Mean stress effects in fretting fatigue life estimation method using fatigue damage gradient correction factor

Hwang, Dong Hyeon; Cho, Sung-San

doi:10.1007/s12206-017-0817-6

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…The actual stress state is converted to the symmetrical cyclic stress state of the test bar based on an equal life. This study uses Goodman's modified method and the improved Gerber correction method [6][7]…”

Section: Average Stress Correctionmentioning

confidence: 99%

“…The proposed model was found to provide the best life predictions for the mean stress fatigue life data of all three materials under the tensile and compressive mean stresses. Hwang et al [7] examined the effect of mean stress on fatigue damage gradient correction function and conducted fretting fatigue experiments to obtain the fatigue life data with R values ranging from −1.0 to 0.3. The results revealed that fretting fatigue life decreases with an increased stress ratio.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Fatigue Reliability Life of Telescopic Rod of an Eccentric Telescopic Rod Conveyor with and without Strength Degradation

Mou¹

2019

IJPE

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Eccentric telescopic rod conveyors are used to convey straw from chain conveyors to the feeding and compression mechanism of the 4FZ-2000A type self-propelled straw harvesting baler. As the main working component, the telescopic rod endures higher dynamic loads while conveying the straw. This will make the telescopic rod prone to fatigue fracture. Therefore, it is necessary to find a feasible model that can accurately estimate the fatigue reliability life of the telescopic rod. In order to ensure the safe working of the eccentric telescopic rod conveyer, a mechanical model of the main bearing parts of the telescopic rod is established, and virtual prototype technology is used to obtain the work load spectrum borne by the telescopic rod. Static analysis of the telescopic rod using the finite element method shows that the telescopic rod experiences multi-axial stress fatigue, and the critical section is determined. The S-N curve equation of the structure modified by the surface mass and stress gradient, critical plane approach, Miner's cumulative fatigue linear damage model, and Gaussian normal distribution model of fatigue life are used to estimate the fatigue life of the telescopic rod. In order to predict the fatigue life of the telescopic rod accurately, fatigue reliability lives are calculated with and without consideration of the strength degradation. The results show that: (1) the fatigue life prediction without considering the strength degradation is far different from practical experience; the results obtained after considering the strength degradation are more conservative and more consistent with the actual fatigue lives. The prediction results are more accurate. (2) When the strength degradation is considered, the modified Gerber correction method is more accurate than the Goodman correction method. The results of this study can provide a reference for the fatigue reliability analysis and optimization of eccentric telescopic rod conveyors.

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Section: Average Stress Correctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Fatigue Reliability Life of Telescopic Rod of an Eccentric Telescopic Rod Conveyor with and without Strength Degradation

Mou¹

2019

IJPE

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“…In the regime of high-cycle fatigue (HCF), the application of multiaxial HCF criteria based on the critical plane approach to the contact problems generally leads to the overestimation of the fatigue life [13,14]. Nevertheless, the Smith-Watson-Topper (SWT), which has been used to describe the fretting fatigue life successfully in the regime of low-cycle fatigue (LCF) [15][16][17], is one of the famous damage parameters. In this paper, the traditional SWT parameters are modified to describe the fretting fatigue life of the TC11 alloy after hardening by the consideration of the variations of the hardening layer's elastic modulus.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Laser Quenching on Fretting Fatigue Life

Zhang

Yang

Cui

et al. 2019

Metals

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Laser quenching hardening is one of the most used surface treated technologies. In order to study the effect of laser quenching on the fretting fatigue life, fretting fatigue experiments of TC11 (Ti-6.5Al-1.5Zr-3.5Mo-0.3Si) titanium alloy specimens with different surface conditions were carried out on a special hydraulic servo fatigue test system. The experimental results showed that laser quenching hardening has a good performance in increasing the fretting fatigue lives of the TC11 alloy. However, the effects of laser quenching on fretting fatigue are more obviously at low stress level than at high stress level, the fretting fatigue life was increased by 110.78% at low stress level and 17.56% at high stress level, respectively. Based on the critical plane approach, the traditional SWT (Smith–Watson–Topper) parameter was modified and used to describe the fretting fatigue life of the TC11 alloy after hardening by the consideration of the variations of the hardening layer’s elastic modulus. Compared with the experimental results, all the errors of the predicted results lied in the error band of two.

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Compilation of load spectrum of machining center spindle and application in fatigue life prediction

Wang

et al. 2019

J Mech Sci Technol

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Mean stress effects in fretting fatigue life estimation method using fatigue damage gradient correction factor

Cited by 3 publications

References 16 publications

Comparison of Fatigue Reliability Life of Telescopic Rod of an Eccentric Telescopic Rod Conveyor with and without Strength Degradation

Comparison of Fatigue Reliability Life of Telescopic Rod of an Eccentric Telescopic Rod Conveyor with and without Strength Degradation

Study on the Effect of Laser Quenching on Fretting Fatigue Life

Compilation of load spectrum of machining center spindle and application in fatigue life prediction

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