Overview
The UNILAstic software performs a vibration analysis based on samples of sound records to establish mechanical properties of materials (modulus of elasticity, Poisson's ratio and shear modulus) based on natural frequencies of the sample (flexional, torsional and longitudinal frequencies ). In addition, it is possible to construct a damping curve vs signal amplitude for each of the obtained natural frequencies. The complete system for performing the acoustic tests consists of a support unit for the specimens, a measurement unit and the UNILAstic software. The equipment was designed to perform non-destructive tests on small and medium cylindrical samples of different materials. The support consists of a light but strong aluminum structure for the location of the sample to be tested. The measuring unit consists of a microphone, a microfone stand and a hammer with a ball at the tip. To perform the test, the sample is located in the support unit where wires serve as support in a free-free support condition. The test basically consists of applying impacts with the ball hammer to the sample and the sound will be recorded by the microphone, finally the software is used to carry out the analyzes and extract the information. Here are shown (documentation) the details of the construction of the support unit so that it can be replicated in a simple way and with very low cost, by anyone, in addition, the software features are presented showing its simplicity in obtaining the material properties. UNILAstic Software is available free of charge (download).