Non-Gaussianity and non-stationarity in vibration fatigue

Palmieri, Massimiliano; Česnik, Martin; Slavič, Janko; Cianetti, Filippo; Boltežar, Miha

doi:10.1016/j.ijfatigue.2016.12.017

Cited by 100 publications

(47 citation statements)

References 17 publications

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“…Based on these literatures, it was seen that the load component is a crucial part of fatigue life analysis where researchers attempted to determine the realistic loadings. The significance of loading signals was further investigated by Palmieri et al [7], where they proposed that the fatigue life was significantly affected by the stationarity and Gaussian properties. However, in the case of real vehicle applications, the loading signals are always non-stationary, which make the analysis complex [8].…”

Section: Introductionmentioning

confidence: 99%

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Kong

Abdullah

Schramm

et al. 2018

Metals

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This paper presents the evaluation of frequency-based approach predicted spring using acceleration signals that were collected from various road conditions. Random loadings in the forms of acceleration are nominal and more flexible for vehicle components fatigue assessment. In this analysis, the strain time history of the spring and acceleration signals of the suspension strut was measured from three different road conditions. The acceleration signals were then transformed into power spectra density (PSD). PSD cycle counter, like Lalanne, Dirlik, and narrow band approach, was applied to obtain equivalent load cycles. The stress response was obtained through having the equivalent load cycles with a spring modal frequency response function (FRF) and different stress criterion, like absolute maximum principal and critical plane approaches. Then, the stress response was used to predict the spring fatigue life using stress-life (S-N) approach. The results revealed that the harshest road condition was the rural road where the spring with fatigue life of 4.47 × 107 blocks to failure was obtained. The strain predicted fatigue life was used to validate the frequency-based predictions using a conservative approach. It was found that the Dirlik approach has shown the closest results to the strain life approach, which suggested that the Dirlik approach could be used for spring fatigue life prediction with the acceptable accuracy.

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Section: Introductionmentioning

confidence: 99%

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Kong

Abdullah

Schramm

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…At the same time, the test case affirms and confirms how much the system dynamics are important to modulate the input load conditions and to modify the statistical distribution of outputs respect to inputs one. 23 In the test case, authors reach a perfect correspondence between the damage potentially induced by the tests ring, designed by the proposed approach, or by its synthesis (represented by an equivalent PSD function), and the input proposed by the norm. But the real dynamics of the vehicle, used to excite the payload, modulates the excitation and does not allow to respect the frequency domain representation of the potential damage itself.…”

Section: Discussionmentioning

confidence: 88%

The design of durability tests by fatigue damage spectrum approach

Cianetti

Alvino²,

Bolognini³

et al. 2017

Fatigue Fract Eng Mat Struct

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In the present paper, a new approach to combine load conditions expressed by power spectral density functions and to synthesize them into an equivalent one was presented. This method is based on the concept of fatigue damage spectrum and on the system dynamics. It was developed to design or verify operative durability tests (i.e., tracks), able to test payloads transported by vehicles, which could be alternative to laboratory ones, defined by the norm. By analyzing the acceleration spectrum of the norm and the acceleration measurements (all expressed in terms of power spectral density functions) acquired on the designed tracks during an experimental activity conducted on a wheeled transport vehicle, it was possible to verify the goodness of the proposed approach.

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“…Spectral methods are currently being developed especially in terms of calculations for non-Gaussian loads [14,15]. However, the problem of taking into account the impact of local elastoplastic deformations on computational fatigue life in the spectral method remains.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Elastoplastic Strain on Fatigue Durability Determined with the Use of the Spectral Method

Böhm¹,

Kowalski²,

Niesłony³

2020

Materials

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The paper presents experimental static and fatigue tests results under random loading conditions for the bending of 0H18N9 steel. The experimental results were used in performing calculations, according to the theoretical assumptions of the spectral method of fatigue life assessment, including elastoplastic deformations. The presented solution extends the use of the spectral method for material fatigue life assessment, in terms of loading conditions, above Hooke’s law theorem. The work includes computational verification of the proposal to extend the applicability of the spectral method of determining fatigue life for the range of elastoplastic deformations. One of the aims of the proposed modification was to supplement the stress amplitudes used to calculate the probability density function of the power spectral density of the signal with correction, due to the plastic deformation and its use for notched elements. The authors have tested the method using four of the most popular probability density functions used in commercial software. The obtained results of comparisons between the experimental and calculation results show that the proposed algorithm, tested using the Dirlik, Benasciutti–Tovo, Lalanne, and Zhao–Baker models, does not overestimate fatigue life, which means that the calculations are on the safe side. The obtained results prove that the elastoplastic deformations can be applied within the frequency domain for fatigue life calculations.

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Non-Gaussianity and non-stationarity in vibration fatigue

Cited by 100 publications

References 17 publications

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

Vibration Fatigue Analysis of Carbon Steel Coil Spring under Various Road Excitations

The design of durability tests by fatigue damage spectrum approach

Influence of the Elastoplastic Strain on Fatigue Durability Determined with the Use of the Spectral Method

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