Fracture strength and behavior of carbon steel pipes with local wall thinning subjected to cyclic bending load
| Autor: | Akira Nebu, Kunio Hasegawa, Masayuki Ishiwata, Katsumasa Miyazaki |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Piping Carbon steel business.industry Mechanical Engineering education Bending Structural engineering engineering.material Fatigue limit Nuclear Energy and Engineering Flexural strength engineering Erosion General Materials Science Geotechnical engineering Deformation (engineering) Safety Risk Reliability and Quality business Waste Management and Disposal Displacement (fluid) |
| Zdroj: | Nuclear Engineering and Design. 214:127-136 |
| ISSN: | 0029-5493 |
| Popis: | The power plant piping is designed to withstand seismic events using the design fatigue curve. However, the fatigue strength of a pipe with local wall thinning caused by erosion/corrosion is not clear. To evaluate the fatigue strength of pipes with local wall thinning, low cycle fatigue tests were conducted on 100A carbon steel pipes with local wall thinning. In load controlled tests on these pipes, ratcheting deformation was observed, and the fatigue strength became lower than that of cracked pipes. In displacement controlled tests, the fatigue strength of eroded pipes with 100 mm in eroded axial length, 0.5 in normalized eroded depth and 90° in eroded angle was almost equal to that given by the design fatigue curve in ASME B&PV Code Sec. III. To evaluate the local strain range in the maximum wall thinning area, the finite element analysis was conducted on the eroded pipes in the displacement controlled tests. It is concluded that the Mises strain range in the maximum wall thinning area and the low cycle fatigue curve can be used to conservatively estimate the low cycle fatigue life of an eroded pipe and the validity of estimated results can be confirmed experimentally. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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