Fig. 1. Test specimens (pine tree, shale, and granite) used in this study
Fig. 2. Measurement of impact force signal response
Fig. 3. Measured impact signals of test specimens in time domain (X-axis: time, Y-axis: impact force)
Fig. 4. Schematic view of total impact force signal energy calculation
Fig. 5. Comparison of total impact force signal energy for different materials
Fig. 6. Uniaxial direct compressive test machine
Fig. 7. Comparison of total impact force signal energy and measured direct compressive strength
Table 1. Measured compressive strength
References
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