A damage gradient model for fatigue life prediction of notched metallic structures under multiaxial random vibrations

Luo, Zhengbo; Chen, Huaihai; Zheng, Ronghui; Wei, Zheng

doi:10.1111/ffe.13290

Cited by 14 publications

(17 citation statements)

References 39 publications

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“…In addition, biaxial random vibration environment fatigue tests available in the literature, 11,12 performed by using an equipment similar to that here employed, are also examined by means of the proposed procedure. Figure 11B displays the averaged experimental fatigue life T exp,ave plotted against the calculated one T cal .…”

Section: Evaluation Of Fatigue Lifementioning

confidence: 99%

“…Engineering structural components under in‐service conditions often experience complex random vibration environments 1–3 . Therefore, the vibration fatigue analysis of such components becomes an interesting research topic in the scientific community 4–12 …”

Section: Introductionmentioning

confidence: 99%

“…In the current research study, an extension of the time domain critical plane‐based Carpinteri et al criterion 30 is proposed for vibration fatigue analysis of circumferentially notched specimens under complex multiaxial stress states, implementing the point method in the above criterion. To experimentally achieve the above stress state, a novel testing equipment installed on a triaxial shaker table is designed by making some changes with respect to that described in Luo et al 11,12 …”

Section: Introductionmentioning

confidence: 99%

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Vibration fatigue analysis of circumferentially notched specimens under coupled multiaxial random vibration environments

Luo

Vantadori

Ronchei

et al. 2021

Fatigue Fract Eng Mat Struct

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The time domain critical plane‐based Carpinteri et al. criterion and the Theory of the Critical Distance are here combined together to propose a novel procedure for vibration fatigue analysis of circumferentially notched specimens subjected to coupled multiaxial random vibration environments. A novel metallic testing equipment is specially devised for notched specimens; meanwhile, a biaxial random vibration environment fatigue test is specially implemented on notched specimens in order to investigate how both coherence and phase shift between the auto‐spectral density functions in different directions influence the specimen fatigue life. The location of the verification point where to perform the fatigue damage estimation is determined by applying both the point method and the Carpinteri et al. criterion (for damage evaluation). The obtained results prove that the proposed procedure can provide satisfactory fatigue life estimations.

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Section: Evaluation Of Fatigue Lifementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vibration fatigue analysis of circumferentially notched specimens under coupled multiaxial random vibration environments

Luo

Vantadori

Ronchei

et al. 2021

Fatigue Fract Eng Mat Struct

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“…36 In recent times, then, TCD found application in random fatigue assessments. Luo et al 37,38 proposed a damage gradient model to estimate fatigue lives of notched metallic components subjected to random biaxial fatigue loadings. The model was further validated by experimental results.…”

Section: Applications Of Tcdmentioning

confidence: 99%

Theory of critical distances: A discussion on concepts and applications

Delprete

Maggio

Sesana

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Theory of Critical Distances (TCD) collects several methods adopted in failure prediction of components provided with stress concentration features. The idea of evaluating stress effect in a zone rather than in a single point was proposed decades ago but, only thanks to relatively recent works, TCD concepts showed to be a successful extension of Linear Elastic Fracture Mechanics (LEFM), able to assess strength and fatigue life. The increasing computational power has made Finite Element Method (FEM) widespread, hence stress fields can be easily extracted and used as input data for fatigue post-processing and durability analyses. In this scenario, TCD reveals as a powerful tool which, thanks to the introduction of a single material parameter (critical distance, [Formula: see text]), integrates classical fracture models by considering the presence of microscale phenomena acting in fracture process. In this sense, TCD behaves as a link between continuum mechanics and LEFM. Modalities and reasons for this connection to occur are interesting points of further investigations. Literature on TCD and its theoretical-experimental background is quite extended, nevertheless few industrial applications are available in literature to the best of authors’ knowledge. In this paper, an overview of concepts and applications related to TCD are reported highlighting the relevance of theoretical arguments in actual applications.

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“…36,37 There are many multiaxial fatigue data [38][39][40][41][42][43][44] on both smooth and notched specimens available in the research literature. Further, combined with the theory of critical distance (TCD), 45,46 both the proposed frequency-domain formulation and the time-domain formulation of the MWCM are applied to fatigue testing results [42][43][44] of 2024-T4 aluminum alloy notched specimens subjected to various nonproportional bending and/or torsional random vibration fatigue loading with zero mean value.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life calculation of notched specimens by modified Wöhler curve method and theory of critical distance under multiaxial random loading

Luo

Chen

Wang

et al. 2021

Fatigue Fract Eng Mat Struct

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Reformulation of a critical plane‐based multiaxial fatigue criterion named as Modified Wöhler Curve Method (MWCM) in the frequency domain is proposed; moreover, it is combined with the theory of critical distance (TCD) to implement vibration fatigue lifetime prediction of notched specimens subjected to complex multiaxial random loading. Firstly, a frequency‐domain formulation of the maximum variance method (MVM) is proposed for determining the critical plane with high computational efficiency. Then, a reference fatigue curve is defined through the frequency‐domain formulation of the reference stress ratio corresponding to the critical plane. Finally, the power spectral density (PSD) function of the resolved shear stress along the maximum variance direction is applied with the Bendat/Tovo–Benasciutti (TB) method to implement fatigue damage estimation of mechanical components. Both the time‐domain formulation and the proposed frequency‐domain formulation of the MWCM combined with the TCD are applied to the experimental results from the literature, concerning notched specimens made of 2024‐T4 aluminum alloy tested under various nonproportional bending‐torsion random vibration fatigue loading.

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A damage gradient model for fatigue life prediction of notched metallic structures under multiaxial random vibrations

Cited by 14 publications

References 39 publications

Vibration fatigue analysis of circumferentially notched specimens under coupled multiaxial random vibration environments

Vibration fatigue analysis of circumferentially notched specimens under coupled multiaxial random vibration environments

Theory of critical distances: A discussion on concepts and applications

Fatigue life calculation of notched specimens by modified Wöhler curve method and theory of critical distance under multiaxial random loading

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