Application of Probabilistic Approach to Investigate Influence of Details in Time History of Temperature Changes on the HCF Life of Integrated Bridge Steel Piles Installed on Water

Kashyzadeh, Kazem Reza; Abdollahnia, Hamid; Elizei, Mohammad Hadi Alizadeh

doi:10.3390/jmse10121802

Cited by 3 publications

(5 citation statements)

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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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“…According to the results presented by scholars, and as is clear from the title of the current article, the most critical areas of integrated bridges are the middle steel piles, which are the main focus of this research [1,2,4,16,30]. Therefore, an IPE-220 steel beam was prepared according to the characteristics presented in the previous study [1]. Afterward, axial fatigue test specimens related to the high-cycle regime were fabricated based on the ASTM standard [31].…”

Section: Experimental Workmentioning

confidence: 99%

“…Based on previous studies [1,16,30], the concrete parts of the bridge are made of ordinary concrete and the metal parts are made of St52 steel. The temperature changes and subsequent expansion and shrinkage of the bridge deck are not considered and the main focus is on the impact of sea waves.…”

Section: Finite Element Analysismentioning

confidence: 99%

“…throughout the route from the origin to the destination. In the meantime, due to various reasons including shortening the length of the road and passing through the heart of the mountain, etc., engineers are forced to use bridges as one of the key components of road construction [1]. In general, these bridges are used to connect two paths separated by different factors such as mountains, valleys, and water, etc.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Conventional Shot Peening Treatment on the Service Life Improvement of Bridge Steel Piles Subjected to Sea Wave Impact

Reza Kashyzadeh,

Chizari

2023

JMSE

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The first goal of the current study is to estimate the fatigue life of the middle steel piles of an integrated bridge installed in water and subject to the impact of sea waves. In the following, the authors have tried to improve the service life of this critical part of the bridge, which is also the main purpose of the study. To this end, conventional shot peening, as one of the most well-known surface treatments, was used. Axial fatigue tests were performed on samples fabricated from IPE-220 steel piles in two states without and with shot peening surface treatment. Next, the modified S-N curve was entered into the finite element software to define the effect of shot peening treatment. Different analysis, including thermal, thermal-structural coupled, and transient dynamic, were performed and various outputs were extracted for the entire structure. In all these analyses, changes in air temperature have been neglected. The most important achievement of this research is the discovery that motionless water cannot cause serious damage to steel piles. Moreover, application of conventional shot peening can increase the fatigue life of steel piles, or in other words the service life of the bridge, subjected to the impact of sea waves by about 22%.

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“…Prepare to dive deep into the fascinating realm of failure analysis, where mysteries are unraveled, and solutions emerge to repair and safeguard against future calamities [1]. This remarkable edition delves into a myriad of industrial conundrums, from awe-inspiring bridges that stand proud upon the water's surface [2,3], to the intricate network of oil and gas transmission pipelines [4,5]. Brace yourself for the adrenaline-pumping exploration of vehicles hurtling through aquatic realms at breakneck speeds [6], as well as the enigmatic realm of offshore cables [7].…”

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confidence: 99%