The Effect of Static and Fatigue Loading on Residual Stress Induced by Laser Peening
| Autor: | Yuji Sano, Koichi Akita, Shin-ichi Ohya, Toshiyuki Saito, Takahiro Sakai |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Mechanical Engineering Laser peening chemistry.chemical_element Condensed Matter Physics Compression (physics) Residual chemistry Mechanics of Materials Residual stress Aluminium Ultimate tensile strength Fracture (geology) Relaxation (physics) General Materials Science Composite material |
| Zdroj: | Journal of the Society of Materials Science, Japan. 57:648-653 |
| ISSN: | 1880-7488 0514-5163 |
| Popis: | The effect of static and fatigue loading on the residual stress induced by laser peening has been investigated on the aluminum alloy JIS A2024-T3. X-ray diffraction was applied to laser-peened samples to measure surface residual stress before and after subjecting the sample to static tensile or fatigue loading. Plastic deformation of the internal surfaces before and after loading was evaluated from the diffraction peak width associated with the loading. During static tensile loading, the interior of the sample started to deform plastically due to the superposition of external loading and residual tensile stress that compensated for the surface compression by laser peening; this resulted in the relaxation of the surface residual stress after unloading. In the case of fatigue loading, the residual stress on the surface was relaxed during the first loading cycle due to the same mechanism as that observed in the static tensile loading. The degree of the relaxation could be estimated taking the results of the static loading into account. Significant further relaxation was not observed after the first cycle until just before the final fracture. |
| Databáze: | OpenAIRE |
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