Microstructure Effect on Hard Rock Damage and Fracture During Indentation Process

Autor: Salma Souissi, H. Sellami, Essaieb Hamdi
Přispěvatelé: Ecole Nationale d'Ingénieurs de Tunis (ENIT), Université de Tunis El Manar (UTM), Centre de Géosciences (GEOSCIENCES), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
Rok vydání: 2015
Předmět:
Materials science
0211 other engineering and technologies
Soil Science
Geology
02 engineering and technology
Radius
[PHYS.MECA.MSMECA]Physics [physics]/Mechanics [physics]/Materials and structures in mechanics [physics.class-ph]
010502 geochemistry & geophysics
Geotechnical Engineering and Engineering Geology
Microstructure
01 natural sciences
Displacement (vector)
[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering
Brittleness
[SDU]Sciences of the Universe [physics]
Rock indentation Indentation energy Crack pattern Image analysis technique Cracked zone Brittleness Rock texture Mineralogical components Specific energy
Indentation
Architecture
Fracture (geology)
Specific energy
Geotechnical engineering
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Rock microstructure
Zdroj: Geotechnical and Geological Engineering
Geotechnical and Geological Engineering, Springer Verlag, 2015, pp.1-12. ⟨10.1007/s10706-015-9920-6⟩
ISSN: 1573-1529
0960-3182
Popis: International audience; This paper presents the results of simple and double indentation tests conducted on three hard rocks: granite, limestone and sandstone. The main objective is to analyze the rock behavior under indentation test in relation with the physical and microstructural properties. First, the experimental set-up used during the tests is described as well as the sample preparation. Then, an image analysis based technique is applied on thick sections made from the tested samples in order to evaluate the size of indentation-induced cracked zone and to assess the crack types (vertical or sub-horizontal) below the indenter. The interpretation of the results was made on two levels. First, several physical parameters (energies and displacements) have been derived from the so obtained experimental indentation curves. Very high correlations were found between the loading, indentation and specific energies versus the plastic displacement. Second, cracked zone radius was estimated showing a very high correlation to the specific energy and governed by the physical and mineralogical properties of the tested rocks. Finally, the analysis of double indentation tests proved that changing the distance between two adjacent inserts allows the determination of the optimal spacing producing overlay of cracked zones and causing rock damage and large chip departure.
Databáze: OpenAIRE
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