Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests

Masuda, Toshiaki; Omori, Yasutomo; Sakurai, Ryoko; Miyake, Tomoya; Yamanouchi, Mirai; Harigane, Yumiko; Okamoto, Atsushi; Michibayashi, Katsuyoshi

doi:10.1016/j.jsg.2018.09.004

Cited by 4 publications

(6 citation statements)

References 36 publications

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“…The similarity of values between the two investigations observed in Figure 3 could be discussed in their crystallographic orientations. However, Masuda et al [21] were unable to describe the crystallographic orientation of 7 tested minerals. Based on this fact, the similarity of values can be considered surprisingly high, except for pairs 2 and 4.…”

Section: Scratchability Of Materials: Looking For An Indicator Of Hardness Differentialmentioning

confidence: 99%

“…Masuda et al [21] determined the Meyer hardness for nine minerals of the Mohs scale. The hardness ratio for each pair of minerals up to corundum (mineral number 9) can be calculated, besides data presented elsewhere [14], which was s determined by Broz et al [22].…”

Section: Scratchability Of Materials: Looking For An Indicator Of Hardness Differentialmentioning

confidence: 99%

“…Second, when the fracture acts in favor of the scratching process, some minerals can behave like metals, as described by Tabor [15]. Hardness ratios for Mohs mineral pairs as measured by Masuda et al [21] and Broz et al [22]. Both references used depth-sensing techniques.…”

Section: Summary Of Wear Mechanisms and Surface Damages On Surfaces Associated With Each Wear Regime Of Abrasion Separated By The Hardnesmentioning

confidence: 99%

“…Figure 3.Hardness ratios for Mohs mineral pairs as measured by Masuda et al[21] and Broz et al[22]. Both references used depth-sensing techniques.…”

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confidence: 99%

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Remarks on Wear Transitions Related to Hardness and Size of Abrasive Particles

Pintaúde¹

2022

Tribology of Machine Elements - Fundamentals and Applications

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Abrasive wear is highly dependent on the characteristics and properties of abrasive particles. Their hardness and size can define the severity of abrasion in terms of wear rates. Typically, critical values have been empirically determined to define the transition between mild and severe wear. This review aims to update some of the issues related to these critical values and their relations to abrasive wear. After presenting the current state-of-art, the following items are discussed: a) the scratchability of materials; b) the particle fragmentation associated with size effects; and c) description of abrasion severity.

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Section: Scratchability Of Materials: Looking For An Indicator Of Hardness Differentialmentioning

confidence: 99%

Section: Scratchability Of Materials: Looking For An Indicator Of Hardness Differentialmentioning

confidence: 99%

Section: Summary Of Wear Mechanisms and Surface Damages On Surfaces Associated With Each Wear Regime Of Abrasion Separated By The Hardnesmentioning

confidence: 99%

“…Figure 3.Hardness ratios for Mohs mineral pairs as measured by Masuda et al[21] and Broz et al[22]. Both references used depth-sensing techniques.…”

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confidence: 99%

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Remarks on Wear Transitions Related to Hardness and Size of Abrasive Particles

Pintaúde¹

2022

Tribology of Machine Elements - Fundamentals and Applications

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“…We, instead, used the model of Yu and Blanchard (1996), which applies to an elastic‐perfectly plastic solid indented by a rigid conical indenter. Here, σ y is expressed through an inverse hyperbolic function:

{\sigma }_{y}=\frac{E\,\tan \,\theta }{2\left(1-{\nu }^{2}\right){C}_{\theta }}{\tan \,h}^{-1}\left[\frac{2\left(1-{\nu }^{2}\right)H}{E\,\tan \,\theta }\right]

where, C θ is an empirically derived function of θ , the angle between the face of the indenter and the surface of the specimen, and ν is Poisson's ratio, which we consider an average of 0.27 along [010] for gypsum (Fu, 2017; Masuda et al., 2018). For Vickers indenter, θ = 22° (Evans & Goetze, 1979), resulting C θ = 2.6817.…”

Section: Methodsmentioning

confidence: 99%

Insights Into the Micromechanics of Dehydration‐Induced Gypsum to γ‐Anhydrite Phase Transition From Instrumented Microindentation Experiments

Mukherjee,

Misra

2024

JGR Solid Earth

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Gypsum, an anisotropic hydrous mineral, localizes strain through dehydration‐induced embrittlement and hydrodynamic lubrication, affecting the deformation in active tectonic settings. Here, we examine the micromechanical status of syn‐ and post‐dehydration gypsum‐phases, crucial for understanding intra‐crystalline deformation. We micro‐indented the (010) planes of natural gypsum crystals from 30 to 140°C at various strain‐rates to track mechanical changes during progressive dehydration and phase transition. Thermogravimetric analyses reveal that gypsum dehydrates between 100 and 140°C following a sigmoidal curve. Micromechanical data show, at 30°C, the mean hardness of gypsum is 2.42 GPa, reducing to 0.5 GPa at 140°C, after complete dehydration. Following the sigmoidal dehydration trend, elastic modulus, fracture toughness, and yield stress likewise drops with progressive dehydration. The Gypsum‐Hemihydrate phase exhibits strain‐rate sensitive elastoplastic deformation between 30 and 110°C, as hardness decreases with increasing strain‐rate. We propose that delamination of the layers and extensive tensile cracking along [010] cause this strain‐rate sensitive behavior, displaying Indentation Size Effect. Dehydrated phases (Hemihydrate and γ‐Anhydrite) are formed as exfoliated pseudomorphic flakes through topotactic transformation along [010] and show two sets of oppositely dipping slip systems. During the late dehydration stage (120–140°C), plastic strain is accommodated by the sliding of these flakes along with inelastic pore compaction, resulting in strain‐rate insensitive plastic deformation of the system.

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Mechanochemical remediation of the chlorinated compounds contaminated soil depending on the minerals inside-the most reasonable approach

Yao

Wang

et al. 2023

Chemosphere

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Loop energy: A useful indicator of the hardness of minerals from depth-sensing indentation tests

Cited by 4 publications

References 36 publications

Remarks on Wear Transitions Related to Hardness and Size of Abrasive Particles

Remarks on Wear Transitions Related to Hardness and Size of Abrasive Particles

Insights Into the Micromechanics of Dehydration‐Induced Gypsum to γ‐Anhydrite Phase Transition From Instrumented Microindentation Experiments

Mechanochemical remediation of the chlorinated compounds contaminated soil depending on the minerals inside-the most reasonable approach

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