Diseño y construcción de una máquina de ensayos a fatiga axial para polímeros

Abstract

The present work deals with the design and construction of a machine prototype to test axial fatigue in polymers. The alternative analysis method was used, thus obtaining the best solution that guarantees accurate axial fatigue tests in terms of load applied to the specimen and number of life cycles in question. It works by means of a system activated by a pneumatic cylinder, which generates the movement of two axes in parallel, with the help of a fixed and a mobile clamp that hold the polymer specimen, exposing it to traction each time the operating cycle is repeated. when one of the Sharp distance sensors located in the lower part is activated, the cycle count begins at the same frequency and with a constant load, while the load is repeatedly applied to the analyzed polymer, temperature data are taken with the help of a LM35 sensor, when the failure of the polymeric material occurs, the second Sharp sensor is activated, which gives the order to stop the operation of the system. The acquisition of test data is done through an Arduino nano connected to the computer in a programmed software interface, which has user-friendly graphic details, communication between sensors, data collection and results reporting was achieved. with the help of program libraries. Specialized software was used in this field. Following the recommendations of the ASTM 3479 Standard, six tests were carried out on the same specimens, exposed to the same frequency and different loads, analyzing the results, fatigue fractures were presented, it was concluded that the prototype works, an improvement with the help of sensors is recommended. industries that provide better data.