Introduction of Developing Fatigue Load Spectrum for Full-Scale Fatigue Test of Composite Aircraft

Joo, Young-Sik; Lee, Wonjun; Seo, Bohwi; Lim, Seung-Gyu

doi:10.1007/s42405-020-00257-8

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…[9][10][11][12] (2) The SLTLs were selected as percentages of the maximum load in the spectrum, which were usually in the range of 5%-30%. [13][14][15][16] The two means are essentially the same. In addition, the SLTLs of damage tolerance verification test spectra are generally lower than those of durability verification test spectra, and the selection criterion of SLTLs is based on the fatigue crack propagation law.…”

Section: Introductionmentioning

confidence: 92%

“…The existing SLTLs were mostly selected based on the above experience and referring to the relevant test results, which can be divided into two means: (1) The SLTLs were selected as percentages of the fatigue limit of structural material, which were mostly in the range of 50%–100% 9–12 . (2) The SLTLs were selected as percentages of the maximum load in the spectrum, which were usually in the range of 5%–30% 13–16 . The two means are essentially the same.…”

Section: Introductionmentioning

confidence: 99%

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A selection criterion of small load truncation level based on the principle of same distribution of fatigue life

Cao

Yao

2023

Fatigue Fract Eng Mat Struct

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A new criterion of selecting the small load truncation level for simplification of fatigue test spectrum was developed, which is based on the principle that the truncated spectrum has the same fatigue life distribution as the original spectrum. Considering the influence of uncertainties of material fatigue performance and load spectrum on the fatigue life distribution, the relation between the distribution difference and the small load truncation level was established. According to the designed tolerance value of distribution difference, the appropriate small load truncation level could be determined accordingly. The selection criterion was verified by the fatigue tests of LC4CS aluminum alloy smooth sheet specimens. The results show that good simplification effect of spectrum can be achieved based on the criterion.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

A selection criterion of small load truncation level based on the principle of same distribution of fatigue life

Cao

Yao

2023

Fatigue Fract Eng Mat Struct

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Research on Equivalent Wind Load Spectrum Acquisition and Remaining Fatigue Strength Method of Double Active Arm Type Holding Pole

Liu,

Zhang,

2024

Lecture Notes in Mechanical Engineering

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In order to study the wind load fatigue residual strength in in-service holding poles for preventing disasters, and improving load-bearing capacity reliability. Firstly, using the Davenport wind speed spectrum to simulate the wind speed, it will be the input load of the finite element dynamics model of the 2 × 40 kN double active arm type holding pole (DAATHP). The stress time history curve at the welding section of the main chord at the bottom of the tower shaft is obtained at the working condition with the wind angle of 0°, 45°, 90°, and 135°. The rain flow counting method derives the statistical characteristics of the mean, amplitude, and frequency of stress at four wind angles. Secondly, the frequency of wind load under four wind angles is extended, and the synthesized fatigue load spectrum is used as the equivalent wind load spectrum. Finally, the Paris-Eadogan equation is used to derive the calculation formula of fatigue residual strength of the main chord at the bottom of the tower shaft, and the functional function of the main chord is established and then the failure probability formula is derived by combining the equivalent wind load spectrum. It is found that, compared with the ANSYS calculation results, the error of the predicted stress spectrum of the proposed method is minor, only 7.95%. It is verified that the proposed method can efficiently obtain the equivalent load spectrum of the DAATHP. The results indicate that it is feasible and practical to apply the proposed method to calculate the remaining fatigue life of the DAATHP.

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On the natural frequency analysis of the shear deformable aircraft wing using an FE-based multilayered FGM model

Amir,

Kim,

Kim

et al. 2024

J Mech Sci Technol

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Introduction of Developing Fatigue Load Spectrum for Full-Scale Fatigue Test of Composite Aircraft

Cited by 7 publications

References 4 publications

A selection criterion of small load truncation level based on the principle of same distribution of fatigue life

A selection criterion of small load truncation level based on the principle of same distribution of fatigue life

Research on Equivalent Wind Load Spectrum Acquisition and Remaining Fatigue Strength Method of Double Active Arm Type Holding Pole

On the natural frequency analysis of the shear deformable aircraft wing using an FE-based multilayered FGM model

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