Mean Stress Effects on Low Cycle Fatigue for a High Strength Steel

Koh, Seung Kee; Stephens, R. I.

doi:10.1111/j.1460-2695.1991.tb00672.x

Cited by 183 publications

(89 citation statements)

References 7 publications

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“…The characteristics of the high-cycle fatigue strength are influenced appreciably by the cycle mean stresses, σ m , which lead to the load cycle asymmetry characterized by the cycle stress ratio R = σ σ min max , where σ min and σ max are the minimum and maximum stresses in a cycle. Inelastic deformation and fatigue failure of metals and alloys with allowance for the influence of the cycle mean stresses were studied in [63][64][65][66][67][68][69][70][71].…”

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confidence: 99%

Nonlocalized Fatigue Damage of Metals and Alloys. Part 2. Interrelation between Fatigue and Inelasticity

Troshchenko

2005

Strength Mater

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The paper considers interrelation between the regularities in the fatigue fracture and inelastic deformation taking into account the material properties, stress gradient and concentration, specimen size, load cycle asymmetry, complex stress state, temperature, loading frequency and conditions, scatter of the test results. Analysis of the data from the literature and results of original investigations has shown that the characteristics of inelasticity, which define nonlocalized fatigue damage, can be used in studies of general regularities of the high-cycle fatigue fracture. Specific results of such analysis are presented.Keywords: high-cycle fatigue, inelasticity, manufacturing, design, and service factors.Introduction. The main characteristic that determines the resistance of metals and alloys to high-cycle fatigue and is used in calculations of strength and service life of machines and structures is a fatigue curve, which represents the relation between variable stresses and the number of cycles to fracture.The fatigue curve is used to determine the fatigue limit equal to the maximum stresses, which the material can withstand without failure during an infinite (≥10 7 ) number of the load cycles, and the stresses corresponding to a given number of the load cycles to fracture.As is shown by numerous investigations [1-10], those fatigue strength characteristics depend on the structure and fabrication technique of the material and components, their design features, operating conditions, and other factors and can differ appreciably for the same material.Along with construction of fatigue curves in the coordinates stress -number of cycles to fracture, in recent years, basing, in the first place, on the results of studying low-cycle fatigue, the relations are considered between variable strains and number of cycles to fracture [11-17, etc.]. When constructing such relationships, it is considered that the total strain amplitude, ε a , consists of the elastic, ε ae , and inelastic, ε ain , components.A more detailed analysis of the strain criteria of fatigue fracture will be made in Part 3. In this paper, most attention, so far as the experimental data permit, is concentrated on the consideration of the possibilities to establish a relationship between the regularities in the fatigue fracture and inelastic deformation, which characterizes nonlocalized fatigue damage under high-cycle fatigue.Early works are known [18][19][20][21][22], where interrelation between the regularities in inelastic deformation, which is characterized by inelastic strains and inelastic strain energy, heating of specimen, damping capacity, etc., and fatigue fracture were studied, primarily, in connection with the development of methods for accelerated determination of the fatigue limit and prediction of life with the account for the influence of various factors.Basic results in those investigations were obtained in testing smooth specimens under simple conditions. With the use of the data from the literature and the results of unique experimental...

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Nonlocalized Fatigue Damage of Metals and Alloys. Part 2. Interrelation between Fatigue and Inelasticity

Troshchenko

2005

Strength Mater

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“…This implies that changes in the strain ratio do not significantly affect the fatigue performance of a welded joint in low-cycle region. Many studies also demonstrated that an increased mean stress has more influence on the fatigue characteristics than the effect of the strain ratio in low-cycle regions [3,21]. cyclic softening compared to the tendency of R = −1.…”

Section: Strain Ratio Effectmentioning

confidence: 99%

Effect of Cryogenic Temperature on Low-Cycle Fatigue Behavior of AISI 304L Welded Joint

Song

Kim

et al. 2018

Metals

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Abstract:The aim of this study is to investigate the low-cycle fatigue (LCF) properties of an AISI 304L welded joint based on experimental data. The influential parameters on the LCF such as the specimen thickness, strain ratio and cryogenic temperature were considered in this experimental study. In order to investigate the thickness effect on the LCF behavior, two types of specimens with thicknesses of 5 mm and 10 mm were used in an LCF test. In addition, the fatigue tests were conducted under strain control with three different strain ratios of R = −1, 0, and 0.5 at room and cryogenic temperatures. Based on the results obtained by this experimental study, no significant effect involved with the thickness and the strain ratio were observed. However, it was clearly observed that LCF performance at room temperature is lower than that at cryogenic temperature. Finally, an LCF design curve that can be used in design of the liquefied natural gas (LNG) applications is suggested.

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“…As can be seen, the SWT method has the advantage of simplicity and is not depending on any material constants. Besides, it is found that the SWT model provides good life prediction results in the long fatigue life region but is conservative in the low cycle fatigue life region [30,31].…”

Section: Mean Stress Models In Fatiguementioning

confidence: 99%

A Modified Walker Model Dealing with Mean Stress Effect in Fatigue Life Prediction for Aeroengine Disks

Mao

et al. 2018

Mathematical Problems in Engineering

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Mean stress effect plays an important role in fatigue life prediction, and it is discovered that maximum stress has nonnegligible influence on mean stress effect. Therefore, a modified Walker model is proposed to account for mean stress effect on fatigue life of aeroengine disks, which contains the influence of stress ratio and maximum stress on mean stress effect. Eight sets of fatigue data for standard smooth bars from six kinds of materials commonly used in aeroengine disks as well as two sets of experimental data from simulated specimens of turbine disks were employed to investigate the prediction capability of the proposed model against other candidate mean stress relationships. It is found that Goodman model generates most conservative results, while Morrow model overestimates fatigue life for most cases. SWT model yields similar results to Walker model but with less accuracy. The results of the modified Walker model turn out to be superior to those of any other candidate models for all cases examined, especially for large mean stress ones. Thus, the modified Walker model can be an effective method to predict fatigue lives of aeroengine disks influenced by mean stresses.

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Mean Stress Effects on Low Cycle Fatigue for a High Strength Steel

Cited by 183 publications

References 7 publications

Nonlocalized Fatigue Damage of Metals and Alloys. Part 2. Interrelation between Fatigue and Inelasticity

Nonlocalized Fatigue Damage of Metals and Alloys. Part 2. Interrelation between Fatigue and Inelasticity

Effect of Cryogenic Temperature on Low-Cycle Fatigue Behavior of AISI 304L Welded Joint

A Modified Walker Model Dealing with Mean Stress Effect in Fatigue Life Prediction for Aeroengine Disks

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