Table 5 Comparison of the analytical calculations with the measurement results.
| Â | Screw type 1 | Screw type 2 | Screw type 3 | Screw type 4 | Screw type 5 | Screw type 6 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ST1_6 | ST1_7 | ST2_6 | ST2_7 | ST3_6.2 | ST3_7 | ST4_6.5 | ST4_7.5 | ST5_6.5 | ST5_7.5 | ST6_6.5 | ST6_7.5 | |
Measured results | ||||||||||||
PCF 15 \(\tau_{S} =\,\) \(2.8 \;{\text{MPa}}\) | ||||||||||||
Measured pull-out strength \(F_{exp}\) in Na | 870 ± 10 | 931 ± 12 | 855 ± 12 | 923 ± 12 | 965 ± 20 | 1074 ± 16 | 902 ± 10 | 975 ± 19 | 966 ± 18 | 1072 ± 12 | 858 ± 19 | 798 ± 24 |
Chapman pull-out strength \(F_{Ch}\) in N | 870 | 1112 | 801 | 1076 | 1003 | 1158 | 842 | 987 | 968 | 1148 | 834 | 888 |
Deviation to \(F_{exp}\) | 0% | 19% | − 6% | 17% | 4% | 8% | − 7% | 1% | 0% | 7% | − 3% | 11% |
Analytical pull-out strength \( F_{P}\) in N | 831 | 917 | 813 | 887 | 959 | 1063 | 878 | 958 | 913 | 1008 | 845 | 817 |
Deviation to \(F_{exp}\) | − 4% | − 2% | − 5% | − 4% | − 1% | − 1% | − 3% | − 2% | − 5% | − 6% | − 2% | 2% |
PCF 10 \(\tau_{S} =\,\) \(1.6 \;{\text{MPa}}\) | ||||||||||||
Measured pull-out strength \(F_{exp}\) in Na | 446 ± 4 | 476 ± 5 | 441 ± 13 | 479 ± 15 | 510 ± 13 | 555 ± 10 | 445 ± 12 | 491 ± 9 | 485 ± 13 | 534 ± 13 | 426 ± 6 | 435 ± 17 |
Chapman pull-out strength \(F_{Ch}\) in N | 497 | 635 | 458 | 615 | 573 | 662 | 481 | 564 | 553 | 656 | 476 | 507 |
Deviation to \(F_{exp}\) | 11% | 33% | 4% | 28% | 12% | 19% | 8% | 15% | 14% | 23% | 12% | 17% |
Analytical pull-out strength \(F_{P}\) in N | 475 | 524 | 465 | 507 | 548 | 607 | 502 | 548 | 522 | 576 | 483 | 467 |
Deviation to \(F_{exp}\) | 6% | 10% | 5% | 6% | 7% | 9% | 13% | 12% | 8% | 8% | 13% | 7% |
PCF 5 \(\tau_{S} =\,\) \(0.59\;{\text{ MPa}}\) | ||||||||||||
Measured pull-out strength \(F_{exp}\) in Na | 187 ± 1 | 209 ± 1 | 173 ± 2 | 201 ± 2 | 218 ± 3 | 248 ± 2 | 178 ± 2 | 196 ± 3 | 196 ± 1 | 221 ± 2 | 181 ± 2 | 190 ± 3 |
Chapman pull-out strength \(F_{Ch}\) in N | 183 | 234 | 169 | 227 | 211 | 244 | 177 | 208 | 204 | 242 | 176 | 187 |
Deviation to \(F_{exp}\) | − 2% | 12% | − 2% | 13% | − 3% | − 2% | 0% | 6% | 4% | 9% | − 3% | − 2% |
Analytical pull-out strength \(F_{P}\) in N | 175 | 193 | 171 | 187 | 202 | 224 | 185 | 202 | 192 | 212 | 178 | 172 |
Deviation to \(F_{exp}\) | − 6% | − 8% | − 1% | − 7% | − 7% | − 10% | 4% | 3% | − 2% | − 4% | − 2% | − 9% |
