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Fatigue life until small cracks in aircraft structures: durability and damage tolerance
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Schijve, J. |
| Copyright Year | 1994 |
| Description | Crack initiation in notched elements occurs very early in the fatigue life. This is also true for riveted lap joints, an important fatigue critical element of a pressurized fuselage structure. Crack nucleation in a riveted lap joint can occur at different locations, depending on the riveting operation. It can occur at the edge of the rivet hole, at a small distance away from the hole, but still with subsequent crack growth through the hole, and ahead of the hole with a crack no longer passing through the hole. Moreover, crack nucleation can occur in the top row at the countersunk holes (outer sheet) or in the bottom row at the non-countersunk holes. Fractographic evidence is shown. The initial growth of the small cracks occurs as an (invisible) part through crack. As a consequence, predictions on the crack initiation life are problematic. After a though crack is present, the major part of the fatigue life has been consumed. There is still an apparent lack of empirical data on crack growth and residual strength of riveted lap joints, five years after the Aloha accident. Such data are very much necessary for further developments of prediction models. Some test results are presented. |
| File Size | 1309196 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950013062 |
| Archival Resource Key | ark:/13960/t3033s511 |
| Language | English |
| Publisher Date | 1994-09-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Microcracks Fatigue Life Riveted Joints Aircraft Construction Materials Durability Residual Strength Crack Propagation Crack Opening Displacement Aircraft Maintenance Yield Point Tolerances Mechanics Mathematical Models Fuselages Lap Joints Fractography Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
