On the effect of random defects on the fatigue notch factor at different stress ratios

Karlén, Kristoffer; Olsson, Mårten; Ahmadi, Hamidreza; Härkegård, G.

doi:10.1016/j.ijfatigue.2011.07.011

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…(6). In order to compute the fatigue failure probability from FE-results, the integration term in Eq.…”

Section: The D-model Defect Based Mechanisms For Fatiguementioning

confidence: 99%

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An investigation of a fatigue model with two competing failure mechanisms

Karlén¹,

Olsson²

2014

International Journal of Fatigue

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A new combined fatigue model that considers a defect based and a stress based mechanism is presented. The defect part is based on the weakest link theory, where the integration is performed either over the surface area or the volume of the component. The stress based mechanism is described by the normal distribution, where the stress is either the largest occurring stress value, the point stress, or the point stress adjusted with the stress gradient, denoted the gradient adjusted point stress. Experiments on notched specimens have been performed. The combined model behaves almost like only a stress based model at high failure probabilities. At low failure probabilities, results are less clear. There, the stress based model is not accurate and the defect based model (both for area and volume) dominates. Using the gradient adjusted point stress in the stress based model and the volumetric weakest link integral in the defect based model being described by gives the best overall fit to the probability of failure. It is noted that for design with respect to high failure probabilities (> 20 %), it is enough use only the gradient adjusted stress based model.

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“…(6). In order to compute the fatigue failure probability from FE-results, the integration term in Eq.…”

Section: The D-model Defect Based Mechanisms For Fatiguementioning

confidence: 99%

“…In a solid mechanics setting, the defects can be modeled using either stress based models like the Weakest Link (WL)-integral, [1,2], as in [3][4][5], or defect tolerant approaches for instance [6]. The defects can be either internal, volumetric, defects or surface defects.…”

Section: Introductionmentioning

confidence: 99%

An investigation of a fatigue model with two competing failure mechanisms

Karlén¹,

Olsson²

2014

International Journal of Fatigue

Self Cite

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“…The concept of weakest-link is widely used to account for the statistical variability 5 in low-cycle fatigue [38], in assessing the mean stress effect [39], in reinterpreting the Kitagawa-Takahashi diagram [40], in estimating the microstructure-sensitivity of the fatigue notch factor [41]. Fracture mechanics approaches encapsulating a stochastic fatigue crack growth rate law have been proposed to estimate the statistical distribution of the fatigue life spent for crack propagation [42,43].…”

Section: Introductionmentioning

confidence: 99%

Statistical significance of notch fatigue prognoses based on the strain-energy–density method: Application to conventionally and additively manufactured materials

Benedetti

Dallago

Santus

2020

Theoretical and Applied Fracture Mechanics

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“…To estimate the fatigue failure probability, continuous efforts were made on the appropriate treatments of uncertainties in fatigue process, such as basic material properties (eg, elastic modulus, fracture toughness, and yield strength), 6,7 equivalent initial flaw size, 8 surface cracks, 9 and defects.. 10,11 However, these probabilistic approaches are focused on describing life variety at a specimen's level. It is recognized that combining finite element analysis (FEA) and cyclic plasticity model in a component level can yield more accurate results.…”

Section: Introductionmentioning

confidence: 99%

A reliability‐based fatigue design for mechanical components under material variability

Wang

Luo

2019

Quality & Reliability Eng

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The mechanical components subjected cyclic load unusually fail due to fatigue.The traditional deterministic design method still has the risk of failure while the safety factor method sometimes is overconservative and uneconomic. In this study, reliability-based design optimization is applied in structural design of components under low cycle fatigue. A constitutive model (Jiang and Sehitoglu model) was written into user-defined material subroutine of finite element software to make simulation more accurate. In addition, an adaptive least squares support vector machines (LS-SVM)-based response surface method is employed to improve the efficiency of design process. After constructing the implicit life model, a hybrid directional step method is employed to implement the performance measure approach. Finally, a simple case (thickness optimization for cantilever tube) is used to demonstrate the whole procedure of proposed design procedure.z KEYWORDS fatigue design, performance function approach, reliability-based optimization design

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On the effect of random defects on the fatigue notch factor at different stress ratios

Cited by 8 publications

References 11 publications

An investigation of a fatigue model with two competing failure mechanisms

An investigation of a fatigue model with two competing failure mechanisms

Statistical significance of notch fatigue prognoses based on the strain-energy–density method: Application to conventionally and additively manufactured materials

A reliability‐based fatigue design for mechanical components under material variability

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