Effects of Complex Stress-Time Cycles on the Fatigue Properties of Metals

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

doi:10.1115/1.4013318

Cited by 9 publications

(3 citation statements)

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Section: Deterministic Estimation Frameworkmentioning

confidence: 99%

“…To address this issue, many nonlinear damage rules are proposed based on Palmgren-Miner rule. Marco-Starkey first proposed an exponential relation of the cyclic ratio based on the damage curve (Marco and Starkey, 1954; Starkey and Marco, 1957), i.e., where α i is the material parameter related to the given stress σ i . Equation (12) gives the qualitative description of the fatigue damage but cannot account for the loading sequence effect.…”

Section: Deterministic Fatigue Estimation Framework Under Valmentioning

confidence: 99%

“…To overcome the deficiencies in LDR, a variety of non-linear damage rules are proposed to consider the loading sequence effect. Marco and Starkey (Marco and Starkey, 1954; Starkey and Marco, 1957) first proposed an exponential type nonlinear rule with a material parameter based on the observation of the damage curve. Later, Manson (Manson and Halford, 1981) further developed the Marco-Starkey damage rule by formulating the equation of material parameter.…”

Section: Introductionmentioning

confidence: 99%

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A modified fatigue damage model considering loading sequence effect

Zhu

Zhang

Ding

2022

International Journal of Damage Mechanics

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A modified fatigue damage model is proposed considering the loading sequence effect under variable amplitude loading conditions. The transition sequence is obtained from the counting sequence by an equivalent rainflow counting method and is used to provide the loading sequence information for fatigue damage accumulation prediction. Rainflow counting matrix and sequence transition matrix are formulated based on the rainflow counting sequence and the transition sequence. The relation between the two matrices and the original loading sequence is evaluated in detail. In the deterministic fatigue estimation, the rainflow counting matrix and the sequence transition matrix are integrated into the proposed modified damage model based on the linear damage rule. Mean stress transition is applied to the rainflow counting matrix for loading level effect. Existing experimental data are used to validate the fatigue damage estimation from the deterministic framework. In order to evaluate the fatigue under random loading conditions, the rainflow counting matrix and sequence transition matrix are mapped to one-dimensional exponential and Laplace distributions based on the stationary random process. Numerical simulation is conducted to validate the proposed mapping distributions. Meanwhile, the impact of the correlation length on the proposed distributions under stationary random loading sequence is investigated as well. Finally, with the given distributions of the rainflow counting matrix and sequence transition matrix, a reconstruction procedure is simulated and discussed for probabilistic fatigue estimation. The proposed model provides a sophisticated approximation to the original loading sequence with a sequence transition effect. The proposed modified fatigue damage model corrects the deficiencies of the linear damage rule with sufficient sequence information from the originally applied loading. Furthermore, the probabilistic fatigue estimation can evaluate the accumulated fatigue damages under a random loading process with the sequence transition effect.

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Section: Deterministic Estimation Frameworkmentioning

confidence: 99%

Section: Deterministic Fatigue Estimation Framework Under Valmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A modified fatigue damage model considering loading sequence effect

Zhu

Zhang

Ding

2022

International Journal of Damage Mechanics

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Application of fracture mechanics and half-cycle theory to the prediction of fatigue life of aerospace structural components

1989

Int J Fract

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The service life of aircraft structural components undergoing random stress cycling was analyzed by the application of fracture mechanics. The initial crack sizes at the critical stress points for the fatigue crack growth analysis were established through proof load tests. The fatigue crack growth rates for random stress cycles were calculated using the half-cycle method. A new equation was developed for calculating the number of remaining flights for the structural components. The number of remaining flights predicted by the new equation is much lower than that predicted by the conventional equation.This report describes the application of fracture mechanics and the half-cycle method to calculate the number of remaining flights for aircraft structural components.

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Determination of longevity under a two-frequency load (review). Report 1

Trufyakov

Koval'chuk

1982

Strength Mater

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Effects of Complex Stress-Time Cycles on the Fatigue Properties of Metals

Cited by 9 publications

References 0 publications

A modified fatigue damage model considering loading sequence effect

A modified fatigue damage model considering loading sequence effect

Application of fracture mechanics and half-cycle theory to the prediction of fatigue life of aerospace structural components

Determination of longevity under a two-frequency load (review). Report 1

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