A path-dependent multiaxial fatigue life estimation criterion for metals under various loading conditions

Li, Jing; Qiu, Yuanying

doi:10.1016/j.ijfatigue.2021.106300

Cited by 13 publications

(5 citation statements)

References 78 publications

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“…where K 0 is the cyclic strength coefficient and n 0 is the cyclic strain hardening exponent. Substitute Equation (10) into Equation (7), Equation ( 7) can be rewritten as…”

Section: Establishment Of the Life Estimation Modelmentioning

confidence: 99%

“…As for multiaxial loading, many fatigue life estimation criteria have been developed in different expressions. Most of these models can be divided into the following four categories, that is, stress-based approaches, [3][4][5][6][7][8] strainbased approaches, [9][10][11][12][13][14][15] strain-energy-based approaches, [16][17][18][19][20][21][22][23] and fracture mechanics approaches. [24][25][26][27][28][29] Among these fatigue life prediction models, those that combine the concept of critical plane and strain energy density are considered highly advanced for estimating multiaxial fatigue life of materials.…”

Section: Introductionmentioning

confidence: 99%

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Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Li,

Shao,

et al. 2024

Fatigue Fract Eng Mat Struct

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In this paper, the SWT model was improved by incorporating the Walker equation into the strain–life curve. The established model takes into account the material's sensitivity to mean stress by introducing the Walker exponent, w. Under uniaxial loading condition, the proposed model can reduce to the SWT model, Manson‐Coffin equation, and Walker model for w values of 0.5, 1, and 0, respectively. Under multiaxial symmetric loading, when w = 0.5, the proposed model can be simplified as another SWT correction model (CXH) proposed by Chen et al. The prediction accuracy of the established model was validated using about 200 data points collected from literature. These data points were obtained from tests conducted on eight different kinds of metals under various multiaxial loading paths. The verification results indicate that 96.8% and 97.9% of the data points fall within the factor‐of‐three boundary for the loading paths without and with mean stresses, respectively.

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“…where K 0 is the cyclic strength coefficient and n 0 is the cyclic strain hardening exponent. Substitute Equation (10) into Equation (7), Equation ( 7) can be rewritten as…”

Section: Establishment Of the Life Estimation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Li,

Shao,

et al. 2024

Fatigue Fract Eng Mat Struct

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“…Note that how much non-proportional fatigue damage occurs in an object depends on two factors: the loading paths in operation and the material. Until now, a model of fatigue damage that is able to take both load path dependency and material properties into consideration is still an important and challenging issue that has been insufficiently addressed, even though non-proportional fatigue has been found to be generally more damaging than proportional loading [4][5][6][7][8]. Bearing in mind that there is a continuous interest in cost and weight reduction as well as materials savings while simultaneously having to fulfill stricter product reliability requirements, a deeper understanding of the effect of complex and severe loading conditions on material behaviour is desirable.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour and Failure Mode of High Interstitially Alloyed Austenite under Combined Compression and Cyclic Torsion

Ngeru

Kurtulan

Karkar

et al. 2022

Metals

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multiaxial stress states frequently occur in technical components and, due to the multitude of possible load situations and variations in behaviour of different materials, are to date not fully predictable. This is particularly the case when loads lie in the plastic range, when strain accumulation, hardening and softening play a decisive role for the material reaction. This study therefore aims at adding to the understanding of material behaviour under complex load conditions. Fatigue tests conducted under cyclic torsional angles (5°, 7.5°, 10° and 15°), with superimposed axial static compression loads (250 MPa and 350 MPa), were carried out using smooth specimens at room temperature. A high nitrogen alloyed austenitic stainless steel (nickel free), was employed to determine not only the number of cycles to failure but particularly to aid in the understanding of the mechanical material reaction to the multiaxial stresses as well as modes of crack formation and growth. Experimental test results indicate that strain hardening occurs under the compressive strain, while at the same time cyclic softening is observable in the torsional shear stresses. Furthermore, the cracks’ nature is unusual with multiple branching and presence of cracks perpendicular in direction to the surface cracks, indicative of the varying multiaxial stress states across the samples’ cross section as cross slip is activated in different directions. In addition, it is believed that the static compressive stress facilitated the Stage I (mode II) crack to change direction from the axial direction to a plane perpendicular to the specimen’s axis.

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“…Another challenging aspect in multiaxial fatigue is the interaction between shear and normal stress/strain components and their role in causing fatigue damage 8 . To account for these effects, several fatigue damage parameters have been proposed over the years 9–13 . Nonetheless, this challenging issue has remained understudied for wrought magnesium alloys, whose hexagonal close‐packed (HCP) crystal structure can result in the activation of various deformation modes, adding to the complexity.…”

Section: Introductionmentioning

confidence: 99%

“…8 To account for these effects, several fatigue damage parameters have been proposed over the years. [9][10][11][12][13] Nonetheless, this challenging issue has remained understudied for wrought magnesium alloys, whose hexagonal close-packed (HCP) crystal structure can result in the activation of various deformation modes, adding to the complexity.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

Karparvarfard

Roostaei

Behravesh

et al. 2022

Fatigue Fract Eng Mat Struct

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Uniaxial and multiaxial fatigue characteristics of as-extruded and extrudedthen-forged ZK60 magnesium alloys were examined to understand the influence of low-temperature forging on its deformation mechanics. Upon forging, basal texture weakening and grain refinement occurred in ZK60 extrusion. Based on uniaxial results, forging process led to improvements in quasi-static tensile strength and axial cyclic response in high-cycle fatigue regime, whereas shear responses remained unaffected. Biaxial non-proportional tests demonstrated that changing phase angle shift between axial and torsional waveforms had no effect on cyclic axial response, contrary to the shear response. Lastly, critical-plane and energy-based life prediction models were assessed.

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A path-dependent multiaxial fatigue life estimation criterion for metals under various loading conditions

Cited by 13 publications

References 78 publications

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Mechanical Behaviour and Failure Mode of High Interstitially Alloyed Austenite under Combined Compression and Cyclic Torsion

Multiaxial fatigue behavior of low‐temperature closed‐die forged ZK60 extrusion under proportional and non‐proportional loading

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