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RESEARCH PAPERS

Low and High Cycle Fatigue and Cyclic Elasto-Plastic Behavior of the P355NL1 Steel

[+] Author and Article Information
Abílio M. P. De Jesus

Engineering Department–Mechanical Engineering, University of Trás-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugalajesus@utad.pt

Alfredo S. Ribeiro

Engineering Department - Mechanical Engineering, University of Trás-os-Montes and Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugalaribeiro@utad.pt

António A. Fernandes

Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugalaaf@fe.up.pt

J. Pressure Vessel Technol 128(3), 298-304 (Jun 29, 2005) (7 pages) doi:10.1115/1.2217961 History: Received December 20, 2004; Revised June 29, 2005

A normalized fine grain carbon low alloy steel, P355NL1 (TStE355), intended for service in welded pressure vessels, where notch toughness is of high importance, has been investigated. Low and high cycle fatigue tests have been conducted on several series of smooth specimens under both strain and stress control. The monotonic and cyclic elasto-plastic behavior of the material is characterized and described using relations available in the literature. The shape of hysteresis loops are conveniently modeled, taking into account the observed non Masing behavior of the steel. Some important cyclic phenomena, observed for the studied steel, such as the cyclic creep and the cyclic stress relaxation, are illustrated. Strain, stress, and energy based relations for fatigue life prediction until crack initiation, are evaluated based on experimental results. The adequacy of several rules for damage accumulation is also investigated. Finally, along the paper, some comparisons are performed between the cyclic elasto-plastic and fatigue behaviors of the steels P355NL1 and ASTM A516 Gr. 70.

Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical microstructure of the P355NL1 steel (magnification: 500×, etchant: Nital 2%)

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Figure 2

Geometry and dimensions of the specimen used in the fatigue tests (dimensions in mm)

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Figure 3

Stress amplitude versus the number of cycles for fully reversed strain-controlled tests (Rε=−1)

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Figure 4

Stress amplitude versus the number of cycles resulting from tests carried out under strain control with Rε=0

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Figure 5

Mean stress versus the number of cycles resulting from tests carried out under strain control with Rε=0

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Figure 6

Cyclic mean strain versus the number of cycles resulting from tests carried out under stress control with Rσ=−0.5

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Figure 7

Cyclic mean strain versus the number of cycles resulting from tests carried out under stress control with Rσ=0

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Figure 8

Monotonic and cyclic curves of the P355NL1 steel

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Figure 9

Illustration of the non-Masing type behavior of the steel P355NL1 based on fatigue tests carried out under strain control with Rε=−1

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Figure 10

Master curve obtained with tests carried out under strain control and Rε=−1

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Figure 11

Elastic, plastic, and total strain amplitude versus the number of reversals for fully reversed strain-controlled fatigue tests

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Figure 12

Total strain amplitude versus the number of reversals for fully reversed (Rε=−1) and tensile mean-strain (Rε=0) fatigue tests

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Figure 13

Stress-life curves for P355NL1 carbon low alloy steel, for stress ratios Rσ=0,Rσ=−0.5, and Rσ=−1

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Figure 14

Energy per cycle versus the number of reversals to failure of steel P355NL1

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Figure 15

Comparison between predictions and experimental data for two-stage loading

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