Current fatigue analyses of metallic structures undergoing variable amplitude loading, including pressure vessels, are mostly based on linear cumulative damage concepts, as proposed by Palmgren and Miner. This type of analysis neglects any sequential effects of the loading history. Several studies have shown that linear cumulative damage theories can produce inconsistent fatigue life predictions. In this paper, both fatigue damage accumulation and cyclic elastoplastic behaviors of the P355NL1 steel are characterized, using block loading fatigue tests. The loading is composed by blocks of constant strain-controlled amplitudes, applied according to two and multiple alternate blocks sequences. Also, loading composed by blocks of variable strain-controlled amplitudes are investigated. The block loading illustrates that fatigue damage evolves nonlinearly with the number of load cycles, as a function of the block strain amplitudes. These observations suggest a nonlinear damage accumulation rule with load sequential effects for the P355NL1 steel. However, the damage accumulation nonlinearity and load sequential effects are more evident for the two block loading rather than for multiple alternate block sequences, which suggests that the linear Palmgren-Miner’s rule tend to produce better results for more irregular loading histories. Some phenomenological interpretations for the observed trends are discussed under a fracture mechanics framework.
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ASME 2007 Pressure Vessels and Piping Conference
July 22–26, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4279-7
PROCEEDINGS PAPER
Cyclic and Fatigue Behavior of the P355NL1 Steel Under Block Loading Available to Purchase
He´lder F. S. G. Pereira,
He´lder F. S. G. Pereira
UCVE, IDMEC, Porto, Portugal
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Abi´lio M. P. De Jesus,
Abi´lio M. P. De Jesus
University of Tra´s-os-Montes and Alto Douro, Vila Real, Portugal
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Anto´nio A. Fernandes,
Anto´nio A. Fernandes
University of Porto, Porto, Portugal
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Alfredo S. Ribeiro
Alfredo S. Ribeiro
University of Tra´s-os-Montes and Alto Douro, Vila Real, Portugal
Search for other works by this author on:
He´lder F. S. G. Pereira
UCVE, IDMEC, Porto, Portugal
Abi´lio M. P. De Jesus
University of Tra´s-os-Montes and Alto Douro, Vila Real, Portugal
Anto´nio A. Fernandes
University of Porto, Porto, Portugal
Alfredo S. Ribeiro
University of Tra´s-os-Montes and Alto Douro, Vila Real, Portugal
Paper No:
PVP2007-26550, pp. 351-361; 11 pages
Published Online:
August 20, 2009
Citation
Pereira, HFSG, De Jesus, AMP, Fernandes, AA, & Ribeiro, AS. "Cyclic and Fatigue Behavior of the P355NL1 Steel Under Block Loading." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 1: Codes and Standards. San Antonio, Texas, USA. July 22–26, 2007. pp. 351-361. ASME. https://doi.org/10.1115/PVP2007-26550
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