Life estimation of shafts using vibration based fatigue analysis

Prasad, Sagi Rathna; Sekhar, A. S.

doi:10.1007/s12206-018-0806-4

Cited by 21 publications

(4 citation statements)

References 11 publications

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“…Luo et al [17][18][19] designed a novel testing equipment installed on a triaxial shaker table and implemented a vibration fatigue analysis of notched metallic structures subjected to multiaxial random vibrations. Prasad and Sekhar [20] compared the experimental fatigue life of a notched rotating shaft with an estimated life using traditional S-N curve, time domain and spectral domain methods. Mohamed et al [21] conducted experimental tests to examine the vibration characteristics in two different types of cracks in a long rotor shaft, a notch cut of varying depths and actual crack growth from a pre-crack.…”

Section: Introductionmentioning

confidence: 99%

Notch Fatigue Property of 7050-T7451 Aluminum Alloy under Bending Resonance Environment

HE,

CUI,

LIAO

et al. 2024

mech

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Based on the electromagnetic shaker table, the resonant fatigue testing system and the corresponding conventional fatigue testing system were designed respectively. The fatigue life (S-N) curves of smooth and notched 7050-T7451 aluminum alloy specimens were measured in the range of 105-107 cycles, and the notch fatigue property of 7050-T7451 aluminum alloy under bending resonance environment was studied. The results indicate that the fracture mechanism under bending resonant fatigue environment is roughly the same as that under bending conventional fatigue loading. All the S-N curves obtained through resonant and conventional fatigue tests show a continuously downward trend, and there are no obvious fatigue limits. Notch fatigue property under bending resonance environment presents “stage characteristics”, which increases first and then decreases with the increase of cycles. There is a critical cycle number Nc at 8×105 cycles, corresponding to the maximum fatigue notch factor Kf-max (or the maximum notch sensitivity factor qmax). There are two critical cycles N1 and N2. When N1<N<N2, the notch fatigue property of the material and the corresponding structures under resonance environment requires more consideration than conventional fatigue loading.

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Section: Introductionmentioning

confidence: 99%

Notch Fatigue Property of 7050-T7451 Aluminum Alloy under Bending Resonance Environment

HE,

CUI,

LIAO

et al. 2024

mech

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“…The results led to the conclusion that the vibration simulation realism can be improved with multi-axis vibration testing. Sagi [ 33 ] estimated the fatigue life of a rotating shaft using Dirlik’s method and an experimental analysis. This approach to predicting the fatigue life was indicated as being useful for the rotating shafts.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Vibration Fatigue Behavior of Aircraft Aluminum Alloy 7050

2022

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It has been previously noted that the development of aerospace material technology and breakthroughs are inseparable when obtaining great achievements in the aerospace industry. Materials are the basis and precursor of modern high technology and industry. As one of the most powerful aluminium alloys, 7050 is widely used in the aerospace field. In this manuscript, the vibration fatigue behaviour of aircraft aluminium alloy 7050 is studied based on experiments. A vibration fatigue experiment and the traditional fatigue testing of aluminium alloy 7050 were performed. We found that there was an extreme difference between the vibration fatigue and the traditional fatigue curves. In addition, the experimental end criteria for the vibration fatigue experiment of aluminium alloy 7050 was obtained from the acceleration reduction and the frequency reduction value. For the acceleration experimental end criterion, 2% was the acceleration reduction value for the vibration fatigue experimental end criteria of aluminium alloy 7050. For the frequency experimental end criterion, 2% was the frequency reduction value for the vibration fatigue experimental end criteria of aluminium alloy 7050.

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“…Vibration fatigue analysis differs from traditional fatigue analysis. In vibration fatigue analysis, the modal characteristics and structural dynamics of the structure are considered in dynamic stress simulation [ 39 ].…”

Section: Introductionmentioning

confidence: 99%

Vibration-Based Fatigue Analysis of Octet-Truss Lattice Infill Blades for Utilization in Turbine Rotors

et al. 2022

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Vibration fatigue characteristics are critical for rotating machinery components such as turbine rotor blades. Lattice structures are gaining popularity in engineering applications due to their unique ability to reduce weight and improve the mechanical properties. This study is an experimental investigation of octet-truss lattice structure utilization in turbine rotor blades for weight reduction and to improve vibration fatigue characteristics. One completely solid and three lattice infilled blades with variable strut thickness were manufactured via additive manufacturing. Both free and forced experimental vibration analyses were performed on the blades to investigate their modal and vibration fatigue characteristics. The blades were subjected to random vibration using a vibration shaker. The response was measured using a triaxial accelerometer in terms of vibration acceleration time histories in the X, Y, and Z directions. Results indicate a weight reduction of up to 24.91% and enhancement in the first natural frequency of up to 5.29% were achieved using lattice infilled blades. The fatigue life of the blades was investigated using three frequency domain approaches, namely, Lalanne, Dirlik and narrow band. The fatigue life results indicate that the 0.25 mm lattice blade exhibits the highest fatigue life, while the solid blade exhibits the lowest fatigue life of all four blades. The fatigue life of the 0.25 mm lattice blade was 1822-, 1802-, and 1819- fold higher compared to that of the solid blade, using the Lalanne, Dirlik, and narrow-band approaches, respectively. These results can serve as the first step towards the utilization of lattice structures in turbine blades, with thermal analysis as the next step. Therefore, apart from being light weight, the octet-truss lattice infilled blades exhibited superior vibration fatigue characteristics to vibration loads, thereby making them a potential replacement for solid blades in turbine rotors.

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Life estimation of shafts using vibration based fatigue analysis

Cited by 21 publications

References 11 publications

Notch Fatigue Property of 7050-T7451 Aluminum Alloy under Bending Resonance Environment

Notch Fatigue Property of 7050-T7451 Aluminum Alloy under Bending Resonance Environment

Experimental Study on Vibration Fatigue Behavior of Aircraft Aluminum Alloy 7050

Vibration-Based Fatigue Analysis of Octet-Truss Lattice Infill Blades for Utilization in Turbine Rotors

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