Failure analysis of a diesel generator connecting rod

C. Juarez, F. Rumiche, A. Rozas, J. Cuisano, P. Lean

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

22 Citas (Scopus)


This paper presents the results of a failure analysis investigation conducted in a connecting rod from a diesel engine used in the generation of electrical energy. The investigation included an extensive analysis of the con-rod material as well as the fracture zone. The investigation involved the following experimental procedures and testing techniques: visual inspection, fractography, magnetic particle inspection, chemical analysis, tensile and hardness testing, metallography, and microanalysis. The connecting rod was fabricated from an AISI/SAE 4140 low alloy steel; chemical composition, mechanical properties and microstructure were appropriate for the application. The connecting rod fractured at the body in a section close to the head; the origin of the fracture was located at the con-rod lubrication channel. The lubrication channel exhibited an area containing a tungsten based material, presumably from a machining tool, embedded in its surface as a result of a deficient manufacturing process. This area acted as nucleation site for cracks that propagate through the connecting rod section by a fatigue mechanism, reducing its section and finally producing its catastrophic failure.

Idioma originalInglés
Páginas (desde-hasta)24-31
Número de páginas8
PublicaciónCase Studies in Engineering Failure Analysis
EstadoPublicada - 1 oct. 2016


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