Failure analysis of metal alloy propeller shafts

Sitthipong, Siva; Towatana, Prawit; Sitticharoenchai, Amnuay

doi:10.1016/j.matpr.2017.06.158

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…As seen in a previous case study, fillets, tapers and chamfers also represent stress concentration points in shafts and their improper design can lead to fatigue failure. An additional case study of fracture initiated at a fillet [49] shows fatigue failure due to a cyclic torsional-bending load acting on a crack emanating from the fillet shoulders on the shaft. Gradual shaft load bearing reduction led to consequential overloading and final sudden failure.…”

Section: Ship Propulsion System 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: Ship Propulsion System Failuresmentioning

confidence: 99%

Marine Propulsion System Failures—A Review

Vizentin

Vukelić

Murawski

et al. 2020

JMSE

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“…Inadequate design of these elements can lead to fatigue failure. Case Figure 3 The Characteristic Torsional Failure Crack Shape [8] studies of fractures initiated at this elements [10], [11] show fatigue due to cyclic torsional-bending load, with a crack that originates in multiple points on fillet shoulders on the shaft, gradually reducing the load bearing area of the shaft as it grows, and finally resulting in a sudden failure during overload as shown in Figure 4. The analysis for this case study has been comprised of chemical composition analysis, micro-structural characterization, fractography, hardness measurements, and finite element simulation.…”

Section: Filletsmentioning

confidence: 99%

“…The resulting effect is a dynamic load on collar coupling bolts in a longer operating time [13] which can result in fatigue failure. The fretting that occurs on adjacent connecting surfaces in these cases creates micro notches that develop into fatigue cracks with the direction The Characteristic Torsion Failure Crack Propagation Shape (45° angle) [10] of failure growth in planes angled from 35° to 60° which is not characteristic of pure torsion fatigue failures. The analysis has shown that the coupling bolts are subjected to an increasing bending moment which contributes to fatigue crack growth.…”

Section: Bolted Connectionsmentioning

confidence: 99%

Common failures of ship propulsion shafts

2017

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This article aims to provide a critical review of the most common failures of ship propulsion systems as a crucial ship system, with emphasis on fatigue failure. The accent is given on the shaft of marine propulsion systems as a most common point of failures in the entire propulsion system. A general description of failure causes and failure analysis methodology is presented. Several representative case studies summaries for fatigue failure on critical points of the propulsion shaft are described. Torsional vibrations and geometric stress concentrations of the shaft are identified as the most common cause of fatigue failure. The importance of constant monitoring, measurement and data collection of fatigue indicators and indicative events that have influence on fatigue development is emphasized. Methods used in failure analysis are discussed and propositions for improvement are given, especially in terms of using numerical routines in failure prediction.

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“…The results showed that the failure of this shaft was due to torsional fatigue caused by cracks at the root of the threads. Sitthipong et al [14] performed a failure analysis of a marine metal alloy propeller shaft. The results showed that the geometry of the rounded corners promoted cracks due to poor design of the rounded corners.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

Huang,

Wang,

et al. 2024

Metals

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This paper investigates the failure mechanism of the rear drive shaft in a modified pickup truck which had operated for about 3000 km. The investigation included macroscopic and microscopic evaluation to document the morphologies of the fracture surface, measurement of the material composition, metallographic preparation and examination, mechanical testing, and finite element modelling and calculations. The results obtained suggest that rotation-bending fatigue was the primary cause of the drive shaft failure. The crack initiation is located in the root of the machined threads on the drive shaft surface and expanded along the side of the machining line surface. The main cause of fatigue cracks is attributable to a high stress concentration owing to a large unilateral bending impact under overload. Meanwhile, the bidirectional torsional force also produces a higher stress concentration and thus accelerates the fatigue crack to expand radially along the surface. Furthermore, the hardness of the central section of the drive shaft was marginally below standard. This deficiency results in harm to the bearings and other mechanical components, as well as expediting the enlargement of cracks. Finite element analysis revealed significant contact stress between the bearing and drive shaft, with stress levels exceeding the fatigue limit stress of the parent material. This highlights the need for reevaluation of the heat treatment process and vehicle loading quality to enhance the drive shaft’s longevity.

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Failure analysis of metal alloy propeller shafts

Cited by 7 publications

References 1 publication

Marine Propulsion System Failures—A Review

Marine Propulsion System Failures—A Review

Common failures of ship propulsion shafts

Failure Mechanism of Rear Drive Shaft in a Modified Pickup Truck

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