Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests
| Autor: | Yumiko Harigane, Tomoya Miyake, Toshiaki Masuda, Mirai Yamanouchi, Katsuyoshi Michibayashi, Yasutomo Omori, Atsushi Okamoto, Ryoko Sakurai |
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| Rok vydání: | 2018 |
| Předmět: |
Yield (engineering)
Mineralogy 02 engineering and technology engineering.material 010502 geochemistry & geophysics Talc 01 natural sciences Penetration depth Indentation medicine Mohs scale of mineral hardness Depth-sensing indentation test 0105 earth and related environmental sciences Mineral New graphic presentation Diamond Geology 021001 nanoscience & nanotechnology Apophyllite Mohs hardness scale engineering Loop energy 0210 nano-technology medicine.drug |
| Zdroj: | Journal of Structural Geology. 117:96-104 |
| ISSN: | 0191-8141 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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