Some Results of Torsional Corrosion-Fatigue Tests of Large Test Pieces

Oe, Takuji; Ueta, Yasuo

doi:10.2534/jjasnaoe1952.1959.293

Journal of Zosen Kiokai

1959

DOI: 10.2534/jjasnaoe1952.1959.293

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Some Results of Torsional Corrosion-Fatigue Tests of Large Test Pieces

Takuji Oe¹,

Yasuo Ueta²

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A mechanistic approach to critical‐distance methods in notch fatigue

Taylor

2001

Fatigue Fract Eng Mat Struct

113

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One approach to the prediction of notch fatigue limits is the Neuber method in which stresses are averaged over a critical distance ahead of the notch. In recent years this theory has been updated by the discovery of an analytical method for finding the critical distance for a given material, which shows that the appropriate distance is 2ao , ao being El Haddad’s short‐crack constant. The present author has advocated this approach, which he has called the Line Method (LM) and has tested it extensively against experimental data. However the method still remains essentially empirical; the aim of the present paper was to try to link this approach to the known mechanisms of crack growth at a notch. It is proposed that the LM is successful because it expresses the conditions necessary for growth of a small crack located at the notch root. The argument is developed by starting from the resistance curves used to predict non‐propagating cracks and by linking the LM with the expression for stress intensity, K, derived by the crack‐line loading method. The results provide some mechanistic justification for the use of the LM for sharp, crack‐like notches; its success for other types of notch (i.e. blunt notches and short notches) requires a different explanation.

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A mechanistic approach to critical‐distance methods in notch fatigue

Taylor

2001

Fatigue Fract Eng Mat Struct

113

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A bi‐parametric Wöhler curve for high cycle multiaxial fatigue assessment

Susmel¹,

Lazzarin²

2002

Fatigue Fract Eng Mat Struct

261

226

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This paper presents a method for estimating high-cycle fatigue strength under multiaxial loading conditions. The physical interpretation of the fatigue damage is based on the theory of cyclic deformation in single crystals. Such a theory is also used to single out those stress components which can be considered significant for crack nucleation and growth in the so-called Stage I regime. Fatigue life estimates are carried out by means of a modified Wohler curve which can be applied to both smooth and blunt notched components, subjected to either in-phase or out-of-phase loads. The modified Wohler curve plots the fatigue strength in terms of the maximum macroscopic shear stress amplitudes, the reference plane - where such amplitudes have to be evaluated - being thought of as coincident with the fatigue microcrack initiation plane. The position of the fatigue strength curve also depends on the stress component normal to such a plane and the phase angle as well. About 450 experimental data taken from the literature are used to check the accuracy of the method under multiaxial fatigue conditions

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Some Results of Torsional Corrosion-Fatigue Tests of Large Test Pieces

Cited by 2 publications

References 0 publications

A mechanistic approach to critical‐distance methods in notch fatigue

A mechanistic approach to critical‐distance methods in notch fatigue

A bi‐parametric Wöhler curve for high cycle multiaxial fatigue assessment

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