Dynamic test study of coal rock under different strain rates
Abstract：The impacting compression test of coal rock was made by ~b75 mm Split Hopkinson Pressure Bar (SHPB) under different strain rates. The results show that the characters of coal rock are complicated and dispersed. Under low- er strain rate, the specimens presents an axial cleaving failure mode, while under higher strain rate, the specimens presents an crushing failure mode. Dissipation energy of specimens during process of the impacting increases with in- crease of strain rate, and relationship between them is a weak power function or linear distribution. The fractal dimen- sion of the fragmented coal rock ranged from 1.7 to 2.2, and there is a linear correlation between the fractal dimension and the strain rate. The larger the strain rate, the smaller the the greater the dissipation energy. fragmentation size, the larger the fractal dimension and
Keywords：coal rockstrain rateSplit Hopkinson Pressure Bar (SHPB)dynamic mechanical propertiesenergy dis-sipationfractal dimension of fragmentation distribution
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 1528-1534 )