Fatigue Resistance of Reinforcing Steel Bars

Kopas, Peter; Jakubovičová, Lenka; Vaško, Milan; Handrik, Marián

doi:10.1016/j.proeng.2016.01.196

Cited by 38 publications

(18 citation statements)

References 5 publications

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“…We can dispose either of experimental measured results or computer simulated data. Experimental data are processed using a regression analysis or a frequency distribution function is determined [5]. A selection of possible hypotheses is optional and it depends on a specific situation or on a philosophy of a fatigue damaging process.…”

Section: The Computational Scheme Of a Fatigue Life Predictionmentioning

confidence: 99%

“…The general procedure of life prediction from point of view of fatigue damage was based:  determination of the most significant working regimes and factors of typical working conditions from point of view of structure loads and their following activities [5][6][7],  identification of carrying structure critical parts and determination of their working loads,  analysis of choice material properties and estimate of effects of different types of notches, connections and nonlinearities in examined points of structure [8,9] and  application of suitable hypothesis of fatigue damage cumulation and quantification of predicted fatigue life of selected parts of carrying structure [10,11].…”

Section: Fatigue Life Prediction Of Crane Load-bearing Structurementioning

confidence: 99%

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Fatigue life prediction of mechanical structures under stochastic loading

Leitner

Figuli

2018

MATEC Web Conf.

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Abstract. Problems of fatigue life prediction of materials and structures are discussed in the paper. Service loading is assumed as a continuous loading process with possible discontinuous events, which are caused by various operating conditions. The damage in a material is due to a cumulative degradation process. The damaging process is then represented either by rain-flow matrices or by a fatigue damage function which is derived using some hypothesis of a fatigue failure criterion. Presented theoretical procedure enables a very effective estimation of a service life and/or reliable evaluation of residual life of any structures under various types of loading and environmental conditions. This approach creates a good basis for powerful expert systems in structural and mechanical engineering. The aim of the paper is to present briefly some results of analysis of load-bearing steel structure loads of special railway crane PKP 25/20i which was utilized in some specific ad relatively hard operating conditions. Virtual models of the structure were being used in an analysis of acting working dynamics loads influence to be able to forecast fatigue life of load-bearing of the crane jib.

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Section: The Computational Scheme Of a Fatigue Life Predictionmentioning

confidence: 99%

Section: Fatigue Life Prediction Of Crane Load-bearing Structurementioning

confidence: 99%

Fatigue life prediction of mechanical structures under stochastic loading

Leitner

Figuli

2018

MATEC Web Conf.

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“…The robustness of the procedure is based on the vectorization, which is incorporated in Matlab ® software. The wavenumber vector, through which were computed the values of the left-hand side of dispersion equations ranged from zero to , where: (15) where is maximum angular frequency within the computed frequency interval. The incremental step of wavenumber interval is equal to: Resulting dispersion curves in terms of phase velocity as a function of frequency and wavenumber as a function of frequency respectively are displayed in Fig.…”

Section: Numerical Solution For Real Wavenumbersmentioning

confidence: 99%

Numerical solution of Rayleigh-Lamb frequency equation for real, imaginary and complex wavenumbers

2018

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Abstract. Guided waves, especially Lamb waves or shear-horizontal waves, are widely used types of waves for ultrasonic inspection of large structures. Well known property of guided waves is their dispersive character, which means that the propagation velocity of the particular wave mode is not only a function of physical properties of the material, in which the wave propagates or the wave´s frequency, but also depends on the geometry of the structure in itself. Dispersion curves provide us the information related to the dependency between the wavenumber and the frequency of the particular mode and can be obtained by a numerical solution of Rayleigh-Lamb frequency equation. A solution of Rayleigh-Lamb frequency equation forms for a given frequency and plate thickness a set of a finite number of real and pure imaginary wavenumbers and an infinite number of complex wavenumbers. Proposed paper presents a complete procedure of how to obtain all three kinds of wavenumbers for a given geometry and frequency interval. The main emphasis is placed on the effectiveness of the procedures, which are used for finding the roots of dispersion equation for all three kinds of wavenumbers.

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“…It is used both for the preparation of semi-finished products and cutting of metal parts either for final use or as preparation for other technological operations [1,2]. Simple analytical calculations are usually used during preparation of serial manufacturing [3,4]. These analytical calculations are sufficient for determining basic parameters of blanking process such as maximal blanking force, however when problems occur during the manufacturing process the solution is often complicated and can be calculated only by using advanced numerical methods [5].…”

Section: Introductionmentioning

confidence: 99%