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The detection of fatigue cracks by nondestructive testing methods
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Rathke, R. A. Todd Jr., P. H. Frecska, S. A. Rummel, W. D. |
| Copyright Year | 1974 |
| Description | X-radiographic penetrant, ultrasonic, eddy current, holographic, and acoustic emission techniques were optimized and applied to the evaluation of 2219-T87 aluminum alloy test specimens. One hundred eighteen specimens containing a total of 328 fatigue cracks were evaluated. The cracks ranged in length from 0.500 inch (1.27 cm) to 0.007 inch (0.018 cm) and in depth from 0.178 inch (0.451 cm) and 0.001 inch (0.003 cm). Specimen thicknesses were nominally 0.060 inch (0.152 cm) and 0.210 inch (0.532 cm) and surface finishes were nominally 32 and 125 rms and 64 and 200 rms respectively. Specimens were evaluated in the as-milled surface condition, in the chemically milled surface condition and, after proof loading, in a randomized inspection sequence. Results of the nondestructive test (NDT) evaluations were compared with actual crack size obtained by measurement of the fractured specimens. Inspection data was then analyzed to provide a statistical basis for determinating the threshold crack detection sensitivity (the largest crack size that would be missed) for each of the inspection techniques at a 95% probability and 95% confidence level. |
| File Size | 7124731 |
| Page Count | 162 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19740009172 |
| Archival Resource Key | ark:/13960/t9x10vx0f |
| Language | English |
| Publisher Date | 1974-02-01 |
| Access Restriction | Open |
| Subject Keyword | Materials, Nonmetallic Radiography Metal Fatigue X Ray Inspection Nondestructive Tests Acoustic Properties Holography Aluminum Alloys Cracking Fracturing Ultrasonics Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
