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Fatigue crack closure analysis using digital image correlation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Johnston, William M. Leser, William P. Newman, John A. |
| Copyright Year | 2010 |
| Description | Fatigue crack closure during crack growth testing is analyzed in order to evaluate the critieria of ASTM Standard E647 for measurement of fatigue crack growth rates. Of specific concern is remote closure, which occurs away from the crack tip and is a product of the load history during crack-driving-force-reduction fatigue crack growth testing. Crack closure behavior is characterized using relative displacements determined from a series of high-magnification digital images acquired as the crack is loaded. Changes in the relative displacements of features on opposite sides of the crack are used to generate crack closure data as a function of crack wake position. For the results presented in this paper, remote closure did not affect fatigue crack growth rate measurements when ASTM Standard E647 was strictly followed and only became a problem when testing parameters (e.g., load shed rate, initial crack driving force, etc.) greatly exceeded the guidelines of the accepted standard. |
| File Size | 3289238 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20100021172 |
| Archival Resource Key | ark:/13960/t1gj4gh99 |
| Language | English |
| Publisher Date | 2010-05-01 |
| Access Restriction | Open |
| Subject Keyword | Metals And Metallic Materials Fatigue Materials Wakes Magnification Data Correlation Crack Closure Displacement Loads Forces Crack Propagation 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 |
