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Research Papers

A Simple and Efficient Reformulation of the Classical Manson–Coffin Curve to Predict Lifetime Under Multiaxial Fatigue Loading—Part I: Plain Materials

[+] Author and Article Information
Luca Susmel

Department of Engineering, University of Ferrara, Via Saragat, 1 44100 Ferrara Italy

Giovanni Meneghetti, Bruno Atzori

Department of Mechanical Engineering, University of Padova, Via Venezia, 1 35100 Padova Italy

J. Eng. Mater. Technol 131(2), 021009 (Mar 09, 2009) (9 pages) doi:10.1115/1.3078300 History: Received July 01, 2008; Revised December 05, 2008; Published March 09, 2009

This paper summarizes an attempt to devise an engineering method suitable for predicting fatigue lifetime of metallic materials subjected to both proportional and nonproportional multiaxial cyclic loadings. The proposed approach takes as a starting point the assumption that the plane experiencing the maximum shear strain amplitude (the so-called “critical plane”) is coincident with the micro-/mesocrack initiation plane. In order to correctly account for the presence of both nonzero mean stresses and nonzero out-of-phase angles, the degree of multiaxiality/nonproportionality of the stress state damaging crack initiation sites is suggested here to be evaluated in terms of the ratio between maximum normal stress and shear stress amplitude relative to the critical plane. Such a ratio is used then to define nonconventional Manson–Coffin curves, whose calibration is done through two strain-life curves generated under fully reversed uniaxial and fully reversed torsional fatigue loadings, respectively. The accuracy and reliability of our approach were systematically checked by using approximately 350 experimental data taken from the technical literature and generated by testing 13 different materials under both in-phase and out-of-phase loadings. Moreover, the accuracy of our criterion in estimating lifetime in the presence of nonzero mean stresses was also investigated. Such an extensive validation exercise allowed us to prove that the fatigue life estimation technique formalized in the present paper is a reliable tool capable of correctly evaluating fatigue damage in engineering materials subjected to multiaxial cyclic loading paths.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cylindrical plain specimen and adopted system of coordinates (a), Mohr’s circles under fully reversed torsional, (a) and (c), and uniaxial, (b) and (e), fatigue loadings

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Figure 2

Modified Wöhler diagram

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Figure 3

In-field use of the MWCM

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Figure 4

Modified Manson–Coffin diagram

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Figure 5

Fatigue damage model

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Figure 6

In-field use of the MMCCM

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Figure 7

Accuracy of Manson–Coffin’s approach in estimating fatigue lifetime under fully reversed uniaxial and torsional fatigue loadings

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Figure 8

MMCCM’s accuracy in estimating the lifetime of the investigated materials under multiaxial fatigue loading

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