for AC12 clay through a circular die, considering an angular variation.
| Punch travel (mm) | Experimental extrusion pressure (kPa) |
Andrade theoretical extrusion pressure (kPa) |
Difference between Andrade and experimental pressure (%) |
Modified theoretical extrusion pressure (kPa) |
Difference between modified and experimental pressure (%) |
| 0.10 | 200.0 | 197.5 | -1.26 | 196.8 | -1.63 |
| 5.00 | 395.0 | 391.0 | -1.03 | 389.5 | -1.40 |
| 10.00 | 411.0 | 417.3 | 1.51 | 415.8 | 1.15 |
| 15.00 | 388.0 | 376.4 | -3.07 | 375.1 | -3.45 |
| 20.00 | 365.0 | 357.9 | -1.97 | 356.6 | -2.34 |
| 25.00 | 352.0 | 347.4 | -1.32 | 346.1 | -1.69 |
| 30.00 | 337.0 | 340.6 | 1.06 | 339.4 | 0.70 |
| 35.00 | 335.0 | 335.9 | 0.25 | 334.6 | -0.11 |
| 40.00 | 362.0 | 332.4 | -8.92 | 356.6 | -1.50 |
| 45.00 | 426.0 | 329.7 | -29.22 | 401.6 | -6.08 |
| 50.00 | 500.0 | 327.5 | -52.66 | 504.3 | 0.85 |