Geometrical size effect in the fatigue life predictions of aluminum wires with micro holes using methods of the critical distance

Martínez, Jesús Mauricio González; Adriano, Vitor; Araújo, J.A.; Ferreira, J.L.A.; Silva, Cosme Roberto Moreira

doi:10.1016/j.engfracmech.2018.12.034

Cited by 10 publications

(4 citation statements)

References 28 publications

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“…According to these authors, for lives shorter than 10 6 cycles, a variation in the applied loads has less influence on life in fretting than on life in plain fatigue. This characteristic is also observed by Adriano et al [25] and Martínez et al [26] when studying the notch effect on the fatigue strength of alloy 6201; however, the authors did not make any observations regarding such behavior.…”

Section: Experimental Analysissupporting

confidence: 54%

Numerical and experimental analysis of fretting fatigue performance of the 1350-H19 aluminum alloy

Pereira

Díaz

Ferreira

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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When power transmission cables are subjected to oscillatory displacements, due to the wind vibration, fretting fatigue phenomenon takes place, being the main prompter of catastrophic failure. In this work, we investigate the behavior of an 1350-H19 aluminum wire, that is a structural element of the IBIS (ACSR 397.5 MCM) conductor cable, when subjected to fretting fatigue. For this, a numerical methodology was developed, in which a three-dimensional finite element model was constructed to obtain the maximum Von Mises stresses in the vicinity of the wire-to-wire contact. Thus, a stress-based uniaxial fatigue approach was implemented, resulting in S-N curves. The effect of mean stresses on fatigue behavior was also considered through a series of well-known models. The data generated in this process were validated with experimentally obtained S-N curves on a MTS 322.21 machine, especially modified for this purpose. Most of the results were within the limits considered, with slightly conservative tendencies. A new value of adjustable material parameter has been proposed to be used with Walker's model, increasing the accuracy of the predictions.

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Section: Experimental Analysissupporting

confidence: 54%

Numerical and experimental analysis of fretting fatigue performance of the 1350-H19 aluminum alloy

Pereira

Díaz

Ferreira

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…The next step involved applying appropriate boundary conditions and external loads. The force in ANSYS Workbench will be on one side, and the other side will be fixed support as shown in Figure (9). As for the shape (10), which contains notch, the force is far from the slitting by (50) mm.…”

Section: Boundary Conditionmentioning

confidence: 99%

“…The researchers studied (J. M. G. Martinez, et.al., 2019) [9] the effect of the size of the geometry on the prediction of the fatigue life of aluminum holes with small holes using critical distance methods. The wires used in the study are made of aluminum alloy 6201-T81.…”

Section: Introductionmentioning

confidence: 99%

Study the effect of notches on bending fatigue strength of 2024 aluminum sheets

Khalaf¹,

Mahgoob²

2023

Global J. Eng. Technol. Adv.

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In the present study, the effect of holes on the curvature fatigue strength of 2024 aluminum sheets. Has been studied by taking a model of this type and cutting it into models with the dimensions required for testing and by using a central hole as the main variable by making a central whole (CH) with a diameter of (1mm). The device used in this research is a Reversed bending machine of type HI-TECH from a British origin, all tests were done at a constant stress ratio (R = -1), a rotational speed of 6000 rpm and a frequency (100 Hz). The study was practically and theoretically (using the ANSYS15.0 program). The results showed that stress is affected by the presence of holes and we notice increased stress in the samples that contain holes more than the core samples that do not contain holes and thus we notice that fatigue strength decreases in the samples that contain a central hole by (32%) of the core samples by the practical side on the theoretical side, strength of fatigue less than percentage (43.7%). The yield strength was found by tensile test equal to (73.6 MPa) and the ultimate tensile strength (195.2 MPa) as for the hardness value (59.7). Also, from the results obtained, it appears that streaking acts as stress centers, thereby increasing stress and thereby reducing the number of cycles and consequently failure.

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“…They showed that the plastic behavior of the cable resulted in a minimal notch sensitivity for cracks starting from different positions associated with lower geometrical stress concentration factors. Martínez et al [ 5 ] also have attempted to estimate the fatigue life in wires with blind micro holes. Their assessment of the geometric discontinuities in AA 6201-T81 wires showed good agreement with calculations based on Theory of Critical Distances.…”

Section: Introductionmentioning

confidence: 99%

Fracture Surface Behavior of 34CrNiMo6 High-Strength Steel Bars with Blind Holes under Bending-Torsion Fatigue

2021

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The present study evaluates the fracture surface response of fatigued 34CrNiMo6 steel bars with transverse blind holes subjected to bending with torsion loading. The analysis of the geometric product specification was performed by means of height parameters Sx, functional volume parameters Vx, and fractal dimension Df. Surface topography measurements were carried out using an optical profilometer with focus variation technology. The experimental results show that the doubling the bending to torsion moment ratio B/T from B/T = 1 to B/T = 2, maintaining the same normal stress amplitude, greatly reduces both Sa, Vv as well as the fractal dimension Df of the analyzed specimen fractures by 32.1%, 29.8%, and 16.0%, respectively. However, as expected, a two-fold increase in the B/T ratio, maintaining the same normal stress amplitude, resulted in a larger number of cycles to fatigue crack initiation, Ni, which can be explained by the lower shear stress level. These experiments prove that parameters Sx, Vx, Df are smaller for larger Ni values, which is an important finding. In addition, it was found a high consistency of surface topography measurements for the two sides of the broken specimens. The proposed methodology is both reliable and applicable for other engineering applications involving different geometries and loading conditions.

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Geometrical size effect in the fatigue life predictions of aluminum wires with micro holes using methods of the critical distance

Cited by 10 publications

References 28 publications

Numerical and experimental analysis of fretting fatigue performance of the 1350-H19 aluminum alloy

Numerical and experimental analysis of fretting fatigue performance of the 1350-H19 aluminum alloy

Study the effect of notches on bending fatigue strength of 2024 aluminum sheets

Fracture Surface Behavior of 34CrNiMo6 High-Strength Steel Bars with Blind Holes under Bending-Torsion Fatigue

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