Análise da ruptura de um pivô de suspenção veicular

Abstract

The failure analysis of a vehicle suspension pivot was presented through a case study in which the part sample was evaluated. The suspension pivot is an element that receives large loads from braking, up and down movement of the wheel and change of direction. He is responsible for sustaining the wheel and connecting the bodywork to the other suspension elements. The part is a model belonging to a 2013 passenger vehicle, which after the failure was stored in a plastic bag from the new replaced part, after being stored indoors for about six months. The manufacturer of the part was also not identified. Ductile failures usually occur during manufacturing or service start-up. According to ASTM Handbook 11, the most common ductile fracture failures are related to errors in controlling service stresses, misuse or abuse in service, improper selection or processing of materials, or poor manufacturing. The present study was intended to show a correct analysis of mechanical failure. In the fractographic analysis stages, a preliminary examination was carried out, which includes; the photographic record of the piece received, and cleaning and macroscopic examination, this consists of observing the fractured surface in a stereomicroscope. Finally, a microscopic examination was carried out using scanning electron microscopy and metallography to observe the characteristics of the material.