Coil spring failure and fatigue analysis

Pastorčić, Darko; Vukelić, Goran; Božić, Željko

doi:10.1016/j.engfailanal.2019.02.017

Cited by 78 publications

(32 citation statements)

References 15 publications

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“…One of such mechanisms, maybe the most important on ships and similar structures, is fatigue. Fatigue can be defined as a process of damage accumulated during each cycle of the dynamic load that the structure is subjected to with an important characteristic of load intensity lower than the values that would cause immediate failure [7]. Fatigue cracks start and evolve in two phases-formation (usually starting on the material surface) of a shear crack on crystallographic slip planes in the first phase, and growth of the crack in a direction normal to the applied stress in the second phase [8].…”

Section: General Causes and Mechanisms Of Failuresmentioning

confidence: 99%

Marine Propulsion System Failures—A Review

Vizentin

Vukelić

Murawski

et al. 2020

JMSE

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Failures of marine propulsion components or systems can lead to serious consequences for a vessel, cargo and the people onboard a ship. These consequences can be financial losses, delay in delivery time or a threat to safety of the people onboard. This is why it is necessary to learn about marine propulsion failures in order to prevent worst-case scenarios. This paper aims to provide a review of experimental, analytical and numerical methods used in the failure analysis of ship propulsion systems. In order to achieve that, the main causes and failure mechanisms are described and summarized. Commonly used experimental, numerical and analytical tools for failure analysis are given. Most indicative case studies of ship failures describe where the origin of failure lies in the ship propulsion failures (i.e., shaft lines, crankshaft, bearings, foundations). In order to learn from such failures, a holistic engineering approach is inevitable. This paper tries to give suggestions to improve existing design procedures with a goal of producing more reliable propulsion systems and taking care of operational conditions.

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Section: General Causes and Mechanisms Of Failuresmentioning

confidence: 99%

Marine Propulsion System Failures—A Review

Vizentin

Vukelić

Murawski

et al. 2020

JMSE

Self Cite

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“…The decarburized layer was significantly modified by turning into a strengthened layer with gradient microstructure after surface spinning strengthening treatment, which effectively extended the bending fatigue life of spring steel [18]. Darko et al proposed that the continuous contact between the coils formed corrosion pits that served as crack initiation points leading to the final fracture [19]. In another paper, a highspeed camera has been used to capture the deformation of the operating mechanism spring [20].…”

Section: ) Failure Analysis Of Spring Mechanismmentioning

confidence: 99%

Mechanical Condition Identification and Prediction of Spring Operating Mechanism of High Voltage Circuit Breaker

et al. 2020

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Spring operation mechanism is widely used in high voltage circuit breakers, and its reliability is related to the ability of the circuit breaker breaking fault current. During the life cycle of spring operating mechanism, stress relaxation, metal fatigue, and any other mechanical defects are easily occurring. And the mechanical performance of the circuit breaker will be influenced by the above defects. Therefore, identifying and predicting the mechanical conditions of the spring operation mechanism can improve the reliability of the circuit breaker. In the present paper, the 252 kV circuit breakers are used as test objects. Firstly, the spring stress relaxation test, the life-cycle test, and the failure simulated test of 252 kV circuit breakers are carried out. Secondly, a multi-body dynamics simulation model of the experimental prototype is established. Thirdly, support vector machine, random forest, and deep neural network are used in the condition identification of the circuit breaker to compare their performances. Then, the prediction model of spring in stress relaxation test is built, however, the model is not suitable for the life-cycle test of repeat close-open operation. Finally, the remaining useful life prediction model is proposed by using Wiener Process.

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“…SHM systems use a number of advanced sensors, such as fiber Bragg grating (FBG) sensors [ 21 , 22 , 23 , 24 ]. There are also works connected with the application of laser vibrometers in SHM application [ 8 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], but authors have not found any information about the use of such sensors onboard ships.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this article is to check whether SHM systems based on accelerometers—relatively simple and cheap sensors—can be useful. The authors are interested in the development of SHM systems in shipbuilding [ 28 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Szeleziński

Muc

Murawski

et al. 2021

Sensors

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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Coil spring failure and fatigue analysis

Cited by 78 publications

References 15 publications

Marine Propulsion System Failures—A Review

Marine Propulsion System Failures—A Review

Mechanical Condition Identification and Prediction of Spring Operating Mechanism of High Voltage Circuit Breaker

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

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