CONSTANT ELASTIC OF MATERIALS BY ULTRASOUND

Abstract

For proper application of material, it is necessary knowledge the material properties and for this is essential determine its elastic constants (longitudinal modulus of elasticity in different directions, tangential modulus of elasticity in different planes and Poisson's ratio). However, the properties determined by conventional test methods are extremely complicated, expensive and laborious, which makes the complete data are not available. The proposed research project is inserted in the research group of Nondestructive Testing Laboratory of the College of Agricultural Engineering at the University of Campinas (UNICAMP), which already has experience in ultrasound characterization of concrete and wood, but even for these materials, there are important gaps to be filled through scientific and technological research. Thus, the objective of this research is to analyze these gaps from the point of view of the theoretical aspects involved and propose solutions for increasing the accuracy of the results of characterization of materials by means of wave propagation method. As specific objectives, we propose to analyze the effect of reducing the polyhedral specimen in increasing the accuracy of determining the wood Poisson's ratio; analyze the accuracy of ultrasound characterization of concrete's traits specific produced with using different types of coarse aggregate and analyze the effect on the accuracy of ultrasound characterization of rocks and concrete considering different conditions of anisotropy. Thus, the research project will be developed in line of characterization of materials, aiming to consolidate a research cycle that has been developed in the research group, whose results were being separately built and thus contribute to the scientific growth in this area. (AU)