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 °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 °C, − 50 °C, and − 70 °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 °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.

中文翻译：

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试验温度和低温热循环对花岗岩动抗拉强度的影响

本文介绍了一种在类火星环境中表征花岗岩的实验程序。为了更好地了解火星上的钻井条件，使用巴西圆盘试验和分裂霍普金森压力棒研究了两种花岗岩的动态拉伸行为。对样品进行室温测试，样品在室温和 - 70 °C 之间经历了 0、10、15 和 20 个循环的热循环。此外，在-30°C、-50°C和-70°C的测试温度下，对没有热循环加载的样品进行了高应变率巴西圆盘测试。显微结果表明，具有不同微观结构的岩石对循环热载荷的响应不同。然而，降低测试温度导致两种被研究岩石的抗拉强度增加，并且当温度达到 - 70 °C 时，两种岩石都观察到岩石软化。本文定量评估了热循环载荷和温度对类火星环境中所研究岩石力学行为的影响。这项工作的结果将为极端环境下岩石材料的力学响应带来新的见解。