Background
Chemical and Mechanical Testing
Finite Element Modeling
Materials |
E (ksi) |
ν
|
σ
Y (ksi) | ||
---|---|---|---|---|---|
Blue regions (elastic) | 29,000 | .29 | … | ||
E71 welds (green) | 29,000 | .29 | 58 | ||
E110 welds (white) | 29,000 | .29 | 98 | ||
Tubes, A508 steel (purple) | 29,000 | .29 | 70 | ||
Plates, A516 steel (red) | 29,000 | .29 | 38 | ||
Tie rod, 4340 steel (orange) | |||||
Min strength, NE tie rod | 29,000 | .29 | 121 | ||
Max strength, SW tie rod | 29,000 | .29 | 156 |
Results
Tie rod material | Tie rod preload | Nut interface | Weld status | Peak mises stress (ksi) | Cyclic mean stress (ksi) | Cyclic alternating stress (ksi) | |
---|---|---|---|---|---|---|---|
Piston load applied | Piston load removed | ||||||
NE | 868 kip | Parallel | Intact | 128.1 | 83.2 | 86.4 | 42.1 |
NE | 868 kip | Parallel |
Failed
| 128.1 | 83.2 | 86.6 | 42.0 |
NE | 868 kip |
Misaligned
| Intact | 128.2 | 85.3 | 91.8 | 36.5 |
NE | ~0 kip
| Parallel | Intact | 126.8 | 70.7 | 31.8 | 97.3 |
NE | ~0 kip
| Parallel |
Failed
| 126.8 | 70.4 | 31.9 | 97.1 |
SW | 868 kip | Parallel | Intact | 160.5 | 104.2 | 118.3 | 42.1 |
SW | 868 kip | Parallel |
Failed
| 160.4 | 104.2 | 118.4 | 42.0 |
SW | 868 kip |
Misaligned
| Intact | 162.8 | 112.6 | 125.8 | 37.0 |
SW | ~0 kip
| Parallel | Intact | 158.8 | 37.5 | 60.9 | 97.3 |
SW | ~0 kip
| Parallel |
Failed
| 158.8 | 37.3 | 61.0 | 97.2 |