A notch critical plane approach of multiaxial fatigue life prediction for metallic notched specimens

Luo, Peng; Yao, Wei; Li, Piao

doi:10.1111/ffe.12956

Cited by 37 publications

(19 citation statements)

References 36 publications

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“…Recently, Luo et al combined the CPA and the TCD for fatigue life prediction of thin‐walled notched specimens with a circular hole. According to the physical mechanism that fatigue crack initiation is dominated by shear stress (slips bands formation), the critical plane is settled as the plane that passes through the fatigue critical point and is defined by the maximal shear stress amplitude.…”

Section: Critical Distance Theory and Its Applications To Fatiguementioning

confidence: 99%

“…Moreover, by combining the TCD and multiaxial fatigue models (like FS 104,105 and Carpinteri criteria 106-108 ), they further developed a model that can incorporate the impact of mean stress into the fatigue strength calculation and noted that LM is overall more accurate than PM, especially in those cases where high stress gradients occur. 109 Recently, Luo et al 110 combined the CPA and the TCD for fatigue life prediction of thin-walled notched specimens with a circular hole. According to the physical mechanism that fatigue crack initiation is dominated by shear stress (slips bands formation), the critical plane is settled as the plane that passes through the fatigue critical point and is defined by the maximal shear stress amplitude.…”

Section: Critical Distance Theory and Its Applications To Fatiguementioning

confidence: 99%

See 1 more Smart Citation

Recent advances on notch effects in metal fatigue: A review

Liao

Zhu

Correia

et al. 2020

Fatigue Fract Eng Mat Struct

162

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Notch features including holes, fillets, shoulders, and grooves commonly exist in engineering components. When subjected to external loads, these geometrical discontinuities generally act as stress raisers and thus present significant influences on the component strength and life, which are more remarkable under complex loading paths. Accordingly, numerous theories and approaches have been developed to address notch effects in metal fatigue as well as damage modelling and life predictions, which aim to provide theoretical support for structural optimal design and integrity evaluation. However, most of them are self‐styled or focus on specific objects, which limits their engineering applicability. This review recalls recent developments and achievements in notch fatigue modelling and analysis of metals. In particular, four commonly used methods for fatigue evaluation of metallic notched components/structures are summarized and elaborated, namely, nominal stress approaches, local stress‐strain approaches, and critical distance theories and weighting control parameters‐based approaches, which intend to provide a reference for further research on notch fatigue analysis and promote the integration and/or development among different approaches for practice.

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Section: Critical Distance Theory and Its Applications To Fatiguementioning

confidence: 99%

Section: Critical Distance Theory and Its Applications To Fatiguementioning

confidence: 99%

Recent advances on notch effects in metal fatigue: A review

Liao

Zhu

Correia

et al. 2020

Fatigue Fract Eng Mat Struct

162

View full text Add to dashboard Cite

show abstract

“…There have been numerous researches on prediction approaches for fatigue life of crack initiation [1,2]. From the view of fatigue damage parameters, these approaches can be divided into stress-based approaches, strain-based approaches and energy density-based approaches.…”

Section: Introductionmentioning

confidence: 99%

Fatigue tests on notched specimens of G20Mn5QT cast steel and life prediction by a new strain-based method

Han

Wang

Yin

et al. 2020

Archiv.Civ.Mech.Eng

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Fatigue performance of notched specimens of G20Mn5QT cast steel was investigated experimentally and analytically. Fatigue tests on a total number of 22 semi-circular notched specimens were conducted with the load ratios of − 1 and 0.1. Nominal stress-fatigue life relationship was obtained, and mean stress correction rules were verified for the notched specimens based on the test results. A new strain-based approach, strain field intensity (SNFI) method, was proposed, in which fatigue life of materials is predicted based on the weighted average strain in the fatigue damage region. The fatigue lives of the test specimens were predicted using three strain-based approaches, modified Neuber's rule, equivalent strain energy density (ESED) method and the proposed SNFI method. The fatigue life prediction by the SNFI method was in very good agreement with the test results, which verified the rationality and applicability of the proposed SNFI method and also the adopted fatigue properties of G20Mn5QT cast steel. Both the modified Neuber's rule and the ESED method gave conservative prediction of the fatigue life of the notched specimens. The necessity of the 3-dimensional fatigue damage region was also discussed for the proposed SNFI method. Keywords Fatigue life prediction • Strain field intensity method • G20Mn5QT cast steel • Fatigue tests • Notched specimens List of symbols b Fatigue strength exponent c Fatigue plastic exponent E Elastic modulus K ′ Cyclic hardening coefficient K f Fatigue notch factor K t Theoretical stress concentration coefficient n ′ Cyclic hardening exponent N in f

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“…Although the calculation process is simple, the characteristics of non‐proportional fatigue loading are not considered in this way. Many fatigue tests have shown that the fatigue critical point of notched components under multiaxial fatigue loading is obviously different from that under uniaxial fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Prediction methods of fatigue critical point for notched components under multiaxial fatigue loading

Luo

Yao

Susmel

et al. 2019

Fatigue Fract Eng Mat Struct

Self Cite

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Two methods based on local stress responses are proposed to locate fatigue critical point of metallic notched components under non‐proportional loading. The points on the notch edge maintain a state of uniaxial stress even when the far‐field fatigue loading is multiaxial. The point bearing the maximum stress amplitude is recognized as fatigue critical point under the condition of non‐mean stress; otherwise, the Goodman's empirical formula is adopted to amend mean stress effect prior to the determination of fatigue critical point. Furthermore, the uniaxial stress state can be treated as a special multiaxial stress state. The Susmel's fatigue damage parameter is employed to evaluate the fatigue damage of these points on the notch edge. Multiaxial fatigue tests on thin‐walled round tube notched specimens made of GH4169 nickel‐base alloy and 2297 aluminium‐lithium alloy are carried out to verify the two methods. The prediction results show that both the stress amplitude method and the Susmel's parameter method can accurately locate the fatigue critical point of metallic notched components under multiaxial fatigue loading.

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A notch critical plane approach of multiaxial fatigue life prediction for metallic notched specimens

Cited by 37 publications

References 36 publications

Recent advances on notch effects in metal fatigue: A review

Recent advances on notch effects in metal fatigue: A review

Fatigue tests on notched specimens of G20Mn5QT cast steel and life prediction by a new strain-based method

Prediction methods of fatigue critical point for notched components under multiaxial fatigue loading

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