Dent-repaired fatigue performance and life prediction of thin sheet specimens under coupled multi-stage damage with impact and pre-fatigue

Ji, Chuan; Chen, Yajun; Yang, Jinchuan; Wang, Bing; Sun, Yi

doi:10.1016/j.ijfatigue.2021.106148

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…Accurately calculate the stress intensity factor (SIF) of repaired cracked panels with various shape patches [15]. In 2021, Ji Chunming used different combinations of fatigue, impact and repair damage to simulate the actual service conditions of aircraft, and proposed a life prediction model based on strain distribution and damage accumulation theory [16]. In 2022, Song Zhou studied the fatigue crack propagation behavior of the laser deposition repair of TA15 titanium alloy with the reliability of the laser deposition repair of aviation parts as the research object [17].…”

Section: Introductionmentioning

confidence: 99%

Studying a Repair Method of LY12 Aluminum Alloy Plate

Lv,

Wang,

Yang

et al. 2023

Metals

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The difference in the strengthening effect of different thickness reinforcement plates on an LY12 aluminum alloy central defect plate and the load distribution between the reinforcement plate and central defect plate in the reinforcement plate structure were studied. Through a method of equivalent transverse load in a small interval [a + Δa], the equivalent cyclic load of the central defect plate in the reinforced plate structure under different crack lengths was calculated, and then the distribution of the internal load of the reinforced plate structure with a different thickness with the crack propagation was solved. The secondary development program of the finite element software Abaqus was written in Python language, so that Abaqus software can solve the problem of high cycle fatigue. The finite element simulation of the different thickness-reinforced plate structure is carried out by this program. Through the output data, the equivalent cyclic load of the central defect plate in the reinforced plate structure under different crack lengths is calculated. Through three different fitting methods, the mathematical relationship between the equivalent cyclic load Δσ and the crack length a at both ends of the central defect plate in the reinforced plate structure is described. Based on the mathematical relationship and the finite element output data, the fatigue crack propagation life of the reinforced plate structures with different thicknesses is calculated. It is found that, under the same crack conditions, with the increase in the thickness of the reinforced plate, the bearing load of the cracked plate decreases and the life of the cracked plate increases. With the expansion of the crack, the bearing load ratio of the reinforced plate increases. The simulation method is compared with the experimental results to verify its effectiveness.

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Section: Introductionmentioning

confidence: 99%

Studying a Repair Method of LY12 Aluminum Alloy Plate

Lv,

Wang,

Yang

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…Moreover, a large number of researchers have studied the effects of indenter shape (such as spherical, conical, and U-shape) [8,9], dent depth [2,[8][9][10], impactor diameter [9], impact modes (such as a single impact, continuous twice-impacts at the same position and impacts at two parallel positions) [10], coupled damage with impact and pre-fatigue [11], dent repairing (such as rotary peening [7], quasi-static compression of the dent [11] and hammer manual reworking [12,13]) on the post-impact fatigue behaviours of aluminium-alloy thin-sheets. It has been revealed that conical dent damage leads to the greatest reduction in the fatigue life of 2024-T3 aluminium-alloy thin-sheets under constant amplitude tension-tension fatigue loads, followed by the U-shape dent damage, and then spherical dent damage [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…With the increase of the dent damage volume caused by the aforementioned three impact modes, the fatigue life of 2198-T8 aluminium-lithium alloy thin-sheets gradually decreases [10]. Dent repairing promotes the redistribution of the strain field on the surface of the specimen and effectively reduces the uneven distribution of residual strain and stress concentration caused by LVI, so it delays the initiation of micro-cracks at the dent edge area and can effectively restore the fatigue life of the aluminium-alloy thin-sheets [11][12][13]. However, the recovery extent of fatigue life is related to the fatigue stress level.…”

Section: Introductionmentioning

confidence: 99%

“…Dent repairing can bring the fatigue life back to its original level at the lower fatigue stress, but it does not improve the fatigue life at the higher fatigue stress [7]. For pre-fatigue specimens with micro-cracks, dent repairing could not restore fatigue life but will magnify the microcracks caused by pre-fatigue damage due to impact and repair, further reducing the fatigue life of aluminium-alloy thin-sheets [11].…”

Section: Introductionmentioning

confidence: 99%

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