S-N curves of structural materials are obtained through fatigue tests. These tests are often performed using five different stress levels, with fifteen test specimens for each stress level. This kind of test plan provides estimates that are less precise compared to other experimental plans, for example, the ones called optimum plan or compromise plan. The main reason for this drawback is the use of the same number of specimens for all stress levels. It has been observed that less precise results are obtained for lower stress levels because failure occurs less frequently. That is why more specimens should be used for lower stress levels as compared to higher stress levels. As long as the number of specimens to be tested at low stress levels is increased, the total number of failures will also increase, which allows one to develop a more precise data analysis. The objective of this work is to present an alternative experimental plan to obtain S-N curves, which intends to provide accurate estimators. A practical application is done for planning a fatigue test, in a flex-rotating machine, to obtain the S-N curve of SAE 8620 steel.
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ASME 2002 Pressure Vessels and Piping Conference
August 5–9, 2002
Vancouver, BC, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-1949-3
PROCEEDINGS PAPER
Fatigue Test Plan to Obtain S-N Curves
Joa˜o Ma´rio Andrade Pinto,
Joa˜o Ma´rio Andrade Pinto
CNEN/CDTN/IT1, Belo Horizonte, MG, Brazil
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Enrico A. Colosimo,
Enrico A. Colosimo
UFMG, Belo Horizonte, MG, Brazil
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Tanius Rodrigues Mansur,
Tanius Rodrigues Mansur
CNEN/CDTN/IT1, Belo Horizonte, MG, Brazil
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Julio Ricardo Barreto Cruz,
Julio Ricardo Barreto Cruz
CNEN/CDTN/IT1, Belo Horizonte, MG, Brazil
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Ernani Sales Palma,
Ernani Sales Palma
PUC Minas, Belo Horizonte, MG, Brazil
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Miguel Mattar Neto
Miguel Mattar Neto
CNEN/IPEN, Sa˜o Paulo, SP, Brazil
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Joa˜o Ma´rio Andrade Pinto
CNEN/CDTN/IT1, Belo Horizonte, MG, Brazil
Enrico A. Colosimo
UFMG, Belo Horizonte, MG, Brazil
Tanius Rodrigues Mansur
CNEN/CDTN/IT1, Belo Horizonte, MG, Brazil
Julio Ricardo Barreto Cruz
CNEN/CDTN/IT1, Belo Horizonte, MG, Brazil
Ernani Sales Palma
PUC Minas, Belo Horizonte, MG, Brazil
Miguel Mattar Neto
CNEN/IPEN, Sa˜o Paulo, SP, Brazil
Paper No:
PVP2002-1209, pp. 201-204; 4 pages
Published Online:
August 14, 2008
Citation
Pinto, JMA, Colosimo, EA, Mansur, TR, Cruz, JRB, Palma, ES, & Neto, MM. "Fatigue Test Plan to Obtain S-N Curves." Proceedings of the ASME 2002 Pressure Vessels and Piping Conference. New and Emerging Computational Methods: Applications to Fracture, Damage, and Reliability. Vancouver, BC, Canada. August 5–9, 2002. pp. 201-204. ASME. https://doi.org/10.1115/PVP2002-1209
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