TY  - JOUR
A1  - Mardoukhi, Ahmad
A1  - Mardoukhi, Yousof
A1  - Hokka, Mikko
A1  - Kuokkala, Veli-Tapani
T1  - Effects of test temperature and low temperature thermal cycling on the dynamic tensile strength of granitic rocks
JF  - Rock mechanics and rock engineering
N2  - This paper presents an experimental procedure for the characterization of the granitic rocks on a Mars-like environment. To gain a better understanding of the drilling conditions on Mars, the dynamic tensile behavior of the two granitic rocks was studied using the Brazilian disc test and a Split Hopkinson Pressure Bar. The room temperature tests were performed on the specimens, which had gone through thermal cycling between room temperature and - 70 degrees C for 0, 10, 15, and 20 cycles. In addition, the high strain rate Brazilian disc tests were carried out on the samples without the thermal cyclic loading at test temperatures of - 30 degrees C, - 50 degrees C, and - 70 degrees C. Microscopy results show that the rocks with different microstructures respond differently to cyclic thermal loading. However, decreasing the test temperature leads to an increasing in the tensile strength of both studied rocks, and the softening of the rocks is observed for both rocks as the temperature reaches - 70 degrees C. This paper presents a quantitative assessment of the effects of the thermal cyclic loading and temperature on the mechanical behavior of studied rocks in the Mars-like environment. The results of this work will bring new insight into the mechanical response of rock material in extreme environments.
KW  - granite
KW  - dynamic loading
KW  - high strain rate
KW  - fractal dimension
KW  - low
KW  - temperature
KW  - split Hopkinson pressure bar
Y1  - 2020
U6  - https://doi.org/10.1007/s00603-020-02253-6
SN  - 0723-2632
SN  - 1434-453X
VL  - 54
IS  - 1
SP  - 443
EP  - 454
PB  - Springer
CY  - Wien
ER  -