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Research Papers: Materials and Fabrication

Analysis of Variable Amplitude Fatigue Data of the P355NL1 Steel Using the Effective Strain Damage Model

[+] Author and Article Information
Hélder F. S. G. Pereira

UCVE,  IDMEC–Pólo FEUP, Campus da FEUP, Rua Dr. Roberto Frias, 404, 4200-465 Porto, Portugalhfpereira@portugalmail.pt

David L. DuQuesnay

Department of Mechanical Engineering, Royal Military College of Canada, P.O. Box 17000 Station Forces, Kingston, ON, Canadaduquesnay-d@rmc.ca

Abílio M. P. De Jesus

Engineering Department, Mechanical Engineering, University of Trás-os-Montes and Alto Douro, Quinta de Prados, 5001-801 Vila Real, Portugalajesus@utad.pt

António L. L. Silva

Engineering Department, Mechanical Engineering, University of Trás-os-Montes and Alto Douro, Quinta de Prados, 5001-801 Vila Real, Portugala.luis.l.silva@gmail.com

J. Pressure Vessel Technol 131(5), 051402 (Jul 27, 2009) (10 pages) doi:10.1115/1.3147986 History: Received July 30, 2008; Revised April 09, 2009; Published July 27, 2009

This paper proposes an analysis of variable amplitude fatigue data obtained for the P355NL1 steel, using a strain-based cumulative damage model. The fatigue data consist of constant and variable amplitude block loading, which was applied to both smooth and notched specimens, previously published by the authors. The strain-based cumulative damage model, which has been proposed by D.L. DuQuesnay, is based on the growth and closure mechanisms of microcracks. It incorporates a parameter termed net effective strain range, which is a function of the microcrack closure behavior and inherent ability to resist fatigue damage. A simplified version of the model is considered, which assumes crack closure at the lowest level for the entire spectrum and does not account for varying crack opening stresses. In general, the model produces conservative predictions within an accuracy range of two on lives, for both smooth and notched geometries, demonstrating the robustness of the model.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Crack opening versus crack closure stresses (11)

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Figure 2

Geometry of the smooth specimens (dimensions in millimeters)

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Figure 3

Geometry of the notched specimens (dimensions in millimeters)

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Figure 4

Two constant amplitude blocks applied to the smooth specimens

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Figure 5

Multiple alternated constant amplitude blocks applied to the smooth specimens

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Figure 6

Variable amplitude blocks applied to the smooth specimens (εmax=2.1%, R=0)

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Figure 7

Strain range distributions for the variable amplitude blocks applied to the smooth specimens: (a) maximum strain of 1.05%, average strain range of 0.55%, and standard deviation of 0.31%; and (b) maximum strain of 2.1%, average strain range of 1.1%, and standard deviation of 0.62%

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Figure 8

Variable amplitude blocks applied to the notched specimens (remote stress control)

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Figure 9

Effective strain range versus cycle data

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Figure 10

Net effective strain range versus cycle data

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Figure 11

Fatigue life predictions for smooth specimens under constant amplitude block loading

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Figure 12

Fatigue life predictions for smooth specimens under variable amplitude block loading

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Figure 13

Fatigue life predictions (S-N data) for notched specimens under constant amplitude loading

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Figure 14

Fatigue life predictions for notched specimens under constant amplitude block loading

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Figure 15

Fatigue life predictions for notched specimens under variable amplitude block loading

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