Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests
Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests
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循环能量：深度传感压痕测试中矿物硬度的有用指标
DOI：
10.1016/j.jsg.2018.09.004
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发表时间：
2018
影响因子：
3.1
通讯作者：
Michibayashi Katsuyoshi
中科院分区：
文献类型：
--
作者：
Masuda Toshiaki;Omori Yasutomo;Sakurai Ryoko;Miyake Tomoya;Yamanouchi Mirai;Harigane Yumiko;Okamoto Atsushi;Michibayashi Katsuyoshi
深度感测压痕试验采用三角形金字塔形金刚石压痕器，在最大载荷范围为30至100 mN的情况下，对莫氏硬度等级的矿物（除金刚石外）以及其他矿物（斑石、复石和电气石）进行了循环能量（相当于产生压痕所消耗的能量）和压痕的剩余深度。提出了一种新的图形表示方法，可以表示矿物在log（穿透深度）- log（环能量）空间中的硬度。每种矿物在不同载荷下的数据得到一条斜率为2.6-2.9的直线回归线（滑石除外，斜率为2.2），而不同矿物在给定载荷下的数据得到一条斜率为1.1-1.2的直线回归线。根据log（穿透深度）- log（环路能量）空间对理想材料进行的理论分析表明，存在两组平行回归线，斜率分别为3（每种矿物在不同载荷下的数据）和1（给定载荷下不同矿物的数据）。结果表明，实测斜率与理论斜率之间有轻微偏差，这可能反映了压痕试验期间矿物力学性能的逐渐变化。
Depth-sensing indentation tests were performed to obtain the loop energy (equivalent to the energy consumed to produce the indentation) and the residual depth of the indentation using a triangular pyramidal diamond indenter for the minerals in Mohs hardness scale except for diamond, as well as other minerals (apophyllite, forsterite, and tourmaline), at a maximum load ranging from 30 to 100 mN. A new graphic presentation is proposed that shows the hardness of minerals in log(penetration depth)−log(loop energy) space. The data for each mineral under different loads give a straight regression line with a slope of 2.6–2.9 (except for talc, which yields a slope of 2.2), while the data for different minerals under a given load yield a straight regression line with a slope of 1.1–1.2. A theoretical analysis of ideal materials, in terms of log(penetration depth)−log(loop energy) space, shows the existence of two series of parallel regression lines with slopes of 3 (data for each mineral at different loads) and 1 (data for different minerals under a given load). The results show a slight deviation between the measured and theoretical slopes, probably reflecting a progressive change in the mechanical properties of the minerals during the indentation tests.