Diseño e implementación de un sistema portátil para mediciones de deformación en ensayos de resistencia de materiales para la carrera de Ingeniería Civil de la Universidad Nacional de Chimborazo.

Abstract

The present work designed and implemented a portable system for deformation measurements in materials resistance tests in the civil engineering career of the National University of Chimborazo. It proceeded to the characterization of the sensor by determining that two of its pins served for the powering and two pins for the signal that generates. The design started in function of these parameters. The power supply of the portable system was by means of a symmetrical source, the source powered so much the sensor and amplifier AD620. It performed the conditioning of the emitted signal by the sensor through the regulation of the voltage to the amplifier with integrated, 7812 and 7912. In addition to the filtering of the signal for diminishing the noise through a 330 uF capacitor. Once the signal repaired, the communication performed to the Arduino for transmission to Lab view platform. The Human-Machine Interface (HMI) designed to obtain the variable of longitudinal deformation and mathematical model of the portable system. As a result, it obtained that the function that rules the behavior of the sensor corresponds to y=14,9182 x - 4,6783 based on the study executed by Jácome M. (2017); it obtained through tests with six pattern blocks with the portable system implemented data of longitudinal deformation with percentage relative errors less than 1% with distributions of normal type when compared with a reference equipment called analogous compressometer determined that this yields accurate data through a Student’s T-test with a confidence level of 95%. The present work recommends performing research within this area other types of sensors than can be implemented to quantify other mechanical properties of engineering materials such as traction, tension or strength, thermal resistivity among others.