A new approach for evaluating fatigue lives of multi-fastener mechanical joints based on a nominal stress concept and minimal datasets

Tian, Baofeng; Xiong, Jun-Jiang; Liu, J.Z.

doi:10.1016/j.ijfatigue.2015.06.013

Cited by 23 publications

(7 citation statements)

References 18 publications

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“…However, experimental results cannot be directly applied to fatigue damage analysis of notched structures, because the notch geometries and stress conditions are usually more complex and obviously different from the standard specimens. Literature review show that some local methods, including the nominal stress method (Tian et al., 2015), local stress-strain approach (Al and Susmel, 2017) and critical plane technique (Gates and Fatemi, 2018; Xue et al., 2020), can be employed in the fatigue life prediction of notched structures. However, these methods only use local damage parameter, and the effects of stress/strain gradient and fatigue damage evolution process are often ignored.…”

Section: Introductionmentioning

confidence: 99%

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Gao

Yang

Zhan

et al. 2022

International Journal of Damage Mechanics

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In this study, a non-local approach is developed for the fatigue life prediction of notched specimens, considering stress/strain gradient and elastic-plastic fatigue damage. The damage coupled constitutive models are presented to model the mechanical behavior of material. The critical plane method and triaxiality factor are employed to determine the location of the couple point. The gradient values of mechanical quantities are then computed, and the modified coefficients in damage models are acquired. The numerical simulations are implemented to compute the damage evolution process and predict fatigue life. Meanwhile, the coupling effects between stress field and damage field are considered. The predicted results are verified by experimental data, and also compared with the local method. Finally, the influence of stress concentration factor, shape of notch, and cyclic variation of stress/strain gradient are further investigated.

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Section: Introductionmentioning

confidence: 99%

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Gao

Yang

Zhan

et al. 2022

International Journal of Damage Mechanics

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“…In addition, a variety of correction factors or curves are needed in existing approaches for predicting the fatigue life of post‐impacted sheets to account for the effects of residual stress and stress concentration. One drawback of the existing approaches is the intensity and complexity in determining and evaluating these correction factors or curves when considering the effects of impact dents by using a large amount of detailed experimental data or analysis 33,34 . In reality, because of the high experimental cost, it is challenging and impracticable to generate the detailed experimental data or analyses to comprehensively evaluate the effects of residual stress and stress concentration.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life prediction of 2524‐T3 and 7075‐T62 thin‐sheet aluminium alloy with an initial impact dent under block spectrum loading

Chen

Cheng

Cunningham

et al. 2021

Fatigue Fract Eng Mat Struct

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This paper presents a fatigue life prediction model of post‐impacted sheets considering the effects of dent size and stress ratio. Low‐velocity impact tests at four different impact energies were performed on specimens cut from sheets of 2524‐T3 and 7075‐T62 aluminium alloy. Following the impact tests, static tensile and uni‐axial constant amplitude and block spectrum fatigue experiments were conducted. Numerical models were generated to determine the initial residual stress patterns, residual stress relaxation, and stress concentration factors around the impact dent. The S‐N curves and corresponding stress concentration factors and relaxed residual stresses of three of the post‐impacted specimens were used to determine the model parameters. Good agreement was achieved between the predictions and experimental results, and it has been demonstrated that the fatigue life prediction model can effectively simulate the effects of residual stress, stress concentration, and stress ratio on fatigue damage for post‐impacted thin sheet aluminium alloy materials.

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“…10 1. Fatigue life assessment method based on S-N curve and fracture mechanics According to the relationship between fatigue life and evaluation parameters, the fatigue life assessment methods based on S-N curve can be divided into the nominal stress method, 11 structural hot spot stress method, 12 local stress-strain method, 13 and equivalent structural stress method. 14 As described in Xiong et al, 15 with the hoisting wire rope of 32 t-42 m double girder bridge crane being taking as an example, the nominal stress method and the local stress-strain method are utilized to estimate the residual fatigue life of wire rope under the rated load and average load.…”

Section: Introductionmentioning

confidence: 99%

Real‐time prediction method of fatigue life of bridge crane structure based on digital twin

Dong

et al. 2021

Fatigue Fract Eng Mat Struct

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The comprehensive effect of multiple factors that include the geometric characteristics, load status, service characteristics, and failure mechanism will affect the safety of bridge crane structure. To evaluate the security of the bridge crane structure, the real‐time prediction method of fatigue life of the bridge structure based on digital twin is proposed. The specific type of general bridge crane is selected as the physical entity of the research object, and the information acquisition system is utilized to get the current service status information about the physical entity. On this basis, combined with the historical service information and inherent information of physical entity, the fuzzy database is established. Meanwhile, twin data are formed by the clear quantification of fuzzy information and data processing technology. In accordance with structural characteristic and work cycle process of bridge crane, the analytical models of load, strength, defect, and fatigue life are established, respectively. The multi‐theoretical calculation model is completed by encapsulating the analysis models and transmitting information, and then the main factors affecting the fatigue life of bridge crane structure are determined. With that, the comprehensive evaluation coefficient is calculated by the fuzzy comprehensive evaluation theory. The response relationship between the information data and the fatigue life of bridge crane structure is described by the Kriging surrogate model constructed with experimental design. Real‐time prediction of fatigue life of bridge crane structure is realized in a virtual space to depict the life cycle process. Taking QD20/10 t × 43 m × 12 m general bridge crane as an example, the feasibility and applicability of the proposed method are verified, which provides a strong theoretical basis for dependable service and timely scrapping of cranes.

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A new approach for evaluating fatigue lives of multi-fastener mechanical joints based on a nominal stress concept and minimal datasets

Cited by 23 publications

References 18 publications

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Development of a non-local approach for life prediction of notched specimen considering stress/strain gradient and elastic-plastic fatigue damage

Fatigue life prediction of 2524‐T3 and 7075‐T62 thin‐sheet aluminium alloy with an initial impact dent under block spectrum loading

Real‐time prediction method of fatigue life of bridge crane structure based on digital twin

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