Failure analysis of four-cylinder diesel engine crankshaft

In this article, failure analysis was examined in four-cylinder light-duty truck diesel engine crankshaft. The failure happened in service after 95,000 km of operation by fatigue crack growth which was initiated from a surface defect on the second crankpin from the crankpin–web fillet. For such obje...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2019, Vol.41 (1), p.1-8, Article 30
Main Author: Aliakbari, K.
Format: Article
Language:English
Subjects:
Chemical composition
Crack propagation
Crankshafts
Diesel engines
Engine cylinders
Engineering
Failure analysis
Fatigue failure
Fracture mechanics
Fracture surfaces
Mechanical Engineering
Mechanical properties
Microcracks
Microscopy
Morphology
Optical microscopy
Organic chemistry
Review
Scanning electron microscopy
Scientific imaging
Spectrometry
Spectroscopy
Stress concentration
Surface defects
Tensile tests
Webs
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Summary:In this article, failure analysis was examined in four-cylinder light-duty truck diesel engine crankshaft. The failure happened in service after 95,000 km of operation by fatigue crack growth which was initiated from a surface defect on the second crankpin from the crankpin–web fillet. For such objective, standard specimens were cut off from the crankshaft and examined to evaluate the mechanical properties. Some hardness and tensile tests were conducted, and spectrometry analysis was used in order to study the chemical composition of the crankshaft material. Also, for considering and evaluating the microstructure, microcracks, fracture surface and the cause of failure, optical microscopy and scanning electron microscopy equipped with energy-dispersive spectrometry were used. The morphology of the fracture surface shows that the failure happened in the second crankpin at the crankpin–web fillet of crankshaft where the stress concentration was the highest.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-018-1536-3