High and Ultrahigh Cycle Fatigue

Murakami, Yukitaka

doi:10.1016/b0-08-043749-4/04024-6

Cited by 24 publications

(5 citation statements)

References 64 publications

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“…According to Murakami and other scholars in the field of failure analysis of industrial components, fatigue is responsible for 80 to 90% of fractures [111][112][113][114][115][116][117][118][119], and fatigue cracks are most formed at geometrical discontinuities such as machining holes, notches, slots, gross-sectional transitions, and so on [120]. Fatigue cracks start at the location of the highest local stress/strain in the component and are almost always superficial before growing inside the component.…”

Section: Fatigue Failurementioning

confidence: 99%

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

2023

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Kaplan turbines, as one of the well-known hydraulic turbines, are generally utilized worldwide for low-head and high-flow conditions. Any failure in each of the turbine components can result in long-term downtime and high repair costs. In a particular case, if other parts are damaged due to the impact of the broken blades (e.g., the main shaft of the turbine), the whole power plant may be shut down. On the other hand, further research on the primary causes of failures in turbines can help improve the present failure evaluation methodologies in power plants. Hence, the main objective of this paper is to present the major causes of Kaplan turbine failures to prevent excessive damage to the equipment and provide practical solutions for them. In general, turbines are mainly subjected to both Internal Object Damage (IOD) and Foreign Object Damage (FOD). Accordingly, this paper presents a state-of-the-art review of Kaplan turbine failures related to material and physical defects, deficiencies in design, deficits in manufacturing and assembly processes, corrosion failures, fatigue failure, cavitation wear, types of cavitation in hydro turbines, hydro-abrasive problems, and hydro-erosion problems. Eventually, the authors have attempted to discuss practical hints (e.g., nanostructured coatings) to prevent damages and improve the performance of Kaplan turbines.

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Section: Fatigue Failurementioning

confidence: 99%

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

2023

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“…Where it was discovered that movement caused by fatigue accounts for 80-90% of service failures in metal components. Thus, there are three steps to fatigue failure: crack initiation, crack propagation, and fracture [2][3]. Because they can provide extra features like high strength, thermal barrier, and corrosion, surface engineering techniques have attracted a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

Carbonitriding Effect on Fatigue Behaviour and Mechanical Properties of Steel Beam

Nasser,

Bader,

Mohammad

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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This work deals with the influence of carbonitriding on the fatigue behavior of notched beam (v-notch) with a depth of 1mm and an angle of 45° is studded. The experimental work include mechanical tests, heat treatments and fatigue test. The heat treatment is done by using carbonitriding at a constant temperature of 800 °C, and soaking time variation 30, 60, and 90 minutes, then followed after treatment by quenching of water and tempering process. The experimental fatigue test results of this work affected by soaking time. The fatigue test has been performed on a cantilever rotating-bending samples. The result shows that the fatigue strength and lifetime increased with increasing soaking time. It is found that The Fatigue Life Improvement Factor (FLIF) at time 30, 60 and 90 minutes for notched beam (v-notch) was increasing by 11.3%, 18.6% and 20.2% respectively with respect to un-treat specimens.

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“…In engineering, fatigue is responsible for more than 80% of fracture failures (Murakami et al, 2003), making it one of the most prevalent failure modes. The concept of "fatigue" was first introduced by Braithwaite (Braithwaite, 1854) in 1854, and research in this area has spanned over a century.…”

Section: Introductionmentioning

confidence: 99%

Fatigue fracture failure analysis of guide valve based on welding defects

Du,

Liu,

et al. 2023

Front. Mater.

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This research paper presents a failure analysis conducted on the guide valve located at the bottom of the primary outlet buffer tank in the reciprocating machine of the diesel hydrogenation unit during its operation. Various methods, including in situ observation, macroscopic fracture analysis, metallographic analysis, microscopic fracture observation, material composition analysis, and hardness testing, were employed to investigate the cause of the failure. The findings indicate that the failure resulted from insufficient fusion between the valve body and the flange of the guide shower valve during the manufacturing and welding process. This lack of fusion led to fatigue failure of the weld during operation, ultimately resulting in valve cracking and detachment. The presence of fatigue failure is widespread and poses a significant threat in petrochemical plants and their surrounding environments, given the equipment’s exposure to alternating working conditions and vibrations. This failure analysis serves as a valuable reference for future quality inspections of petrochemical equipment parts. Additionally, it assists enterprises in mitigating risks throughout the design, installation, and maintenance processes, thereby reducing the likelihood of similar accidents occurring.

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High and Ultrahigh Cycle Fatigue

Cited by 24 publications

References 64 publications

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

Common Failures in Hydraulic Kaplan Turbine Blades and Practical Solutions

Carbonitriding Effect on Fatigue Behaviour and Mechanical Properties of Steel Beam

Fatigue fracture failure analysis of guide valve based on welding defects

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