Abstract
In the search for alternatives to obtain more information from rock tests and to make them more accessible, this study applies the Digital Image Correlation technique (DIC 2D) in a diametral compression test called Brazilian Test, comparing the result measured by an extensometer with the result obtained by DIC. Rock tests provide information about rock characteristics applicable to several engineering areas, such as mining and construction. In tests using strain gauges to measure strain, the equipment is expensive and there is a risk of breaking the instrument due to the contact with the specimen. However, tests measuring strain through the DIC technique may be more accessible, using open source software and lower cost equipment when compared to the cost of the extensometers. The results of this study demonstrate that the DIC technique enables: 1) complementing the information of diametrical tests obtained using strain gauges, for example, supporting the visualization of crack propagation; and 2) in some cases, replacing the use of extensometers, as far as a variation is tolerated.
Highlights
According to Azevedo and Marques (2002), rocks are consolidated solid materials, formed naturally by aggregates of mineral matter
The linear displacement can be measured by a position transducer, known as LVDT (Linear Variable Differential Transformer)
Strain gauges are attached to the specimen and they are discarded after the test
Summary
According to Azevedo and Marques (2002), rocks are consolidated solid materials, formed naturally by aggregates of mineral matter. Their internal cohesion – the force that binds the particles to each other – and the tensile strength are the main properties that distinguish them from soils. Due to the large variation in rock properties, some basic measurements are taken as a reference to describe the rocks quantitatively These properties are known as index properties, obtained through rock samples and they are relatively easy to measure. In rock compression tests to measure radial and axial strain, load cells, strain gauges and position transducers are used. Strain gauges are attached to the specimen and they are discarded after the test
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