Two Decades of Progress in the Assessment of Multiaxial Low-Cycle Fatigue Life

Brown, MW; Miller, K. J.

doi:10.1520/stp32442s

Cited by 82 publications

(31 citation statements)

References 41 publications

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“…Case B is observed to be more damaging (shorter life) for the same ATmax. Case A and Case B behaviors are distinctly plotted in the so-called P plane in Figure 24b, which serves as a convenient means of representing experimental data using a two parameter approach [47].…”

Section: A Rrnax M Ao'nmentioning

confidence: 99%

Basic issues in the mechanics of high cycle metal fatigue

McDowell

1996

Int J Fract

159

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Mechanics issues related to the formation and growth of cracks ranging from subgrain dimension to up to the order of one mm are considered under high cycle fatigue (HCF) conditions for metallic materials. Further efforts to improve the accuracy of life estimation in the HCF regime must consider various factors that are not presently addressed by traditional linear elastic fracture mechanics (LEFM) approaches, nor by conventional HCF design tools such as the S-N curve, modified Goodman diagram and fatigue limit. A fundamental consideration is that a threshold level for AK for small/short cracks may be considerably lower than that for long cracks, leading to non-conservative life predictions using the traditional LEFM approach.Extension of damage tolerance concepts to lower length scales and small cracks relies critically on deeper understanding of (a) small crack behavior including interactions with microstructure, (b) heterogeneity and anisotropy of cyclic slip processes associated with the orientation distribution of grains, and (c) development of reliable small crack monitoring techniques. The basic technology is not yet sufficiently advanced in any of these areas to implement damage tolerant design for HCE The lack of consistency of existing crack initiation and fracture mechanics approaches for HCF leads to significant reservations concerning application of existing technology to damage tolerant design of aircraft gas turbine engines, for example. The intent of this paper is to focus on various aspects of the propagation of small cracks which merit further research to enhance the accuracy of HCF life prediction. Predominant concern will rest with polycrystalline metals, and most of the issues pertain to wide classes of alloys.

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Section: A Rrnax M Ao'nmentioning

confidence: 99%

Basic issues in the mechanics of high cycle metal fatigue

McDowell

1996

Int J Fract

159

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“…Strain-based models are considered for this study as they are more robust in capturing high-cycle fatigue and also low-cycle fatigue where plasticity may occur, and the models under study have either gained some degree of acceptance or are representative of a larger group of related models [21]. A model has been proposed based on cyclic shear and normal strain on the plane of maximum shear to define the stress parameter [22,23] as in Eq. (1).…”

Section: Methodsmentioning

confidence: 99%

“…Building on the work on Brown and Miller [22], Fatemi and Socie [24] proposed to replace the normal strain term by the normal stress, arguing that normal stress can be used to describe mean stress and non-proportional hardening effects (Eq. (2)).…”

Section: Methodsmentioning

confidence: 99%

Fatigue Life Estimation Based on Continuum Mechanics Theory With Application of Genetic Algorithm

Kamal¹,

Rahman²

2015

Int. J. Automot. Mech. Eng.

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In recent years research on fatigue estimation methods has focused on developing the capability to handle complex multiaxial loading conditions. The present study presents the development of a new fatigue life estimation model using the concepts of continuum mechanics with a critical plane based approach, where a genetic algorithm is used to estimate the coefficients of the model. Experimental fatigue lives for steel alloy C40 for in-phase and out-of-phase loading conditions are used to calibrate and analyze the accuracy of the proposed model. Finite element analysis is used to determine the experimental fatigue life of steel alloy C40 published in literature for validation purposes. The proposed model is simple to apply as it does not need to determine any new material constants or properties for the new model. Fatigue life prediction from the proposed model shows good agreement with experimental results for in-phase and outof-phase multiaxial loading.

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“…Brown, Miller and Kandil [23,24], proposed a model based on cyclic shear and normal strain on the plane of maximum shear to define the stress parameter shown in Eq. (1) [25].…”

Section: Methodsmentioning

confidence: 99%

An Integrated Approach for Fatigue Life Estimation Based on Continuum Mechanics Theory and Genetic Algorithm

Kamal¹,

Rahman²

2015

Int. J. Automot. Mech. Eng.

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This paper presents the performance analysis of a newly proposed fatigue estimation model. Research for fatigue estimation methods is focused on developing the capability to handle complex multiaxial loading conditions. This study focuses on an attempt to develop a new fatigue life estimation model using the concepts of continuum mechanics with a critical plane based approach. A genetic algorithm is utilized to estimate the coefficients of stress and strain components. Experimental data for fatigue lives for EN3B steel alloy for in-phase and out-of-phase loading conditions are used to calibrate and analyze the accuracy of the proposed model. Finite element analysis is used to determine an experimental fatigue life of EN3B steel alloy published in literature for validation. The proposed model is easy to implement and does not require the determination of new material constants and material properties. Fatigue life prediction from the proposed model shows good agreement with published results for in-phase and out-of-phase multiaxial loading.

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Two Decades of Progress in the Assessment of Multiaxial Low-Cycle Fatigue Life

Cited by 82 publications

References 41 publications

Basic issues in the mechanics of high cycle metal fatigue

Basic issues in the mechanics of high cycle metal fatigue

Fatigue Life Estimation Based on Continuum Mechanics Theory With Application of Genetic Algorithm

An Integrated Approach for Fatigue Life Estimation Based on Continuum Mechanics Theory and Genetic Algorithm

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