Non-stationarity index in vibration fatigue: Theoretical and experimental research

Capponi, Lorenzo; Česnik, Martin; Slavič, Janko; Cianetti, Filippo; Boltežar, Miha

doi:10.1016/j.ijfatigue.2017.07.020

Cited by 53 publications

(25 citation statements)

References 21 publications

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“…Moreover, the interval estimation should be limited from the lower confidence of one side and the upper confidence on the other side of natural logarithmic fatigue life, which is relevant to the confidence level of γ and the reliability of p, as written in Equations (16) and (17), respectively.…”

Section: Proposed Mathematical Model Based On Probabilistic For Straimentioning

confidence: 99%

“…The relationship of nonstationarities and non-Gaussianities was studied by Cesnik and Capponi in a vibration fatigue analysis. The Gaussianity and stationarity were important assumptions of the fatigue damage theory in the frequency domain approach [17,18]. Capponi indicated that different rates of amplitude-modulated nonstationary excitation have a shorter fatigue life than the stationary excitation level for the dynamic structure's response and dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue Reliability Assessment of an Automobile Coil Spring under Random Strain Loads Using Probabilistic Technique

Manouchehrynia

Abdullah

Singh

2019

Metals

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This paper presents a mathematical model to estimate strain-life probabilistic modeling based on the fatigue reliability prediction of an automobile coil spring under random strain loads. The proposed technique was determined using a probabilistic method of the Gumbel distribution for strain-life models of automobile suspension systems. Strain signals from different road excitations in experimental tests were measured. The probability density function of the Gumbel distribution was considered to estimate model parameters using maximum likelihood estimation (MLE). The Akaike information criterion (AIC) method was performed to specify which model can estimate the best fit model parameters. Results demonstrated a good agreement between the predicted fatigue lives of the proposed probabilistic model and the measured strain fatigue life models. The root-mean-square errors (RMSE) based on the Coffin–Manson, Morrow, and Smith–Watson–Topper strain-life models were approximately 0.00114, 0.00107, and 0.00509, respectively, indicating a high correlation with the proposed model and experimental data. The results demonstrated that the proposed probabilistic model is effective for the fatigue life prediction of automobile coil springs using strain and stress fatigue life approaches.

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Section: Proposed Mathematical Model Based On Probabilistic For Straimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue Reliability Assessment of an Automobile Coil Spring under Random Strain Loads Using Probabilistic Technique

Manouchehrynia

Abdullah

Singh

2019

Metals

View full text Add to dashboard Cite

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“…In random vibration theory, there are many type of stationary depending on which property is considered (for example, the term "weakly stationary" denotes a process stationary in both mean and auto-correlation function). A statistical test ('run test') can also be used to detect a change in the statistical properties of an individual time-history of a random process and to conclude whether it is actually stationary or not [59][60][61].…”

Section: Non-stationary Processesmentioning

confidence: 99%

Frequency‐based analysis of random fatigue loads: Models, hypotheses, reality

Benasciutti

Tovo

2018

Materialwissenschaft Werkst

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Spectral methods use analytical expressions to estimate the fatigue damage in vibrating structures subjected to uniaxial or multiaxial random stresses. They exploit the random vibration theory which idealizes the random stress as a random process characterized by a power spectral density (PSD) in the frequency‐domain. The random process is hypothesized to be stationary or non‐stationary, Gaussian or non‐Gaussian, and with narrow‐band or wide‐band power spectral density. The accuracy of analytical spectral solutions depends on whether such hypotheses are fulfilled by actual random time‐histories encountered in practice. Knowing the range of applicability of each spectral method is then of utmost importance to avoid estimation errors. After a short account on the frequency‐domain description of random processes, this paper presents a brief survey on selected spectral methods for uniaxial and multiaxial random loading. It then analyzes when the hypotheses behind each spectral method are not verified in reality, with the purpose to provide recommendations for a safe use of frequency‐based methods.

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“…In general, a state of multiaxial stress is generated when all of the Cartesian stress tensor components change over time with different trend. This implies a considerable complication in the design of experimental fatigue tests . The problems from which this complexity of analysis derive are multiple but mainly concern the design of a system that generates a different temporal trend of stress components, and machines are extremely expensive and difficult to design .…”

Section: Specimen Geometry and Random Experimental Multiaxial Settingmentioning

confidence: 99%

Experimental multiaxial fatigue tests realized with newly developed geometry specimens

Morettini

Braccesi

Cianetti

2018

Fatigue Fract Eng Mat Struct

Self Cite

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In the literature there are many experimental results of multiaxial fatigue testing, usually generated by the combination of two or more cyclical loads. The cases in which samples are randomly stressed are rarer. Moreover, to generate particular stress states, the use of specific machinery for fatigue tests is usually required. For these reasons, the authors have created a particular geometry of specimens, which, when solicited by a single input of a random type, guarantees the creation of specific multiaxial stress states without using complex and costly instruments. The experimental tests were finally used for the validation of the multiaxial reduction method developed and currently utilized in the authors' design phase, though potentially used to verify all the other methodologies present in the literature.

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Non-stationarity index in vibration fatigue: Theoretical and experimental research

Cited by 53 publications

References 21 publications

Fatigue Reliability Assessment of an Automobile Coil Spring under Random Strain Loads Using Probabilistic Technique

Fatigue Reliability Assessment of an Automobile Coil Spring under Random Strain Loads Using Probabilistic Technique

Frequency‐based analysis of random fatigue loads: Models, hypotheses, reality

Experimental multiaxial fatigue tests realized with newly developed geometry specimens

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