Diseño y construcción de un banco para prácticas de extensometría

Abstract

The objective of this study was the development of the test bench for extensometry practices whose purpose was to determine the tensile state of mechanical elements, several criteria provided by the ASTM E83-10a Standard were used, as well as recommendations by the manufacturers of strain gauges and data acquisition module. Thus, using flowcharts, each element that intervenes in the process was selected in an appropriate way. To determine the tensor state, a static load was applied to the mechanical element in which there is a strain gauge capable of measuring its deformation. This information is sent through a Wheatstone bridge to the data acquisition card. which is the intermediary between the test bench and the PC. In LabVIEW, an interface was developed which allows displaying the data obtained by the gauges and determining through equations the values of their efforts, Young's modulus and Poisson's ratio, obtaining results close to the data provided by steel manufacturers and calculated manually. The percentage of error thrown by the test bench is less than 1%, the test bench has a portable measurement system, which allows the operator to move the unit and obtain the tensile state of any mechanical element. It is concluded that the information provided by the test bench is true and reliable while allowing engineering students to compare the data provided by it with those obtained in the classroom.