A Concept of Fatigue Damage

Marco, S. M.; Starkey, W. L.

doi:10.1115/1.4014922

Cited by 98 publications

(34 citation statements)

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“…The DCA was introduced by Manson and Halford 11 . It is based on the damage curve concept of Marco and Starkey, 31 which says that fatigue damage accumulation can be expressed as a power function that is load dependent. The equation for calculating the fatigue life under multilevel block loading is given by the following:

\frac{n_{i}}{N_{i}} = 1 - {([], {([], {([], {((), \frac{n_{1}}{N_{1}})}^{α_{1,2}} + \frac{n_{2}}{N_{2}})}^{α_{2,3}} + \frac{n_{3}}{N_{3}})}^{α_{3,4}} + . . . + \frac{n_{i - 1}}{N_{i - 1}})}^{α_{i - 1, i}}

with α_{i - 1, i} = {((), \frac{N_{i - 1}}{N_{i}})}^{0.4}

The exponent 0.4 is a material parameter but was found not to be critical.…”

Section: Studied Nonlinear Damage Accumulation Modelsmentioning

confidence: 99%

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Method for statistical evaluation of cumulative damage models applied to block loading

Hectors

Hecke

Waele

2022

Fatigue Fract Eng Mat Struct

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There is an abundance of nonlinear fatigue damage accumulation models but a lack of verification and comparison to experimental datasets. First, an extensive two-level block loading experimental fatigue dataset is reprocessed according to current standard practice. Next, four nonlinear damage accumulation models and the Palmgren-Miner linear damage rule are critically compared using a range of statistical metrics. For the considered dataset, the Palmgren-Miner rule consistently performs worst and the damage curve approach is found to perform significantly better than the other nonlinear models. This study shows that the current practice of performance verification of new fatigue damage accumulation models in literature is too limited which enables cherry-picking of verification datasets to improve perceived performance.Future fatigue damage accumulation models should be verified much more rigorously to both readily available and new experimental datasets.

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\frac{n_{i}}{N_{i}} = 1 - {([], {([], {([], {((), \frac{n_{1}}{N_{1}})}^{α_{1,2}} + \frac{n_{2}}{N_{2}})}^{α_{2,3}} + \frac{n_{3}}{N_{3}})}^{α_{3,4}} + . . . + \frac{n_{i - 1}}{N_{i - 1}})}^{α_{i - 1, i}}

with α_{i - 1, i} = {((), \frac{N_{i - 1}}{N_{i}})}^{0.4}

The exponent 0.4 is a material parameter but was found not to be critical.…”

Section: Studied Nonlinear Damage Accumulation Modelsmentioning

confidence: 99%

“…The DCA was introduced by Manson and Halford. 11 It is based on the damage curve concept of Marco and Starkey, 31 which says that fatigue damage accumulation can be expressed as a power function that is load dependent. The equation for calculating the fatigue life under multilevel block loading is given by the following:…”

Section: Dcamentioning

confidence: 99%

Method for statistical evaluation of cumulative damage models applied to block loading

Hectors

Hecke

Waele

2022

Fatigue Fract Eng Mat Struct

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“…One very large study was done in the 1990's by a German group [7]. Generations of researches are trying to improve the damage accumulation theories for better predictability [8][9][10][11][12][13][14][15]. A comprehensive overview by Fatemi and Yang from 1998 is still a good summary for modifications of the linear damage accumulation theory covering the last century [16].…”

Section: Introductionmentioning

confidence: 99%

Sequence effects on the life estimation of thin-walled welded tubular structures made of HSS + UHSS under bending

et al. 2022

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Welded hollow sections are typical in different industries. A database of fatigue life data of welded hollow section joints covering sequence effects and the accuracy of the linear damage accumulation is presented. The effects of the shape of the applied load spectra, sequence effects of different amplitudes have been investigated using two high-strength steels. This document covers thin-walled tubes of 2-mm thickness made of low-carbon or mild steel 1.8849 (S460MH) and austenitic TWIP-steel 1.4678 + CP700 (X30MnCrN16-14). Constant amplitude and two-level load spectra are presented to check the linear damage accumulation. Using stress concentration factors from finite element analysis, typical FAT classes for the structural and the effective notch stress concepts are checked as well. Both structures show much higher strength compared IIW recommendations by structural stress approach and DVS 0905 by effective notch stress approach. Typical maximum linear damage sums taken from recommendations and codes of 0.2 or 0.5 are exceeded for all spectra investigated and in some of the cases even significantly above 1.0. Transferability of the recommendations to component type structures like those tubular joints made of high-strength steel needs revision to lift its lightweight potential but this will require additional data.

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“…Richart and Newmark [31] introduced the concept of the damage curve to overcome the deficiencies associated with the linear damage rule. Upon this concept and the results of load sequence experiments, Marco and Starky [9] proposed the first nonlinear load dependent damage theory, represented by a power law:…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Fatigue Damage Models Using Different Number of Classes Combined with the Rainflow Method

Zengah

Aid

Benguediab

2013

Eng. Technol. Appl. Sci. Res.

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Fatigue damage increases with applied load cycles in a cumulative manner. Fatigue damage models play a key role in life prediction of components and structures subjected to random loading. The aim of this paper is the examination of the performance of the “Damaged Stress Model”, proposed and validated, against other fatigue models under random loading before and after reconstruction of the load histories. To achieve this objective, some linear and nonlinear models proposed for fatigue life estimation and a batch of specimens made of 6082T6 aluminum alloy is subjected to random loading. The damage was cumulated by Miner’s rule, Damaged Stress Model (DSM), Henry model and Unified Theory (UT) and random cycles were counted with a rain-flow algorithm. Experimental data on high-cycle fatigue by complex loading histories with different mean and amplitude stress values are analyzed for life calculation and model predictions are compared.

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A Concept of Fatigue Damage

Cited by 98 publications

References 0 publications

Method for statistical evaluation of cumulative damage models applied to block loading

Method for statistical evaluation of cumulative damage models applied to block loading

Sequence effects on the life estimation of thin-walled welded tubular structures made of HSS + UHSS under bending

Comparative Study of Fatigue Damage Models Using Different Number of Classes Combined with the Rainflow Method

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