| Materials: | Ti-6Al-4V Titanium | ||
| Alloy Designation or Specification: | MIL-T-9046, Type III, Composition C | ||
| Product Form: | Plate | ||
| Heat Treatment: | Mill Annealed | ||
| Heat Number(s): | Ingot 295338 | ||
| Chemistry (% by weight): | |||
| C | 0.02 | ||
| N | 0.010 | ||
| Fe | 0.18 | ||
| Al | 6.4 | ||
| V | 4.2 | ||
| O | 0.127 | ||
| H | 81 (PPM) | ||
| Data Source(s): | Feddersen, C. E., and Hyler, W. S., “Fracture and Fatigue-Crack Propagation Characteristics of 1/4 Inch Mill Annealed Ti-6Al-4V Titanium Alloy Plate”, Report No. G9706, Battelle (1971). | ||
| Specimen Description: | |||
| Type: | M (T) Panel | ||
| Thickness: | 0.250 inch | ||
| Width: | 9, 16, 32 inches | ||
| Crack Orientation: | L-T | ||
| Location w-r-t Product Thickness: | Through-thickness specimen | ||
| Surface Finish: | Not Indicated | ||
| Test Conditions: | |||
| No. of Specimens: | 9 | 7 | 6 |
| Maximum Stress or Load: | 5, 10, 30 ksi | 5, 10, 30, 50 ksi | 10, 30, 50 ksi |
| Stress Ratio: | 0.10 | 0.40 | 0.70 |
| Cyclic Frequency: | 1-25 Hz | ||
| Environment: | 50% relative humidity | ||
| Temperature: | 68 ± 2°F | ||
| Buckling Restraints?: | Yes | ||
| Crack Monitoring Technique: | Optical | ||
| Additional Comments: | |||
| 1. Frequency was varied from 1 to 25 Hz according to the magnitude of stress range, no frequency effects were noted in this environment. | |||
| 2. From 20 to 70 crack readings were made on each specimen. | |||
| 3. No panel width effects on FCG rates were evident. | |||
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