Variable Amplitude Fatigue Life in VHCF and Probabilistic Life Predictions

Arcari, Attilio; Apetre, Nicole; Dowling, N. E.; Meischel, Martin; Stanzl-Tschegg, Stefanie E.; Iyyer, Nagaraja; Phan, Nam

doi:10.1016/j.proeng.2015.08.107

Cited by 13 publications

(15 citation statements)

References 12 publications

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“…The combination of three models of fatigue resistance allows not only to locate accurately the LDF, but also to solve the problem of very high cycle fatigue [15,16]. For this region it is difficult to establish experimentally the limits of endurance.…”

Section: The Second Basic Relationship Combining the Results Of Fatimentioning

confidence: 99%

Fatigue Resistance Models of Structural for Risk Based Inspection

Belodedenko¹,

Hanush²,

Baglay³

et al. 2020

Civ Eng J

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The current stage of civil engineering is characterized by special attention to the safety of structures with a long service life. Such objects were designed several decades ago and their safe operation was ensured by significant safety margins. Now this approach to safety has been replaced by the concept of acceptable risk. It forms the basis of a risk based inspection (RBI) maintenance strategy. The transition from preventive maintenance strategies to a technical condition maintenance is substantiated. Complex indicators of technical condition, suitable for RBI- maintenance, are considered. The methodology of the resource safety index (RSI) is proposed. The latter is used as an indicator of risk. Special models of fatigue resistance is required for its control. The purpose of this paper is to build fatigue models for critical structural elements that are serviced according to the RBI concept. Instead of the traditional S-N curve, the lifetime general equation (first model) be used, where by the arguments are the main influence factors. Along with this, a modified ε - N equation is proposed for deformation criteria. The novelty of this equation is that it uses the rate of S-N- curve (slope) obtained in the first model with high cycle fatigue. The second model, combining the results of fatigue tests, is the equation for the dispersion of durability. The third model is the accumulated damage function under overloads. The efficiency of the RSI method is demonstrated by the example of the reliability assessment of the high strength bolts. Thanks to RSI method forecasting, during RBI-maintenance, parts can be used 3-5 times longer than with traditional methods.

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Section: The Second Basic Relationship Combining the Results Of Fatimentioning

confidence: 99%

Fatigue Resistance Models of Structural for Risk Based Inspection

Belodedenko¹,

Hanush²,

Baglay³

et al. 2020

Civ Eng J

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“…Therefore, more efforts should be made to model the dependence of the fatigue on the defect size. The influence of the mean stress, or the stress F I G U R E 2 0 Validation of the model for the VHCF life in Arcari et al 72 : Walker strain parameter with respect to N f (reprinted with permission from Elsevier) [Colour figure can be viewed at wileyonlinelibrary.com] ratio, is not considered in the analyzed models, apart from in Arcari et al 72 This shortcoming must, necessarily, be addressed in future research to extend the range of application of models based on a probabilistic approach.…”

Section: Lcf-vhcf Life Range and Duplex P-s-n Curves: Probabilistic A...mentioning

confidence: 99%

“…85 . The model in Arcari et al 72 focused on the assessment of the strain-life response of materials. All the models within this group have been validated experimentally mainly on a high-strength steel, proving their effectiveness.…”

Section: Summary and Considerations On Fatigue Designmentioning

confidence: 99%

Statistical models for estimating the fatigue life, the stress–life relation, and the P‐S–N curves of metallic materials in Very High Cycle Fatigue: A review

Tridello

Niutta

Rossetto

et al. 2021

Fatigue Fract Eng Mat Struct

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The research on the Very High Cycle Fatigue (VHCF) response of materials is fundamental to guarantee a safe design of structural components. Researchers develop models for the fatigue life in VHCF, aiming at assessing the stress–life relation and, accordingly, the probabilistic S–N (P‐S–N) curves. In the paper, the models for the stress–life relation in VHCF are comprehensively reviewed. The models are classified according to the approach followed for defining the stress–life dependency, that is, power law, probabilistic, fracture mechanics, or Paris law‐based approach. The number of failure modes that can be modeled, the statistical distribution for the fatigue life, and the characteristics of the estimated P‐S–N curves are also reviewed by analyzing the fitting capability of experimental datasets for each model. This review is supposed to highlight the strengths and weaknesses of the currently available models and guide the future research.

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“…In another study, the fatigue behaviors of aluminum AA7075‐T651 was modeled. A mean stress correction‐based method was developed for predicting the crack propagation and fatigue life under a very high cycle variable amplitude loading . In addition to the mean stress‐dependent approach, a time‐based subcycle formulation was developed for predicting fatigue crack growth and crack tip opening displacement under random variable loadings .…”

Section: Introductionmentioning

confidence: 99%

“…A mean stress correctionbased method was developed for predicting the crack propagation and fatigue life under a very high cycle variable amplitude loading. 16 In addition to the mean stress-dependent approach, a time-based subcycle formulation was developed for predicting fatigue crack growth and crack tip opening displacement under random variable loadings. 17 The formulation was then validated with existing data in the literature and showed impressive capabilities for predicting crack propagation under constant amplitude load with repeated spike overload, spike overload-underload, and continuous overloadunderload.…”

Section: Introductionmentioning

confidence: 99%

An online‐offline prognosis model for fatigue life prediction under biaxial cyclic loading with overloads

Datta

Chattopadhyay

et al. 2019

Fatigue Fract Eng Mat Struct

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This paper presents a robust online‐offline model for the prediction of crack propagation under complex in‐phase biaxial fatigue loading in the presence of overloads of different magnitudes. The online prognosis model comprises a combination of finite element analysis and data‐driven regression to predict the crack propagation under constant loading, while the offline model is trained using experimental data to inform the post‐overload crack growth retardation behavior to the online model. The developed methodology is validated by conducting biaxial fatigue experiments using aluminum AA7075‐T651 alloy cruciform specimens. A close correlation is observed between the experimental results and model predictions. The results show that the model successfully predicts the crack retardation behavior under the influence of overloads with different magnitudes occurring at different stages of fatigue crack growth. Error analysis is conducted to investigate the sensitivities of the number of training points and crack increments to the prediction accuracy. In addition, the error propagation with respect to the crack length is studied, which provides constructive suggestions for further model improvement.

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Variable Amplitude Fatigue Life in VHCF and Probabilistic Life Predictions

Cited by 13 publications

References 12 publications

Fatigue Resistance Models of Structural for Risk Based Inspection

Fatigue Resistance Models of Structural for Risk Based Inspection

Statistical models for estimating the fatigue life, the stress–life relation, and the P‐S–N curves of metallic materials in Very High Cycle Fatigue: A review

An online‐offline prognosis model for fatigue life prediction under biaxial cyclic loading with overloads

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