Calculate the maximum internal crack length allowable for a Ti-6Al-4V titanium alloy (Table 8.1) component that is loaded to a stress one-half its yield strength. Assume that the value of Y is 1.50.
Table 8.1 Room-Temperature Yield Strength and Plane Strain Fracture Toughness Data for Selected Engineering Materials
| Yield Strength |
| KIc |
|
Material | MPa | ksi | MPa√m | ksi√in. |
Aluminum alloya (7075-T651) | 495 | 72 | 24 | 22 |
Aluminum alloya (2024-T3) | 345 | 50 | 44 | 40 |
Titanium alloya (Ti-6Al-4V) | 910 | 132 | 55 | 50 |
Alloy steela (4340 tempered @ 260°C) | 1640 | 238 | 50.0 | 45.8 |
Alloy steela (4340 tempered @ 425°C) | 1420 | 206 | 87.4 | 80.0 |
| Ceramics |
|
|
|
Concrete | — | — | 0.2–1.4 | 0.18–1.27 |
Soda-lime glass | — | — | 0.7–0.8 | 0.64–0.73 |
Aluminum oxide | — | — | 2.7–5.0 | 2.5–4.6 |
| Polymers |
|
|
|
Polystyrene (PS) | 25.0–69.0 | 3.63–10.0 | 0.7–1.1 | 0.64–1.0 |
Poly(methyl methacrylate) (PMMA) | 53.8–73.1 | 7.8–10.6 | 0.7–1.6 | 0.64–1.5 |
Polycarbonate (PC) | 62.1 | 9.0 | 2.2 | 2.0 |
aSource: Reprinted with permission, Advanced Materials and Processes, ASM International, © 1990.
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