دانلود رایگان مقاله تحلیل شکست میله دیزل ژنراتور اتصال

Abstract

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.

4. Conclusions

The connecting rod was fabricated from a AISI/SAE 4140 low alloy steel. Chemical composition, mechanical properties and microstructure are adequate for the application. Failure occurred at the body of the con-rod, close to the head, and involved the propagation by a fatigue mechanism of cracks nucleated at the lubrication channel. A layer of a tungsten based material embedded in a portion of the lubrication channel served as the area for crack nucleation. The W layer was possibly generated during the connecting rod fabrication process, particularly, during the lubrication channel machining.