Análisis Forense de un Cigüeñal Mediante Técnica de Fractografía y Simulación Mediante Elementos Finitos (MEF)

Abstract

This project performs a forensic analysis by the comparison of two crankshafts of double lubrication extracted from the engine of a 1996 Volkswagen vehicle of 1600 CC, the crankshafts presents a transversal fracture located between the third crankpin and the central stump. For this forensic analysis, macro and micrographs, hardness tests, chemical composition analysis and finite element analysis must be performed, the simulation will be validated by calculations of the stress that are generated. With the results of the tests and analysis performed, the manner in which the referred fracture occurred and the possible scenario that caused it was determined. The results show that the fractures were produced by a punctual and instantaneous stress that acts on the crankpin of the third cylinder, aggravated by the deficiencies that present the microstructure and the chemical composition, resulting in fractures of fragile nature observed in the macrographs.