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Test simulation conditions with different values of relative depth a/t_
| Test | Do mm | Di mm | t mm | a/t |
|---|---|---|---|---|
| 1 | 350 | 344 | 3 | 0.30 |
| 2 | 350 | 342 | 4 | 0.25 |
| 3 | 350 | 340 | 5 | 0.20 |
| 4 | 350 | 339 | 6 | 0.16 |
Mechanical properties of X52 steel_ (Harter, 2002; NASA, 2001)
| Young’s modulus E (MPa) | 200 |
| Poisson’s ratio υ | 0.30 |
| Yield stress σY (MPa) | 410 |
| Ultimate tensile stress σUTS (MPa) | 498 |
| Elongation εf (%) | 35 |
| Toughness fracture (Mpa.mm1/2) | 95 |
| Threshold (MPa.mm1/2) | 7 |
Tests simulation conditions with different values of outer diameter Do_
| Test | Do mm | Di mm | t mm | a/t |
|---|---|---|---|---|
| 1 | 350 | 340 | 5 | 0.2 |
| 2 | 345 | 335 | 5 | 0.2 |
| 3 | 340 | 330 | 5 | 0.2 |
| 4 | 335 | 325 | 5 | 0.2 |
Tests simulation conditions with different values of aspect ratio a/c_
| Test | Depth | Length | Aspect ratio |
|---|---|---|---|
| a mm | c mm | a/c | |
| 1 | 1 | 1 | 1 |
| 2 | 1 | 1.2 | 0.83 |
| 3 | 1 | 1.4 | 0.71 |
| 4 | 1 | 1.6 | 0.62 |
| 5 | 1 | 1.8 | 0.55 |
| 6 | 1 | 2 | 0.50 |
Mechanical properties of X52 steel for NASGROW model_ (Harter, 2002; NASA, 2001)
| Young’s modulus E (MPa) | 200 |
| Poisson’s ratio υ | 0.30 |
| Yield stress σY(MPa) | 410 |
| Ultimate tensile stress σUTS(MPa) | 498 |
| Elongation εf (%) | 35 |
| Toughness fracture Kc (Mpa.mm1/2) | 95 |
| Threshold Kth (Mpa.mm1/2) | 200 |
| p | 0.65 |
| q | 0.001 |
| C | 1.15e-10 |
| n | 2.41 |