Experimental and Finite Element Analysis of Natural Modes and Frequencies of Hollow Fan Blades

Nikhamkin, Mikhail; Болотов, Б П

doi:10.4028/www.scientific.net/amm.467.306

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The first modal test of each sample was carried out before fatigue tests. The modal tests were performed by the scanning laser vibrometry technique [19][20][21] using laser vibrometer PSV-400-3D. The principal advantage of the technique is the non-contact measurement and the ability to find a large number of eigenmodes and natural frequencies with high accuracy.…”

Section: Experimental Techniquementioning

confidence: 99%

Change of the Elastic Characteristics of a Fiber-Reinforced Laminate as a Result of Progressive Fatigue Damage

Nikhamkin

Solomonov

2021

SSP

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It is a widely known fact that the stiffness of polymer composite materials decreases with the accumulation of fatigue damage under cyclic loading. The purpose of this article is to develop a method and obtain experimental data on decrease of the elastic characteristics of a fiber-reinforced laminate, as a result of progressive fatigue damage. The developed technique consists of two stages. At the first one, the natural frequencies and eigenmodes of the samples during their fatigue testing are experimentally obtained. The dependences of the natural frequencies of the samples on the number of loading cycles are found. At the second stage, the four elasticity parameters of the laminate monolayer (two Young modules, the shear module and Poisson's ratio) are identified via the natural frequencies. The inverse numerical/experimental technique for material properties identification is applied. The dependences of the natural frequencies and mentioned elastic characteristics on the relative fatigue life are obtained as experimental results of both modal and fatigue tests. The results can be useful to study the fatigue behavior of the investigated materials and to create methods for calculating fatigue life.

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Section: Experimental Techniquementioning

confidence: 99%

Change of the Elastic Characteristics of a Fiber-Reinforced Laminate as a Result of Progressive Fatigue Damage

Nikhamkin

Solomonov

2021

SSP

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“…Many researchers focus on the stress response and structural strength of the wide-chord hollow blade (Zhang et al, 2009;Zheng and Yang, 2011;Nikhamkin and Bolotov, 2014). Teichman and Tadros (1991) designed and carried out the experiments to record large blade deformations during bird impact and validated and calibrated the analytical models.…”

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confidence: 99%

Mechanical response analysis of the wide-chord hollow fan blade considering the fluid–structure interaction

Zhang,

Wang,

et al. 2024

Front. Energy Res.

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The aero-engine wide-chord hollow fan blade with a cavity stiffener structure can effectively reduce the weight and greatly increase the rotational speed. However, during the high-speed rotation process of the hollow fan, there is a strong coupling effect between the solid domain of the blade and the incoming air. This effect leads to a certain deformation of the rotor blade, which has a large impact on the structural strength of the blade. Aiming at the problem of the fluid–structure interaction in its operation, the finite-element method was used to simulate the two-layer structure of the TC4 titanium alloy wide-chord hollow fan blade. The centrifugal force and fluid–structure coupling effect were considered when carrying out the research on the structural mechanical characteristics of the blade. The results show that the maximum equivalent stress of the blade considering the fluid–structure coupling effect is 508 MPa at the rotational speed of 2,900 r/min, which is approximately 18% higher than the maximum stress when only the centrifugal force is considered. This phenomenon indicates that the effect of aerodynamic force on the blade stress cannot be ignored. The stress concentration area of the blade is located in the third stiffener from the leading edge and near the root of the blade, and the aerodynamic force has a more significant effect on the radial stress distribution of the blade. Further analysis of the equivalent stress distribution along the blade tip direction shows a trend of first increasing and then decreasing. The maximum equivalent stress appears at a distance of 30 mm up to the bottom of the stiffener.

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Defect-caused alteration of a composite unit modal parameters

2017

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Experimental and Finite Element Analysis of Natural Modes and Frequencies of Hollow Fan Blades

Cited by 5 publications

References 3 publications

Change of the Elastic Characteristics of a Fiber-Reinforced Laminate as a Result of Progressive Fatigue Damage

Change of the Elastic Characteristics of a Fiber-Reinforced Laminate as a Result of Progressive Fatigue Damage

Mechanical response analysis of the wide-chord hollow fan blade considering the fluid–structure interaction

Defect-caused alteration of a composite unit modal parameters

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