A Probabilistic-Statistical Model of Durability of Parts Under Cyclic Loading

Ламнауэр, Наталия Юрьевна; Kupriyanov, Oleksandr; Скоркін, Антон Олегович; Kondratyuk, O.

doi:10.1007/978-3-030-50794-7_28

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…For this model, the squared asymmetry is a function of the two variables, and has the following form [6,21]:…”

Section: = +mentioning

confidence: 99%

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The Service Life Prediction for Brake Pads of Freight Wagons

Panchenko,

Gerlici,

Lovska

et al. 2024

Communications

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The analysis of the statistical values of wear of brake pads in operation, based on which a wear model was developed, is presented in this paper. This model can be used for predicting the remaining service life of brake pads according to the wagon mileage. The distribution function of wear on the upper and lower parts of the pad was determined, which made it possible to find the main qualitative characteristics, namely, the wear intensity, the c -percentage wear, and the average pad wear at a specified wagon mileage. The results of the study can be factored for solving complex engineering problems of excessive wear of composite brake pads used for freight rolling stock; they could also help to extend the guaranteed overhaul period and improve the railway traffic safety.

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“…For this model, the squared asymmetry is a function of the two variables, and has the following form [6,21]:…”

Section: = +mentioning

confidence: 99%

“…The wear values on the top and bottom of the pad in operation at the wagon mileages from 0 to 197,800 km were found; the number of tests that formed the sample size was n =106. The optimal number of intervals is adopted from the studies highlighted in the work [21]. With a sample size of n =106, the number l = 5 is taken.…”

Section: Introductionmentioning

confidence: 99%

The Service Life Prediction for Brake Pads of Freight Wagons

Panchenko,

Gerlici,

Lovska

et al. 2024

Communications

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show abstract

“…The obtained results demonstrated good agreement between the predicted fatigue lives of the proposed probabilistic model and the measured strain fatigue life models. Lamnauer et al [16] suggested the use of a probabilistic statistical model for calculating the strength of parts under cyclic fatigue loads. Statistical analysis of the samples (the average value, the corrected variance, the squared asymmetry coefficient, and the excess coefficient) was carried out according to the results of a mass experiment on the strength of samples during fatigue tests.…”

Section: Introductionmentioning

confidence: 99%

Probability Assessment of the Mechanical and Low-Cycle Properties of Structural Steels and Aluminium

Bazaras

Lukoševičius

Vilkauskas

et al. 2021

Metals

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Key mechanical properties used in low-cycle strength and durability calculations are the strength (proportional limit stress, σpr; relative yield strength, σ0.2; and ultimate tensile stress, σu) and strain properties (proportional limit strain, epr; percent area reduction, ψ; and percent area reduction at failure, ψu). When selecting the key mechanical properties provided in the specifications, an error may be made due to the failure to account for a series of random factors that determine the distribution of properties. The majority of research papers dealing with statistical descriptions of the low-cycle strain properties do not look deeper into the distribution of mechanical properties and the diagram parameters of strain characteristics. This paper provides a description of the distribution patterns of mechanical properties, statistical parameters, and low-cycle fatigue curves. Log-normal distribution generated the lowest values for the coefficient of variation of one of the key statistical indicators, suggesting that log-normal distribution is superior to normal or Weibull distribution in this respect. The distribution of low-cycle strain parameters exceeded the distribution of mechanical properties considerably. Minimum coefficients of variation of the parameters were generated at normal distribution. The statistical analysis showed the lower distribution of the durability parameters compared to the distribution of parameters of the strain diagrams. The findings of the paper enable a revision of the durability and life of the structural elements of in-service facilities subject to elastoplastic loading by assessing the distribution of mechanical characteristics and low-cycle strain parameters as well as the permissible distribution limits.

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Resource Estimation of Freight Car’s Brake Pads in Operating Conditions

Равлюк¹,

Ламнауер²,

ЕЛЯЗОВ³

et al. 2021

STP

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Purpose. This research is aimed at substantiation and development of the correct for practical use model of service life exhaustion of brake pads of freight cars based on mass inspections of their wear using the elements of the statistical conclusions’ theory. Methodology. Production research conducted in several stages, allowed identifying and accumulating sufficient statistics on the malfunctions, failures or defects of the elements of the brake rigging. Statistics on determining the service life of composite brake pads before their complete failure were carried out for a typical and modernized design of the brake rigging of freight cars. The well-known provisions of the theory of statistical conclusions, which are applied to technical brake systems of units and elements of freight cars, were used as research methods. Findings. Empirical characteristics are obtained as a result of current inspections of wear of composite brake pads of brake rigging. This made it possible to achieve more reliable results from the law of random variables distribution concerning the wear of composite brake pads – to limit the service life of pads on the run under conditions of their safe operation. The proposed model of the density distribution function of random variables for composite brake pads allows high accuracy estimating such an important characteristic as the resource threshold. This make it possible to predict the brake pads performance and determine the efficiency of brake rigging of freight car bogies. Originality. For the first time, a correct statistical wear model of composite brake pads of freight cars has been proposed. Based on the developed model the occurrence chronology of clinodual wear of composite brake pads and its influence on a resource of their work in operating conditions is investigated. Field research on experimental bogies of freight cars confirmed that the service life of composite pads has increased by an average of 19% for upgraded brake rigging compared to typical ones. Practical value. The obtained positive results will be taken into account in the future to solve problematic technical issues related to non-standard wear of composite brake pads in the freight cars’ bogies of Ukrzaliznytsia JSC, which will allow extending the interrepair periods.

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A Probabilistic-Statistical Model of Durability of Parts Under Cyclic Loading

Cited by 3 publications

References 8 publications

The Service Life Prediction for Brake Pads of Freight Wagons

The Service Life Prediction for Brake Pads of Freight Wagons

Probability Assessment of the Mechanical and Low-Cycle Properties of Structural Steels and Aluminium

Resource Estimation of Freight Car’s Brake Pads in Operating Conditions

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