Stress-Based Uniaxial Fatigue Analysis

Lee, Yung–Li; Barkey, Mark E.

doi:10.1016/b978-0-12-385204-5.00004-5

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…In consequence, several methods were proposed, including this effect, such as those of Grubisic-Simbürger [37] and Liu-Zenner [38] amongst others. Modern design rules, such as the FKM Guideline [39,40], include the effect of mean shear stresses in torsional fatigue. The effect for ductile steels is approximately 58% of the effect of axial static stresses in the pure axial fatigue loading case.…”

Section: Introductionmentioning

confidence: 99%

Influence of mean shear stress on the torsional fatigue behaviour of 34CrNiMo6 steel

Pallarés-Santasmartas

Albizuri

Avilés

et al. 2018

International Journal of Fatigue

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Keywords:Torsional fatigue Mean stress effect Haigh diagram Multiaxial fatigue criteria A B S T R A C TThis study provides a theoretical and experimental investigation of the effect of static shear stresses on the highcycle fatigue behaviour of a 34CrNiMo6 high-strength steel under quenched and tempered conditions. Torsion S-N curves under different mean shear stresses were obtained. Experimental results show that an increase in mean shear stress yields a gradual reduction in shear-stress amplitude that the material can withstand without failure. The results for this steel agree well with the Smith's hypothesis for ductile steels, which states that the effect of the torsional mean stresses on the torsional fatigue limit is negligible as long as the maximum shear stress is within the torsional yield strength. Taking into account the results collected from the literature and the experimental results on torsional fatigue of 34CrNiMo6 steel, an extension of the theory of Crossland is proposed to include the mean-shear-stress effect. Its application to the torsional fatigue case with mean shear stresses can be interpreted in terms of a balance of the energy of distortion. Macro-analyses of the specimen fracture appearance were conducted to obtain the fracture characteristics for different mean-shear-stress values under torsion fatigue loading.

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Section: Introductionmentioning

confidence: 99%

Influence of mean shear stress on the torsional fatigue behaviour of 34CrNiMo6 steel

Pallarés-Santasmartas

Albizuri

Avilés

et al. 2018

International Journal of Fatigue

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“…Material nonlinearity should account for plastic deformations when the stress induced during a drive cycle is higher than the yield strength. Additionally, finite element analysis with nonlinear material characteristics is preferred for structures with complicated boundary conditions, materials, and loading conditions [32]. In order to comprehend the stress difference between a linear and a nonlinear material, a simple geometry of a plate with a hole is investigated.…”

Section: Rotor Stress Analysis For a Drive Cyclementioning

confidence: 99%

“…A temperature-dependent S-N curve for 27PNX1350 electrical steel is generated in the nCode MaterialsManager. The stress amplitude intercept and a slope of 1 are used from the experimental data available in [14], and the endurance strength, the stress at fatigue cut-off limit, and a slope of 2 are derived with empirical calculations [32]. Temperature-dependent fatigue properties are used based on the rotor temperature profile to carry out the fatigue analysis at each time step.…”

Section: Thermomechanical Fatigue Analysismentioning

confidence: 99%

Thermomechanical Rotor Fatigue of an Interior Permanent Magnet Synchronous Motor

Sahu,

Haddad,

Al-Ani

et al. 2024

Machines

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Interior permanent magnet synchronous motors (IPMSMs) are extensively used as traction motors today because of their exceptional torque, power density, and wide, constant power operating range. Under real-world usage, an IPMSM rotor undergoes varying electromagnetic, thermal, and mechanical loads. Under such conditions, fatigue life-based design criteria should be used over stress-based design criteria to ensure the structural integrity of the rotor. Moreover, the driving dynamics can change the rotor temperature continuously, which affects the electromagnetic, mechanical, and fatigue properties of the rotor material. This paper proposes a robust thermomechanical rotor fatigue simulation workflow considering significant loads acting on an IPMSM rotor and the temperature variation throughout a drive cycle. It discusses an accelerated fatigue life estimation approach based on the peak valley extraction method to reduce the simulation time significantly for the stress and fatigue analysis. Then, it presents a method for a stress-life curve generation for variable loading. It also presents a sensitivity study with a median S-N curve, and a 90% reliability and 95% confidence (R90C95) S-N curve.

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“…The onset of fatigue cracks may occur due to material imperfections, structural discontinuities, or stress concentrators [ 3 , 4 , 5 , 6 , 7 , 8 ]. The applied fatigue loads may be uniaxial (with one stress component), biaxial (with two stress components), or multiaxial (with more than two stress components) [ 9 , 10 , 11 ]. In the case of uniaxial random loadings, classical methods such as rainflow counting, cumulative damage models, and S-N curves can be used [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Using the Effect of Compression Stress in Fatigue Analysis of the Roller Bearing for Bimodal Stress Histories

2021

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A new approach based on the direct spectral method for fatigue analysis of elements subjected to bimodal stress histories, including high compression effects, is proposed. A correction factor, taking into account the influence of the mean compressive stresses, is used in the proposed method. Equivalent amplitude is estimated, based on criteria proposed by Smith, Watson, and Tooper, and by Bergmann and Seeger. The method is presented with example of a thrust roller bearing. Two cases in which the rollers were subjected to constant force 206 N (where constant amplitude stresses occurred in the rollers) and cyclic force (where bimodal stresses with variable amplitudes occurred in the rollers) are studied. It is observed that multiaxial fatigue criteria (Crossland, Papadopoulos) do not include the influence of bimodal stresses and should not be used for such loading conditions. The proposed method includes both kinds of stress waveforms in the fatigue analysis and can be applied for the accurate identification of stress components and the determination of fatigue life. The damage rate calculated by the proposed approach for rollers subjected to a cyclic force (equivalent load equal to 151 N) was 0.86, which is in good agreement with the recommendations provided in the literature. The obtained accuracy of the proposed method is above 95%.

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Stress-Based Uniaxial Fatigue Analysis

Cited by 8 publications

References 27 publications

Influence of mean shear stress on the torsional fatigue behaviour of 34CrNiMo6 steel

Influence of mean shear stress on the torsional fatigue behaviour of 34CrNiMo6 steel

Thermomechanical Rotor Fatigue of an Interior Permanent Magnet Synchronous Motor

Using the Effect of Compression Stress in Fatigue Analysis of the Roller Bearing for Bimodal Stress Histories

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