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Journal ArticleDOI

Multiaxial fatigue life prediction of a high temperature steam turbine rotor using a critical plane approach

01 Oct 2000-Engineering Failure Analysis (Pergamon)-Vol. 7, Iss: 5, pp 347-358
Abstract: This paper deals with the problem of multiaxial fatigue life assessment of engineering components. A computer-based procedure for multiaxial fatigue life assessment incorporating critical plane multiaxial damage models, suitable for use in design evaluations of engineering components based on finite element analysis results, is presented and applied to correlate results from tests conducted on SAE 1045 steel notched shaft specimens. The results from the two variants of critical plane models are compared vis-a-vis the results from the conventional local strain based life prediction method. Fatigue life prediction of a high temperature steam turbine rotor is also carried out using the above procedure. more

Topics: Vibration fatigue (61%)
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Journal ArticleDOI
Aleksander Karolczuk1, E. Macha1Institutions (1)
Abstract: The paper presents a review of multiaxial fatigue failure criteria based on the critical plane concept. The criteria have been divided into three groups, according to the fatigue damage parameter used in the criterion, i.e. (i) stress, (ii) strain and (iii) strain energy density criteria. Each criterion was described mainly by the critical plane orientation. Multiaxial fatigue criteria based on the critical plane concept usually apply different loading parameters in the critical plane whose orientation is determined by (a) only shear loading parameters (crack Mode II or III), (b) only normal loading parameters (crack Mode I) or sometimes (c) mixed loading parameters (mixed crack Mode). There are also criteria based on few critical plane orientations and criteria based on critical plane orientations determined by a weighted averaging process of rotating principal stress axes. more

258 citations

Cites methods from "Multiaxial fatigue life prediction ..."

  • ...This approach is used in a few multiaxial fatigue criteria ( Das and Sivakumar, 1999, 2000; Zolochevsky, 2000)....


  • ...−− Cyclic, non-proportional (Socie, 1987; Das and Sivakumar, 2000 *) +...


Journal ArticleDOI
Jingran Ge1, Yi Sun1, Song Zhou1Institutions (1)
Abstract: In this paper, the frequency domain formula of equivalent Lemaitre stress taking into account the hydrostatic stress effect is first introduced, and the corresponding method for estimating fatigue life under multiaxial random loading is developed based on multiaxial S–N curve. The proposed method is systematically validated with the random bending-torsion fatigue tests and numerical simulations. It has been shown that the hydrostatic stress has a significant influence on multiaxial fatigue life; the results predicted by the proposed method agree well with the experiment, and are more accurate than those obtained for the equivalent von Mises stress method. more

31 citations

Journal ArticleDOI
Abstract: The present study intends to assess the fatigue damage of un-notched and notched components using a newly developed energy-based critical plane fatigue damage parameter The parameter integrates the normal and shear energies calculated on the critical plane on which the stress and strain Mohr's circles are the largest during the loading and unloading parts of a cycle For notched fatigue data, Neuber's analysis has been used to calculate the local stress and strain components at the notch root The developed fatigue damage approach is used to predict the fatigue life of notched and un-notched components made of Haynes 188, 1045 steel, 4340 steel, 1020 HR sheet steel, high strength steel, aluminum alloys 2024-T3 and 7075-T6 subjected to tension, torsion and tension-torsion loading conditions The predicted fatigue lives were found in very good agreement with the experimental fatigue life reported in the literature more

28 citations

Journal ArticleDOI
Baozhong Wang1, Wantang Fu1, Zhiqing Lv1, Ping Jiang1  +2 moreInstitutions (1)
Abstract: The hot deformation behavior of a 12%Cr ultra-super-critical rotor steel was investigated through compression test using Gleeble-3500 thermal–mechanical simulator within the temperature range of 1173–1473 K and the strain rate range of 0.01–10 s−1, and the corresponding flow curves were determined. The results showed that the flow stress and the peak strain increase with the drop in the deformation temperature and the rise in the strain rate. The critical Z value, below which the complete dynamic recrystallization may occur, is 3.53 × 1017. The hot deformation activation energy of the steel is 439 kJ/mol, and the hot deformation equation is e˙=1.773×1015[sinh(ασp)]4.420exp−439,000RT. For the convenience of the practical application, the regressed peak stress can be described as σp=16.7lne˙+881,802T−507.3. more

25 citations

Journal ArticleDOI
Aleksander Karolczuk1Institutions (1)
Abstract: Round cross-section specimens made of 18G2A steel were subjected to different combinations of constant- and variable-amplitude bending and torsion. The fatigue tests were performed under bending and torsion with moment control in the high cycle fatigue regime. Two approaches were used to calculate stress courses from moment histories. In one approach, stresses and strains were computed using simple elastic beam theory (nominal stresses). In the other approach, time courses of moments were used to calculate stress and strain histories taking into account plastic strains and non-linear stress distribution along the specimen cross-section on the basis of the algorithm described in the paper. The loading histories computed according the two methods were used to calculate the critical plane orientations. It was assumed that the orientation of the critical plane is controlled only by shear or tensile fatigue mechanism. Moreover, the theoretical critical plane positions were compared to the experimental macroscopic fatigue fracture plane orientations. more

21 citations

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Journal Article
01 Jan 1970-Journal: Materials

1,426 citations

Journal ArticleDOI
Ali Fatemi1, Darrell F. Socie2Institutions (2)
Abstract: — A modification to Brown and Miller's critical plane approach is proposed to predict multiaxial fatigue life under both in-phase and out-of-phase loading conditions. The components of this modified parameter consist of the maximum shear strain amplitude and the maximum normal stress on the maximum shear strain amplitude plane. Additional cyclic hardening developed during out-of-phase loading is included in the normal stress term. Also, the mathematical formulation of this new parameter is such that variable amplitude loading can be accommodated. Experimental results from tubular specimens made of 1045 HR steel under in-phase and 90° out-of-phase axial-torsional straining using both sinusoidal and trapezoidal wave forms were correlated within a factor of about two employing this approach. Available Inconel 718 axial-torsional data including mean strain histories were also satisfactorily correlated using the aforementioned parameter. more

1,291 citations

Journal ArticleDOI
Bong-Ryul You1, Soon-Bok Lee1Institutions (1)
Abstract: Multiaxial fatigue analysis is categorized into five viewpoints, i.e. empriical formulas and modifications of the Coffin-Manson equation, application of stress or strain invariants, use of the space averages of stress or strain, critical plane approaches, and use of energy which has accumulated on the materials. Garud 1 (J. Test. Evaluations 1981, 9 , 165) reviewed the results of multiaxial fatigue researches proposed up to 1980 in chronological order and evaluated them. In this paper multiaxial fatigue researches which have been suggested after 1980 were classified into the five viewpoints and some problems which existed in those studies were examined. During these periods major progresses in multiaxial fatigue analysis are the consideration of anisotropy of materials and the suggestion of the energy method using Mohr's circles. Additionally, existing equations or parameters were modified to consider the mean stress, loading path, etc. There have also been some trials for the generalization of the existing theories. more

305 citations

Book ChapterDOI
Darrell F. Socie1Institutions (1)
01 Jan 1993-

237 citations

01 Jan 1992-

96 citations

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