Failure Analysis of a Diesel Engine Connecting Rod

Compression ratio has very important influence on fuel economy, emission, and other performances of internal combustion engines. Application of variable compression ratio in diesel engines has a number of benefits, such as limiting maximal in cylinder pressure and extended field of the optimal operating regime to the prime requirements: consumption, power, emission, noise, and multifuel capability. The manuscript presents also the patented mechanism for automatic change engine compression ratio with two-piece connecting rod. Beside experimental research, modeling of combustion process of diesel engine with direct injection has been performed. The basic problem, selection of the parameters in double Vibe function used for modeling the diesel engine combustion process, also performed for different compression ratio values. The optimal compression ratio value was defined regarding minimal fuel consumption and exhaust emission. For this purpose the test bench in the Laboratory for Engines of the Faculty of Engineering, University of Kragujevac, is brought into operation.

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Failure analysis of ductile iron crankshaft in compact pickup truck diesel engine

Structures ◽

10.1016/j.istruc.2021.12.034 ◽

2022 ◽

Vol 36 ◽

pp. 482-492

Author(s):

Karim Aliakbari ◽

Reza Masoudi Nejad ◽

Tohid Akbarpour Mamaghani ◽

Pooya Pouryamout ◽

Hossein Rahimi Asiabaraki

Keyword(s):

Diesel Engine ◽

Failure Analysis ◽

Ductile Iron ◽

Pickup Truck

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Investigations on performance of diesel engine by varying injection timings with design modification on piston crown

World Journal of Engineering ◽

10.1108/wje-11-2017-0348 ◽

2018 ◽

Vol 15 (5) ◽

pp. 562-566

Author(s):

Vijaya K. ◽

Shailesh Palaparty ◽

Raghavan Srinivasa ◽

Ravi Kumar Puli

Keyword(s):

Diesel Engine ◽

Injection Pressure ◽

Combustible Mixture ◽

Injection Timing ◽

Connecting Rod ◽

Design Modification ◽

Content Type ◽

Piston Head ◽

Piston Crown ◽

Fuel Vaporization

Purpose Investigations are carried out with the aim of improving performance of a diesel engine with the design modification on piston crown to stimulate the uniform combustion by inducing turbulence in the incoming charge. Design/methodology/approach A stirrer is introduced at the top of the piston so as to inculcate more turbulence to the incoming charge by improving the rate of fuel vaporization. Whirling motion is created in the combustible mixture by providing rotating blades on the cavity/bowl of the reciprocating piston head. By putting a simple link mechanism, the oscillatory motion of connecting rod will rotate the blade by an angle of 60°. Findings The investigations are carried out with and without swirl piston at 17.5 compression ratio and 200 bar injection pressure by varying injection timings. Originality/value Finally, the result shows that by using the modified piston, nearly 3 per cent of efficiency increased and 31 per cent of NOx emissions are reduced compared to that of a normal piston with 80 per cent load at standard injection timing.

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Design, Buckling and Fatigue Failure Analysis of Connecting Rod: A Review

International Journal of Advanced Engineering Research and Science ◽

10.22161/ijaers.4.7.7 ◽

2017 ◽

Vol 4 (7) ◽

pp. 39-44

Author(s):

Manish Kumar ◽

Shiv N Prajapati

Keyword(s):

Failure Analysis ◽

Fatigue Failure ◽

Connecting Rod

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Fractographic Study of Marine Diesel Engine Connecting Rod Stud Bolt Crack

Latvian Journal of Physics and Technical Sciences ◽

10.2478/lpts-2021-0031 ◽

2021 ◽

Vol 58 (4) ◽

pp. 28-42

Author(s):

K. Carjova ◽

V. Priednieks ◽

R. Klaucans ◽

I. Irbe ◽

A. Urbahs

Keyword(s):

Fatigue Crack ◽

Diesel Engine ◽

Tensile Tests ◽

Marine Diesel Engine ◽

Connecting Rod ◽

Worst Case ◽

The People ◽

Marine Diesel ◽

Fatigue Rupture ◽

Fatigue Crack Development

Abstract Failures of marine diesel engine components can lead to serious consequences for a vessel, cargo and the people on board a ship. These consequences can be financial losses, delay in delivery time or a threat to safety of the people on board. This is why it is necessary to learn about connecting rod bolt failures in order to prevent worst-case scenarios. This paper aims at determining the origin, velocity and the duration of fatigue crack development of a diesel alternator engine which suffered a significant failure of one of its mains, not long after a major overhaul had been completed and with less than 1000 running hours having elapsed. It was verified with fatigue rupture of one of the four connecting rod stud bolts. Tensile tests were performed in the remaining connecting rod bolts. During this procedure, another fatigue crack in an adjacent bolt was identified. The probable root case of damage, and at the end some final remarks are presented.

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