Spectral methods for lifetime prediction under wide-band stationary random processes

Benasciutti, Denis; Tovo, R.

doi:10.1016/j.ijfatigue.2004.10.007

Cited by 311 publications

(207 citation statements)

References 12 publications

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“…(7) is exact, while in the wide-band case it is largely conservative and needs to be corrected by accounting for the actual PSD bandwidth [5,6]. A very simple approach is to introduce a correction factor ρ≤1 in Eq.…”

Section: Spectral Methods and Fatigue Lifementioning

confidence: 99%

“…In the narrow-band case ρ→1, while in the wide-band case ρ→0 (factor ρ then gives an indirect measure of the spectral width of a PSD). Several methods adopt such a correction factor approach, as the "TB method" [5,6]:…”

Section: Spectral Methods and Fatigue Lifementioning

confidence: 99%

“…where q=q(α 1 ,α 2 ) is a coefficient depending on α 1 ,α 2 (its analytical expression can be found in [5,6]). Other methods also exist (e.g.…”

Section: Spectral Methods and Fatigue Lifementioning

confidence: 99%

“…For the sake of simplicity, equations will be presented only for a biaxial stress, although the same formalism applies to a three-dimensional stress. Let x(t)=(σ xx (t),σ yy (t),τ xy (t)) be a biaxial stress (σ is normal stress, τ shear stress), characterised by the Hermitian PSD matrix: (5) in which the diagonal terms are auto-PSDs and the outof-diagonal terms are cross-PSDs (complex functions).…”

Section: Spectral Description Of Uniaxial and Multiaxial Random Stressesmentioning

confidence: 99%

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A bandwidth correction to the Allegri-Zhang solution for accelerated random vibration testing

2018

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Abstract. In 2008, Allegri and Zhang published a study [Int. J. Fatigue. 2008, 30(6):967-977] in which they provided an exact analytical solution to the inverse scaling law for accelerated vibration tests of linear systems submitted to stationary Gaussian excitations By combining finite element analysis with multiaxial spectral methods defined in the frequency-domain, their solution generalised the simple inverse power law model suggested in some standards. The solution adopted the "equivalent von Mises stress" multiaxial criterion combined with the narrow-band damage expression. This work aims to propose a bandwidth correction to the original Allegri-Zhang solution to account for the actual spectral bandwidth of the local multiaxial stress. The corrected Allegri-Zhang solution is also extended to another multiaxial spectral method, namely the "Projection-by-Projection" criterion. A numerical example is finally discussed, in which the corrected solution is applied to an L-shaped beam submitted to random accelerations.

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Section: Spectral Methods and Fatigue Lifementioning

confidence: 99%

Section: Spectral Methods and Fatigue Lifementioning

confidence: 99%

“…where q=q(α 1 ,α 2 ) is a coefficient depending on α 1 ,α 2 (its analytical expression can be found in [5,6]). Other methods also exist (e.g.…”

Section: Spectral Methods and Fatigue Lifementioning

confidence: 99%

Section: Spectral Description Of Uniaxial and Multiaxial Random Stressesmentioning

confidence: 99%

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A bandwidth correction to the Allegri-Zhang solution for accelerated random vibration testing

2018

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“…수정계수법은 협대역 스펙트럼의 피로손상도를 결정하는 Rayleigh방법 (Bendat, 1964)에 수정계수 를 곱하여 광대역 스펙트럼의 피로손상도를 평가하는 방법이다. 이 방법에는 Wirsching and light 모델 (Wirsching & light, 1980), Jiao-Moan 모델 (Jiao & Moan, 1990), Benasciutti-Tovo 모델 (Benasciutti & Tovo, 2005) …”

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A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum

Kim¹,

Lee²,

Choi³

2016

Journal of the Society of Naval Architects of Korea

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(Kim, et al., 2016;Baarholm, et al., 2006;Trim, et al., 2005)Oil and gas production riser systems need to be designed considering a wide band quarter-modal analysis which contains low-, wave-, VIV(Vortex induced vibration) frequencies. The VIV can be separated into cross-flow(CF) and in-line(IL) components. In this study, the various idealized tri-and quarter-modal spectra are suggested to analyze fatigue damage on the production riser system. In order to evaluate the fatigue damage increment caused by the IL's motion, tri-and quarter-modal spectral fatigue damages are calculated in time domain. And the fatigue damage calculated from two different modal spectra are compared quantitatively. Then the suitability of existent wide band fatigue damage models for quarter modal spectrum was evaluated by comparison of frequency domain calculation and time domain calculation. The result show that although spectral density of IL motion is not remarkable in quantity, the effect on the fatigue damage is significant and existent fatigue damage models are not adequately estimating damage by quarter-modal spectra.

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Fatigue Damage

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Spectral methods for lifetime prediction under wide-band stationary random processes

Cited by 311 publications

References 12 publications

A bandwidth correction to the Allegri-Zhang solution for accelerated random vibration testing

A bandwidth correction to the Allegri-Zhang solution for accelerated random vibration testing

A Study on the Riser Fatigue Analysis Using a Quarter-modal Spectrum

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