ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The investigation on the behavior of a specimen under uniaxial tension and the process ofmicrofracture attracts considerable interest with a view to understanding strength characterization ofbrittle materials. Little attention has been given to the detailed investigation of influence ofheterogeneity of rock on the progressive failure leading to collapse in uniaxial tension. In this paper, anumerical code RFPA3D (Realistic Failure Process Analysis), newly developed based on athree-dimensional model, to simulate the fracture process and associated fractal characteristic ofheterogeneous rock specimen subjected to direct uniaxial tension. Specimens with differentheterogeneity are prepared to study tension failure. In a relatively homogeneous specimen, themacrocrack nucleates abruptly at a point in the specimen soon after reaching peak stress. In moreheterogeneous specimens, microfractures are found to appear diffusely throughout the specimen, andthe specimens show more ductile failure behavior and a higher residual strength. Development offractal theory may provide more realistic representations of rock fracture. The fractal dimension ofdistributed AE is computed during the fracture process. For all specimens, the fractal dimensionincreases as the loading proceeds, and it reaches the peak value when macrocrack nucleates abruptly.It is also found that fractures scatter more diffusely in relatively heterogeneous specimens, and thefractal dimension has a smaller value. The homogenous rock specimens have flat and smooth rupturefaces which are consistent with the fractal results
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2321.pdf
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