Application of modified Locati method in fatigue strength testing of a turbo compressor blade

Braut, Sanjin; Tevčić, Marina; Butković, Mirko; Božić, Željko; Žigulić, Roberto

doi:10.1016/j.prostr.2021.03.007

Cited by 13 publications

(3 citation statements)

References 18 publications

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“…Another technique for simulating vacuum conditions is the application of beeswax or paraffin oil [15]. The fatigue tests were performed on the notched specimens according to the step loading procedure described by Nicholas in [29], which enables obtaining preliminary results in a fast way, similarly to the Locati method [30,31]. The step loading procedure consists of the sequential implementation of load blocks on the specimen.…”

Section: Methodsmentioning

confidence: 99%

Strength of notched Ti-6Al-4V specimens not subjected to solution treatment and over-aging under cyclic loading

Arcieri

Baragetti

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Ti-6Al-4V alloy is a popular titanium alloy due to its high strength / density ratio, high toughness, superior corrosion resistance and good biocompatibility. After forming operations, Ti-6Al-4V is typically subjected to Solution Treatment and Over-Aging (STOA). Fatigue is one of the most frequent causes of failure in mechanical components. The prediction and optimization of the strength of structural components under cyclic loads therefore plays a strategic role and must take into consideration the presence of defects. The aim of the work is to investigate the axial fatigue behaviour of Ti-6Al-4V alloy not subjected to STOA in inert environment in the presence of notches. The experimental results agree well with the results obtained using the Haigh diagram.

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Section: Methodsmentioning

confidence: 99%

Strength of notched Ti-6Al-4V specimens not subjected to solution treatment and over-aging under cyclic loading

Arcieri

Baragetti

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…However, sporadic incidents of turbine blade failures have led to power plant shutdowns and significant financial losses [2][3][4][5]. Failure analysis of many low-pressure last-stage blades of steam turbines revealed that these blades experienced the combined effects of huge centrifugal forces, alternating steam loads, and vibrations during service [6][7][8][9][10][11]. Therefore, the blade material must possess good toughness, strength, and corrosion resistance to withstand such complex service environments.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Shock Peening on the Fatigue Life of 1Cr12Ni3Mo2VN Steel for Steam Turbine Blades

Tang,

Gao,

et al. 2023

Coatings

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In the present study, laser shock peening (LSP) was employed to enhance the rotating bending fatigue life of 1Cr12Ni3Mo2VN martensitic stainless steel used in steam turbine blades, addressing the issue of insufficient fatigue performance in these components. The aim of this study was to investigate the effect of LSP on the microhardness, residual stress, and rotating bending fatigue life of 1Cr12Ni3Mo2VN steel samples. The microhardness of LSP-treated samples was increased by 10.5% (LSP-3J sample) and 15.3% (LSP-4J sample), respectively, compared to high-frequency hardening samples. The residual compressive stress of the LSP-4J sample was the largest, reaching −689 MPa, and the affected layer depth was about 800 μm. Fatigue tests showed that the number of cycles at the fracture point for the LSP-3J and LSP-4J samples increased by 163% and 233%, respectively. The fatigue fracture morphology of the four samples showed that the microhardness and residual compressive stress distribution introduced by LSP could effectively inhibit the initiation of surface cracks, slow down the crack growth rate, and improve the rotating bending fatigue life of 1Cr12Ni3Mo2VN.

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“…Due to mentioned loads the torsional and transverse vibrations of a shaft line are expected, having the influence on fatigue [7][8][9] as well as fractural [10,11] behavior of shaft line system.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Ship Propulsion Shafting Vibration Using Coupled Torsional-Bending Model

Marijančević,

Braut,

Žigulić

2022

JMTS

Self Cite

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The paper describes a coupled torsional-bending model of ship propulsion system vibrations. The developed model is based on the modified model of the Jeffcott rotor. In order to test the model and determine the coupled torsional-bending vibrations, several cases were analyzed. First, a reference case corresponding to a fully axisymmetric ship propulsion system is set up. Then, the influence of the constant radial force in the vertical direction at the position of the stern bearing was analyzed, such as the conditions of navigation of the ship at calm sea under partial or fully loaded hull. Finally, the case of sailing on rough sea is analyzed, when the propeller racing occurs due to the stern lifting out of the sea. For simplicity, the harmonic law of amplitude changing of the vertical radial force on the stern tube bearing as well as of the propeller load was adopted. Based on the results of numerical analysis, it was found that the proposed model well describes the case of coupling of torsional and bending vibrations of the propulsion system.

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Application of modified Locati method in fatigue strength testing of a turbo compressor blade

Cited by 13 publications

References 18 publications

Strength of notched Ti-6Al-4V specimens not subjected to solution treatment and over-aging under cyclic loading

Strength of notched Ti-6Al-4V specimens not subjected to solution treatment and over-aging under cyclic loading

Effect of Laser Shock Peening on the Fatigue Life of 1Cr12Ni3Mo2VN Steel for Steam Turbine Blades

Analysis of Ship Propulsion Shafting Vibration Using Coupled Torsional-Bending Model

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