Abstract
This paper presents an experimental and analytical study of crack shape evolution in steel specimens under cyclic loading. It is widely known that the introduction of compressive residual stresses by cold working the surface can be highly beneficial in improving the fatigue performance of structural components. Although it is recognised that relaxation of surface compressive residual stress can reduce the potential benefits, the effects of residual stress on crack shape evolution are often overlooked. A recently developed technique termed controlled stitch cold working, which applies differing intensities of compressive residual stress at specific regions in a structure, is shown in the paper to considerably influence fatigue crack propagation by containing crack propagation in one primary direction.
| Original language | English |
|---|---|
| Pages (from-to) | 355-363 |
| Number of pages | 9 |
| Journal | Engineering Fracture Mechanics |
| Volume | 75 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 1 Feb 2008 |
| Externally published | Yes |
Funding
The authors gratefully acknowledge the financial support of NDE Technology Limited in funding this work, Lt J Boyle (RN) for carrying out Test 3, and Ms S Ng for Tests 4 and 5.
Keywords
- cold rolling
- crack shape control
- fatigue
- residual stress
- RMS stress intensity factors
- surface crack
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