Parametric probabilistic approach for cumulative fatigue damage using double linear damage rule considering limited data

Dias, João Paulo; Ekwaro-Osire, Stephen; Cunha, Americo; Dabetwar, Shweta; Nispel, Abraham; Alemayehu, Fisseha M.; Endeshaw, Haileyesus B.

doi:10.1016/j.ijfatigue.2019.06.011

Cited by 34 publications

(11 citation statements)

References 26 publications

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“…However, in all experiments the total damage was greater than 1.0, verifying the implicit conservatism in BS EN 1999-1-3 [26]. Alternative damage accumulation methods have been developed and proposed such as nonlinear damage accumulation proposed by Zhu et al [30] or Dias et al [31].…”

Section: Fatigue Experimentsmentioning

confidence: 67%

Dynamic crack propagation in specimens with a surface irregularity

et al. 2020

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Initiation of cracks and their propagation in prescribed orientations on tubular specimens has been made possible on a dynamic fatigue testing rig developed at the University of Aberdeen. This rig was originally designed to perform experiments on single edge notched beams (SENB) [1,2]. Modifications have recently been made so as to accommodate experimental tests on tubular specimens with a range of sizes and other cross sections. Crack initiation at grooves on such specimens has been followed by crack growth. At the same time, lateral oscillations of cracked specimen have been measured, as well as accelerations of base excitation, masses above and below cracked specimen. Forces on these two masses have been observed by two load cells attached at positions close to specimen. These load cells facilitated the measurement of stresses in experiment. Crack length time histories have also been constructed by applying an alternating current potential difference (ACPD) method. Fatigue cracks were initiated at the pre-cut grooves in aluminium tubular specimens. Three specimens with different groove sizes were tested in fifteen individual experiments. A three-dimensional Finite Element model was established for each specimen so as to calculate the stress concentration factor (SCF). This formed the basis of determining the amplitude of forcing input made possible by an electromechanical shaker. The phase shifts of acquired time histories has provided some indication of energy transfer mechanism during fatigue and system dynamic response. Observations of cracked specimen displacement during experiments was compared against calculated displacement from elastic theory. Nonlinear responses were observed, suggesting nonlinear stiffness characteristics of the specimen due to discontinuities introduced by crack growth and plasticity effects. Comparison of damage combinations in experimental observation was made with predictions from BS EN 1999-1-3. All experimental observations of total damage combination were higher than predicted values by the latter code.

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Section: Fatigue Experimentsmentioning

confidence: 67%

Dynamic crack propagation in specimens with a surface irregularity

et al. 2020

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“…where ( ) and for = 0,1, … , are known real functions and values, respectively with 0 ( ) = 1 and 0 = 1. The maximization problem is solved using the Lagrange multipliers for = 0,1, … , as [12], [13]…”

Section: Uncertainty Quantification Schemementioning

confidence: 99%

“…The significance of a dataset is tested using the mean-square convergence criterion. This criterion, essentially, look at the convergence of the sample statistics (mean and standard deviation) at a certain number of samples , which is independent of the size of the dataset [13].…”

Section: Uncertainty Quantification Schemementioning

confidence: 99%

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Probabilistic Design and Uncertainty Quantification of the Structure of a Monopile Offshore Wind Turbine

Nispel

Ekwaro-Osire

Dias

et al. 2019

Volume 13: Safety Engineering, Risk, and Reliability Analysis

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Despite the increasing demand for offshore energy, structural components of offshore wind turbines (OWT), such as the tower and foundation, are considered the most critical parts of the turbine. In fact, uncertainties regarding load conditions, soil and structural properties highly undermine the OWT structural reliability. In this scenario, in order to obtain more accurate results, rigorous probabilistic analyses are necessary. In this study, a probabilistic analysis of the dynamic response of a monopile OWT is conducted by using a systematic uncertainty quantification (UQ) framework to deal with the uncertainty assessment of the model input parameters. The proposed dynamic model computes the dynamic response of the turbine due to wind and waves loads on the monopile structure utilizing a simple cantilever beam analytical model. The distributions of the model input parameters are determined using (1) nonparametric statistics for a large dataset, and (2) the maximum entropy principle for a small dataset. Monte Carlo simulations are performed to propagate the uncertainties of the model inputs and to determine the system reliability expressed in terms of their probability of failure for the serviceability limit state design criterion. Finally, to demonstrate the shortcomings of traditional approaches that assume standard distributions to model uncertainties, a UQ approach modeling the uncertainties of the parameters using normal distributions is contrasted with our framework. From the results, significant differences between the distribution shape and values of the probability of failure can be observed; thus, it demonstrates the importance of developing probabilistic frameworks with systematic UQ to have more realistic approximations of the reliability of the OWT structure.

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“…To a lesser extent, the model was used to assess the life cycle of building elements in research works V. Bolotin, V. Chirkov. Obviously, to use the model it is necessary to have a reliable estimate of the number of load cycles, that is, to predict the service durability it is necessary to have full load history data [2,3,4]. As for the elements of highway bridges and other elements of structures, the required data is determined so approximately that the reliability of the model is lost.…”

Section: Introductionmentioning

confidence: 99%

Problem of the degradation criteria for transportation construction elements

2020

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The article is devoted to the pressing problem of managing the reliability and durability of transport constructions. Modern scientific approaches to assessing the technical condition of transport facilities based on an analysis of element degradation during the life cycle of operation considered. The article presents the advantages and disadvantages of the most common prediction models of the technical condition of building structures. Each model uses a characteristic criterion for degradation of building structures: load and unload cycles, rejection number of chlorides, intensity coefficient, a geometric parameter (parameters) of the crack in the material, reliability, etc. The problem of choosing the control parameter of the lifecycle model of the bridge elements is analyzed. The theoretical basis for the Markov phenomenological model of damage accumulation and the model of degradation based on the physical and mechanical characteristics of the material formulated. Depending on the stage of the life cycle, it is proposed to select the type of prediction model.

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Parametric probabilistic approach for cumulative fatigue damage using double linear damage rule considering limited data

Cited by 34 publications

References 26 publications

Dynamic crack propagation in specimens with a surface irregularity

Dynamic crack propagation in specimens with a surface irregularity

Probabilistic Design and Uncertainty Quantification of the Structure of a Monopile Offshore Wind Turbine

Problem of the degradation criteria for transportation construction elements

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