Prediction of Maximum Fatigue Indicator Parameters for Duplex Ti-6Al-4V Using Extreme Value Theory

Gu, Tang; Stopka, Krzysztof S.; Xu, Chuan

doi:10.2139/ssrn.3499072

Cited by 2 publications

(3 citation statements)

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“…85 In a dwell fatigue test, the decrease of load-up rate enables more plastic deformation established during load-up stage, thus less load shedding during the load hold. 84 Stress, strain, or FIPs were observed to stabilize after 3-10 cycles during pure or dwell fatigue loads, 20,86,87 and cycle number of 50 is chosen here to obtain fully saturated or stabilized FIPs for both loading conditions in Figure 4A,B. Figure 4C shows two neighboring grains, A and B, in the middle of exemplary SVE from calibration in Figure 2D.…”

Section: Bicrystal Validation Of MDmentioning

confidence: 99%

“…Stress, strain, or FIPs were observed to stabilize after 3–10 cycles during pure or dwell fatigue loads, 20,86,87 and cycle number of 50 is chosen here to obtain fully saturated or stabilized FIPs for both loading conditions in Figure 4A,B. Figure 4C shows two neighboring grains, A and B, in the middle of exemplary SVE from calibration in Figure 2D.…”

Section: Fipsmentioning

confidence: 99%

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A comparative study on fatigue indicator parameters for near‐α titanium alloys

Liu

Zhang

Oskay

2022

Fatigue Fract Eng Mat Struct

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Nucleation of in‐service cracks leads to detrimental consequences for structural components of near‐α titanium alloys subjected to fatigue loads. Experimental observations show that the fatigue initiation facets usually form in certain crystallographic orientation ranges of “hard” primary α grains which differ between pure and dwell fatigue loads. In this manuscript, a comparative study has been performed using several fatigue indicator parameters (FIPs) to assess their ability to predict the location of fatigue crack nucleation in near‐α titanium alloy microstructures. All selected FIPs are implemented within the same polycrystalline plasticity finite element modeling framework to facilitate one‐to‐one comparisons. Comparison on predictability of critical initiation locations and their crystallographic orientations is studied for incorporated FIPs under pure and dwell fatigue. The critical locations predicted by some FIPs were found to be close to each other, and consistent with the crystallographic orientation ranges from fractography measurements, in addition to the range transition from pure to dwell fatigue loads. Critical locations from slip driven FIPs are obtained to be several grains away from that of the former ones and are inclined to capture orientations of slip traces from experiments.

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Section: Bicrystal Validation Of MDmentioning

confidence: 99%

Section: Fipsmentioning

confidence: 99%

A comparative study on fatigue indicator parameters for near‐α titanium alloys

Liu

Zhang

Oskay

2022

Fatigue Fract Eng Mat Struct

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“…In recent years, finite element method is an outstanding tool for multiaxial fatigue analysis and prediction at the microlevel. [25][26][27][28][29] Castelluccio et al 30 found that the grain size and texture of representative volume elements (RVEs) can affect the local ductility and induce a nonnegligible multiaxial plastic deformation. Lu et al 31 also found that the grains characteristics of RVE would affect its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Cyclic stress–strain response and crystal plasticity finite element analysis of AISI 9310 steel in biaxial fatigue loading

Liang

Pei

et al. 2022

Fatigue Fract Eng Mat Struct

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There are still many gaps in the research on the multiaxial fatigue failure mechanism of the gear shaft. In this paper, cyclic stress–strain response and biaxial fatigue damage characteristics of gear steel AISI 9310 were investigated. The specimens showed obvious cyclic softening characteristics at all phase angles, and the softening rate was directly associated with the initiation and propagation of cracks. The fractographies at different phase angles revealed that the specimens under out‐of‐phase loading suffered fatigue failure caused by a single crack source on the surface, while the fatigue crack under in‐phase loading was gathered together by the propagation of different crack sources. Finally, the established crystal plastic finite element model showed a good prediction of the plastic strain energy density at different phase angles, and the maximum error was 13.03%. Furthermore, a biaxial fatigue life prediction method was proposed, with a maximum error of 39.5%.

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Prediction of Maximum Fatigue Indicator Parameters for Duplex Ti-6Al-4V Using Extreme Value Theory

Cited by 2 publications

References 0 publications

A comparative study on fatigue indicator parameters for near‐α titanium alloys

A comparative study on fatigue indicator parameters for near‐α titanium alloys

Cyclic stress–strain response and crystal plasticity finite element analysis of AISI 9310 steel in biaxial fatigue loading

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