On The Mean Stress Correction in Fatigue Life Assessment in Cast Aluminum Alloys

Stress invariants approach to the multiaxial fatigue life estimation is generally based on the root mean square value of second invariant of the deviatoric stress amplitude and the value of hydrostatic stress. Such an approach omits a significant part of the information about multiaxial load history. It is particularly noticeable in case of non-proportional loadings, which lead to a reduction of fatigue life (i.e. [1–3]). In this work a new method based on the mean value of modified second invariant of the deviatoric stress has been presented.

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Fatigue life assessment of aluminum alloys with casting defects

Engineering Fracture Mechanics ◽

10.1016/0013-7944(93)90108-5 ◽

1993 ◽

Vol 44 (6) ◽

pp. 857-874 ◽

Cited By ~ 156

Author(s):

B. Skallerud ◽

T. Iveland ◽

G. Härkegård

Keyword(s):

Fatigue Life ◽

Aluminum Alloys ◽

Life Assessment ◽

Casting Defects ◽

Fatigue Life Assessment

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Fatigue Life Estimation with Mean Stress Effect Compensation for Lightweight Structures—The Case of GLARE 2 Composite

Polymers ◽

10.3390/polym12020251 ◽

2020 ◽

Vol 12 (2) ◽

pp. 251 ◽

Cited By ~ 2

Author(s):

Michał Böhm ◽

Karolina Głowacka

Keyword(s):

Fatigue Life ◽

Composite Structures ◽

Life Assessment ◽

Stress Effect ◽

Mean Stress ◽

Lightweight Structures ◽

Fatigue Life Assessment ◽

Current State ◽

Fatigue Life Estimation ◽

Material Information

This paper describes the current state-of-the-art in fatigue life assessment for lightweight composite structures with the use of the frequency domain fatigue life calculation method. Random stationary gaussian loading signals have been generated and served in the process of fatigue calculation. The material information that is being used in the calculation process has been obtained from literature for the Glare 2 composite. The effect of nonzero mean stress and different fiber orientations have been taken into account. The calculations have been performed for two mean stress compensation models by Goodman and Gerber. The proposed procedure gives satisfying results for the high-cycle fatigue region for Goodman and an overall good comparison in both regimes for the Gerber model.

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Mean Stress Effect Correction in Frequency-domain Methods for Fatigue Life Assessment

Procedia Engineering ◽

10.1016/j.proeng.2015.02.042 ◽

2015 ◽

Vol 101 ◽

pp. 347-354 ◽

Cited By ~ 9

Author(s):

Adam Niesłony ◽

Michał Böhm

Keyword(s):

Fatigue Life ◽

Frequency Domain ◽

Life Assessment ◽

Stress Effect ◽

Mean Stress ◽

Mean Stress Effect ◽

Fatigue Life Assessment ◽

Frequency Domain Methods

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Ductility–Fatigue Life Relationships in Aluminum Alloy Castings: Role of Structural Quality

Encyclopedia of Aluminum and Its Alloys ◽

10.1201/9781351045636-140000323 ◽

2019 ◽

Author(s):

Murat Tiryakioğlu ◽

Hüseyin Özdeş

Keyword(s):

Aluminum Alloy ◽

Fatigue Life ◽

Aluminum Alloys ◽

Tensile Properties ◽

Quality Factor ◽

Structural Quality ◽

Cast Aluminum ◽

Cast Aluminum Alloys ◽

Alloy Castings

The relationships between tensile properties and fatigue life in cast aluminum alloys have been reviewed. Strong relationships were found between fatigue life and the quality factor, QT, that uses tensile ductility to characterize structural quality for a number of cast aluminum alloys. The model developed by the authors to estimate the Basquin parameters as a function of QT is introduced along with a step-by-step guide on how to apply it to cast aluminum alloys. This model provides much more reliable estimates for cast aluminum alloys than other models available in the literature.

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