Investigation of In-service Creep Failures of Aircraft Ti-6Al-4V Bolts

Spyroglou, Iordanis; Kourousis, Kyriakos I.; Koutsomichalis, Angelos

doi:10.1051/matecconf/201818804008

Cited by 2 publications

(3 citation statements)

References 15 publications

(16 reference statements)

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“…(3) Applying the spherical reconstruction function to divide the cavity size (R) into two cavities, sizes r1 and r2, using the equations [4.6-4.9]. (4) Step (5) applied in modelling the size distributions between 52 and 196 minutes can be applied for each of r1 and r2 to the size distributions N (r1, t) and N (r2, t). ( 5) The critical value for flatness can be specified, which corresponds to the time when the coalescence starts, representing a value above 2, where the cavity becomes elongated or non-spherical in shape.…”

Section: Modelling Size Distributions From 307 To 440 Minutesmentioning

confidence: 99%

“…Similarly, aircraft engine components such as turbine blades and combustion chambers are prone to creep deformation, which can affect flight safety [3]. Low-temperature creep in aircraft bolts can cause rupture, as revealed by SEM analysis indicating plastic deformation and microvoid coalescence [4]. Creep rupture can have fatal consequences in both aerospace [5], [6], [7] and power plants [8].…”

Section: Introductionmentioning

confidence: 99%

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Accurate determination of creep cavity nucleation rate and growth rate with considering the partial coalescence prior to rupture and its impact on creep lifetime prediction

Abdelrehim,

Lu,

2024

Preprint

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In high-temperature applications such as power generation and aerospace, understanding material failure due to creep deformation is crucial, especially for components like jet engine compressor blades and steam turbines. This study investigates the evolution of creep cavitation damage, focusing on cavity nucleation, growth, and coalescence in the material's microstructure. Beyond nucleation and growth, this study investigates cavity coalescence, an inevitable process leading to microcracks and macrocracks. It captures the evolution of exact cavity measurements. This mechanism is associated with an increasing nucleation rate and a decreasing growth rate of individual cavities. Enhancing the accuracy of tensile creep behaviour models, this study extends the cavitation model initially proposed by Riedel and calibrated by Qiang Xu. It addresses cavity coalescence during late-stage rupture using high-fidelity experimental data and a modelling approach. A spherical reconstruction hypothesis for cavity coalescence is proposed and validated with cavitation data from the brass alloy Cu-40Zn-2Pb. The model demonstrates accuracy for lifetime modelling with an increase of accuracy from traditionally 45–83% and a coefficient of determination from 0.767 to 0.997, highlighting its robustness for describing coalescence and aiding in design and maintenance assessments.

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Section: Modelling Size Distributions From 307 To 440 Minutesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Accurate determination of creep cavity nucleation rate and growth rate with considering the partial coalescence prior to rupture and its impact on creep lifetime prediction

Abdelrehim,

Lu,

2024

Preprint

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“…Bolt and rivet connection is a very important component in fastener installation during MS-21 aircraft assembly [6]. Ti-6Al-4V bolts that experience creep for too long and overload will show a fracture in the aircraft [7]. The Cu 2024 % wt with Sn alloy in aircraft causes the material to become brittle quickly [8].…”

Section: Bolt and Nut Pressure Switchmentioning

confidence: 99%

Characteristic of Bolt and Nut Pressure Switch of Cessna Caravan Type 208B

Suroso

Wicaksono

2023

AMM

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Aircraft components have different functions and characteristics, for example, the bolt and nut pressure switch of Cessna Grand Caravan 208B, which functions to determine the pressure of oil and fuel flowing. At the end of the bolt and nut, there is a small hole to press the sensor in the component, then the result of the pressure will be converted to the system and sent to the indicator located in the cockpit, so the pilot sees the actual in the cockpit. The purpose in this research was to determine the characteristics of the bolt and nut pressure switch. This study used chemical composition, Vickers hardness, and metallographic testing methods. The test results of the chemical composition of bolt and nut on the pressure switch of Cessna Grand Caravan 208B, show that the elements, iron (Fe) = 67.58% and chromium (Cr) = 17.04%, are the dominant elements, therefore it is included as an alloying element of Fe-Cr. The test an average hardness value of 254.64 VHN. These values were obtained from the total percentage of iron 67.58% and chromium 17.04%. Chromium (Cr) is an element that can increase the hardness of carbon steel and increase corrosion resistance. Therefore, the hardness of the bolt and nut pressure switch of Cessna Grand Caravan 208B is high due to the addition of Cr which help the main element, Fe, properties. The novelty of this study is the dominant presence of chromium, so the properties of this material are hard, heat resistant, and corrosion resistant

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Investigation of In-service Creep Failures of Aircraft Ti-6Al-4V Bolts

Cited by 2 publications

References 15 publications

Accurate determination of creep cavity nucleation rate and growth rate with considering the partial coalescence prior to rupture and its impact on creep lifetime prediction

Accurate determination of creep cavity nucleation rate and growth rate with considering the partial coalescence prior to rupture and its impact on creep lifetime prediction

Characteristic of Bolt and Nut Pressure Switch of Cessna Caravan Type 208B

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