A Critical Plane Approach to Multiaxial Fatigue Damage Including Out‐of‐phase Loading

Fatemi, Ali; Socie, D. F.

doi:10.1111/j.1460-2695.1988.tb01169.x

Cited by 1,547 publications

(950 citation statements)

References 16 publications

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“…Fatemi and Socie parameter [42] is a parameter defined according to the critical plane approaches. This parameter is obtained by the normal stress on the maximum shear strain plane as shown in the following form (9) where is the maximum shear strain.…”

Section: Fatemi-socie Parametermentioning

confidence: 99%

Load path sensitivity and fatigue life estimation of 30CrNiMo8HH

Noban

Jahed

Ibrahim

et al. 2012

International Journal of Fatigue

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A set of strain-controlled biaxial proportional and non-proportional tests were conducted on solid and tubular specimens of 30CrNiMo8HH steel. The effect of the phase angle on fatigue life was studied. This effect becomes noticeable when applying a 90° out-of-phase loading, reducing the fatigue life by a factor up to 5. It has been shown that the material has no additional hardening due to out-of-phase loading. To account for this severe path dependency, a material dependent non-proportionality modification factor is proposed. This path dependent sensitivity factor is applied to six different fatigue parameters including maximum equivalent total strain, maximum equivalent stress, Smith-Watson-Topper, Fatemi-Socie, plastic strain energy density and total strain energy density to correlate the fatigue results. The predicted fatigue lives are compared with the experiments. The cyclic plasticity models of Mroz and Chaboche were successfully employed to model the cyclic behavior of 30CrNiMo8HH steel. It has been shown that estimations based on the proposed non-proportionality modification factor agree well with the experimental results. ____________________________

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Section: Fatemi-socie Parametermentioning

confidence: 99%

Load path sensitivity and fatigue life estimation of 30CrNiMo8HH

Noban

Jahed

Ibrahim

et al. 2012

International Journal of Fatigue

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“…The minimal, maximal and average stress values of the internal surface are given on Fig.11. These curves show that the use of a fatigue criterion, taking into account the mean (or hydrostatic) stress or strain [24,25,26,27], should be applied using the actual mechanical conditions at the inner surface of the tube, that occur after stabilization of stress and strain fields. The computed ratcheting (Fig.10) is induced by the difference of mean temperature between the test section (cyclically cooled and heated) and the constantly heated other sectors of the pipe.…”

Section: Meshing Boundary Conditions and Numerical Resultsmentioning

confidence: 99%

Fatigue life prediction for broad-band multiaxial loading with various PSD curve shapes

Niesłony

Růžička

Papuga

et al. 2012

International Journal of Fatigue

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The main purpose of this study is to determine, via a three dimensions Finite Element analysis (FE), the stress and strain fields at the inner surface of a tubular specimen submitted to thermo-mechanical fatigue. To investigate the surface finish effect on fatigue behaviour at this inner surface, mechanical tests were carried out on real size tubular specimens under various thermal loadings. X ray measurements, Transmission Electron Microscopy observations and micro-hardness tests performed at and under the inner surface of the specimen before testing, revealed residual internal stresses and a large dislocation microstructure gradient in correlation with hardening gradients due to machining. A memory effect, bound to the pre-hardening gradient, was introduced into an elasto-visco-plastic model in order to determine the stress and strain fields at the inner surface. The temperature evolution on the inner surface of the tubular specimen was first computed via a thermo-elastic model and then used for our thermo-mechanical simulations. Identification of the thermo-mechanical model parameters was based on the experimental stabilized cyclic tension-compression tests performed at 20°C and 300°C. A good agreement was obtained between numerical stabilized tractioncompression cycle curves (with and without pre-straining) and experimental ones. This 3 dimensional simulation gave access to the evolution of the axial and tangential internal stresses and local strains during the tests. Numerical results showed: a decreasing of the tangential stress and stabilization after 40 cycles, whereas the axial stress showed weaker decreasing with the number of cycles. The results also pointed out a ratcheting and a slightly non proportional loading at the inner surface. The computed mean stress and strain values of the stabilized cycle being far from the initial ones, they could be used to get the safety margins of standard design related to fatigue, as well as to get accurate loading conditions needed for the use of more advanced fatigue analysis and criteria.

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“…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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A Critical Plane Approach to Multiaxial Fatigue Damage Including Out‐of‐phase Loading

Cited by 1,547 publications

References 16 publications

Load path sensitivity and fatigue life estimation of 30CrNiMo8HH

Load path sensitivity and fatigue life estimation of 30CrNiMo8HH

Fatigue life prediction for broad-band multiaxial loading with various PSD curve shapes

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

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