| Summary: | 碩士 === 國防大學理工學院 === 軍事工程碩士班 === 103 === This research was aimed at the indirect tension strength and failure patterns of artificial rock under impact loading and was tried to clarify how the particle and cement material influence the total strength of the artificial rock.
The grinding stones and gypsum were adopted and mixed with a constant weight ratio to mold the artificial rock; the size of the sample is 5 cm in diameter and 2.5 cm in thickness. In order to conduct a wide range of loading rates, the MTS 810 material testing machine and Split Hopkinson Pressure Bar (SHPB) were used to conduct the indirect tension strength test. Finally, the samples after test were collected to conduct sieve analysis to investigate the effects of the particle and cement on strength.
The experimental results showed that the indirect tensile strength of grinding stone, gypsum and artificial rock materials were increased with loading rate increasing, and the failure patterns were changed from block failure to crush failure. Under the lower loading rate (0.01-1 GPa/s) conducted by the MTS 810 Material Test System, it can be found that the indirect tensile strength of the artificial rock is controlled by the interface properties between particle and cement materials. However, under the middle to high loading rate (500-1400 GPa/s) conducted by SHPB, the degree of fracture of the sample is the most apparent with the particle content of 40, while the strength of the sample is the highest with the particle content of 60%.
|
|---|
