Influence of Temperature and Crystal Orientation on Compressive Strength of Rock Salt Using a Newly Developed High-Pressure Thermal Cell
Influence of Temperature and Crystal Orientation on Compressive Strength of Rock Salt Using a Newly Developed High-Pressure Thermal Cell
复制标题
使用新开发的高压热室研究温度和晶体取向对岩盐抗压强度的影响
DOI：
10.1007/s00603-021-02655-0
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发表时间：
2021
影响因子：
6.2
通讯作者：
Truster, Timothy J.
中科院分区：
文献类型：
--
作者：
Moslehy, Amirsalar;Alshibli, Khalid A.;Truster, Timothy J.
岩盐在自然界中以单晶或多晶形式存在，其中晶体结构、晶粒和晶界性质对其强度有主要影响。相对于岩盐的晶体取向，单晶岩盐的抗压强度高度依赖于加载方向。大多数盐层要么位于高温环境中，要么暴露在高温下。因此，在评价岩盐的本构行为时，应考虑温度的影响。本文介绍了一种新型高压热电池的设计细节，该热电池可以承受高达15 MPa的围压和150°C的最高温度。合成了3种不同晶粒和晶界性能的多晶岩盐试样，研究了晶粒和晶界性能对多晶岩盐强度性能的影响。利用实验结果研究了晶粒尺寸、晶界特性、退火工艺和温度对多晶岩盐无侧限抗压强度的影响。此外，制备了18个天然单晶岩盐试样，并在不同温度下以三种不同的晶体取向相对于加载方向进行了测试。平行于[10 0]和（10 0 0）的19°至（10 0 0）的试样显示出非常相似的行为。然而，在30°至（10°0）上测试的试件在20°C时表现出更高的无侧限抗压强度，而当温度升高时，其无侧限抗压强度显著降低。
Rock salt is found in nature either in a single crystal or polycrystalline form, where crystal structure, grain, and grain boundary properties have major effects on its strength. The compressive strength of single-crystal rock salt is highly dependent on the loading direction with respect to rock salt’s crystal orientation. Most salt formations are either located in a hot environment or exposed to elevated temperatures. Therefore, the influence of temperature should be considered when evaluating the constitutive behavior of rock salt. In this paper, the details of the design of a new high-pressure thermal cell that can withstand a confining pressure up to 15 MPa and a maximum temperature of 150 °C are presented. Three types of polycrystalline rock salt specimens with different grain and grain boundary properties were synthesized to study the effects of grain and grain boundary properties on the strength properties of polycrystalline rock salt. The results of the experiments were then used to examine the influences of grain size, grain boundary properties, annealing process, and temperature on the unconfined compressive strength of polycrystalline rock salt. In addition, 18 natural single-crystal rock salt specimens were prepared and tested at three different crystal orientations relative to loading direction at different temperatures. Specimens tested parallel to [1 0 0] and 19° to (1 0 0) in (0 1 0) showed quite a similar behavior. However, specimens tested on 30° to (1 0 0) in (0 1 0) exhibited a much higher unconfined compressive strength at 20 °C, while their unconfined compressive strength was significantly reduced when the temperature was increased.
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DOI：
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发表时间：
1953
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DOI：
--
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1963
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DOI：
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发表时间：
2017
期刊：
影响因子：
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作者：
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