Resumo: A resistência à tração diametral tem se mostrado um importante parâmetro para a caracterização mecânica dando origem a muitos métodos indiretos. O ensaio de Lobo Carneiro é conhecido internacionalmente sob o título de Brazilian test com a finalidade de estudar a tração em concreto, no entanto, sua aplicação se expandiu à determinação das constantes elásticas de materiais biológicos. A combinação de diferentes técnicas ópticas interferométricas são aplicáveis na determinação da área de contato bem como da deformação de um corpo de prova cilíndrico sob tensão mecânica. O objetivo geral do presente trabalho é de determinar as propriedades mecânicas de um corpo de prova submetido à compressão diametral por diferentes técnicas: técnica fotomecânica de Moiré, Técnica a Laser. Como modelo ideal foram utilizados 03 corpos de prova (CP) de borracha maciça (Bo) sendo submetidos a 5 diferentes razões de deformação específica (strain rate) gerando assim os gráficos que representam o comportamento do CP quando submetido a compressão diametral a diferentes valores de strain rate. As técnicas do Carimbo e da Medição direta estão alinhadas e dão suporte aos ensaios de Moiré e do Laser sendo que os resultados foram bem parecidos, pois foram feitos ao mesmo tempo durante a compressão do CP e comprovam que a área de contato pode-se notar a partir das mesmas. As Técnicas a Laser e a Fotomecânica/Moiré foram feitas separadamente, porém utilizando o software IMAGEJ e o software Moiré Fringes, nota-se que ambas proporcionaram a montagem das semi-elipses de onde partiram os cálculos para a área da Elipse total, Área total de contato Ver menos

Abstract: Tensile strength has been shown to be an important parameter for mechanical characterization, giving rise to many indirect methods. Lobo Carneiro test is internationally known under the title of Brazilian test with the purpose of studying the traction in concrete, however, it is application has expanded to the determination of the elastic constants of biological materials (Sherif, S.M.,1979). The combination of different optical interferometric techniques is applicable in determining the contact area as well as the deformation of a cylindrical specimen under mechanical stress. The general objective of the present work was to determine the mechanical properties of a specimen submitted to diametric compression by the different techniques: photomechanical moiré technique, stamp technique, direct measurement with a caliper and laser. As an ideal model, 03 solid rubber specimens were used, being subjected to 5 different specific strain ratios (strain rate), thus generating graphs that represent the behavior of the specimens when subjected to diametric compression at different strain rate values. The stamping technique is based on the impression of the contact area generated by the diametrical of the specimen positioned on a sheet of paper placed on the base of the press and the specimen is painted with matte black ink, as shown in Figure 17 in five different diametric compression ratios, namely 30mm/s, 60mm/s, 90mm/s, 120mm/s and 150mm/s, on a sheet of paper positioned between this and the base of the press, as shown in Figure 17, for the stamp technique, the specimen is painted with black printing ink, it is expected that this work will contribute to a deeper discussion on the appropriate parameter to be obtained from the diametrical compression test to study the mechanical behavior of the specimen with the support of Moiré techniques combined with the ImageJ software to verify the lateral deformation and on contact basis. The Stamping and Direct Measurement techniques are aligned and the results were very similar, as they were performed at the same time during de specimen compression and proved that the contact area can be noticed from them. The Laser Technique and Photomecanic were done separately, but using the IMAGEJ and the Moiré Fringes software, it is noted that both provided the assembly of the semi-ellipses from which the calculations for the area of the total ellipse and total area de contact Ver menos