Abstract
In the previous studies, authors carried out the computer simulation by FEM program and discussed the failure process and the size effect of rock specimen model subjected to compressive stress.In this study, behaviour of rock specimen under uniaxial tensile stress is examined by a similar computer simulation and some experimental work. For the computer simulation, FEM program implemented with a non-linear visco-elastic constitutive equation is used. In the experimental work, two kinds of rocks are tested under uniaxial tension to obtain the complete stress-strain curves. Surface of a rock specimen is carefully examined with the aid of CCD camera.The calculated results indicate that failure process of rock specimen is considerably complex, that is, cracks initiate and propagate at many separated locations in the specimen and a macro crack which leads to final failure is not a straight line but having many sharp turns. This calculated result conforms to the experimental result.The computer simulation also indicates that strength of specimen decreases with increase of the number of elements in FEM mesh. However, number of elements exceed 90, then strength dose not change apparently. It is also found that the loading rate dependency of strength decreases with number of elements. These results quantitatively coincide with the results obtained in the previous study for compression stress.
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