Mantenimiento e implementación de un sistema de adquisición de datos a la máquina de ensayos mecánicos péndulo Charpy II del laboratorio de resistencia de materiales de la Facultad de Mecánica

Abstract

The veracity and accuracy of the results of a mechanical test guarantee the correct selection of a material based on its mechanical properties, therefore, the maintenance and implementation of a data acquisition system was carried out on the Pendulum Charpy II testing machine for research parpases for the School of Mechanical Engineering of the Escuela Superior Politécnica de Chimborazo. The investigative method was used to compile information pertinent to the development of the proposed objectives, in addition to an analytical method to select the most appropriate controller for the environmental and educational conditions that were considered, the selected being a microcomputer known as Raspberry pi 3 B+, which together with an incremental rotary encoder captured and processed the hammer position values after impact with the different specimens. This value together with the respective equations allowed to determine the energy absorbed by the different selected materials, these being the 1040, ASTM A36 and ASTM A304 steels, which are the most widely used in the national market. In addition, corrective and preventive maintenance was carried out on the different elements that make up the Charpy pendulum, where the elements deteriorated due to use were replaced, and those that were found in good condition were protected, a new maintenance plan was created, based on the new requirements of the equipment. It was finally possible to improve the precision and accuracy of the machine by implementing a digital data collection system, which provided greater precision with a percentage error of 0.44%, all this under the recommendations of the ASTM E23, INEN 130, INEN 1503 standards.