Influence of Sample Tilt and Applied Load on Microscratch Behavior of Copper Under a Spherical Diamond Indenter

Liu, Ming

doi:10.1007/s11249-021-01466-2

Cited by 17 publications

(3 citation statements)

References 128 publications

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“…Second, based on a single-point measurement, the friction coefficient was defined by directly dividing the tangential force by the normal force. This method was widely used in the single-asperity contact, e.g., the nanoscratch simulations [ 34 ] and the microscratch test [ 35 ]. In this work, we studied the effect of scratch depth on the friction coefficient and thus used the second method to calculate the friction coefficient at each scratch depth based on the single-point measurement.…”

Section: Methodology and Model Descriptionmentioning

confidence: 99%

Friction and Wear in Nanoscratching of Single Crystals: Effect of Adhesion and Plasticity

Zeng

2022

Nanomaterials

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Friction and wear are two main tribological behaviors that are quite different for contact surfaces of distinct properties. Conventional studies generally focus on a specific material (e.g., copper or iron) such that the tribological result is not applicable to the other contact systems. In this paper, using a group of virtual materials characterized by coarse-grained potentials, we studied the effect of interfacial adhesion and material plasticity on friction and wear by scratching a rigid tip over an atomic smooth surface. Due to the combined effects of adhesion and plasticity on the nanoscratch process, the following findings are revealed: (1) For shallow contact where interfacial adhesion dominates friction, both friction coefficient and wear rate increase as the adhesion increases to a critical value. For deep contact where plasticity prevails, the variation of friction coefficient and wear rate is limited as the adhesion varies. (2) For weak and strong interfacial adhesions, the friction coefficient exhibits different dependence on the scratch depth, whereas the wear rate becomes higher as the scratch depth increases. (3) As the material hardness increases, both the friction coefficient and wear rate decrease in shallow and deep contacts.

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Section: Methodology and Model Descriptionmentioning

confidence: 99%

Friction and Wear in Nanoscratching of Single Crystals: Effect of Adhesion and Plasticity

Zeng

2022

Nanomaterials

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“…The scratch response of BST ceramics was investigated using Anton Paar microscratch tester MST 2 by either Berkovich (the sharp edge was along the scratch direction: edge-forward orientation) or spherical indenter with radius of 500 μm in the atmospheric environment [74][75][76] under progressively increasing normal load Fn (initial load is 5 mN) and scratching speed of 3 mm/min. Cracking was detected by acoustic emission (AE) signals acquired by the passive Vallen piezoelectric AE sensor (specifications: central frequency of 150 kHz, dynamic range of 65 dBAE, and maximum amplification of 179200X), which can capture acoustic spikes (i.e., micromovements of the sample due to waves generated by sudden events such as cracking) and convert their number to volts that are sent to the software.…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

“…For a higher sensitivity factor, the value of AE signal Va is C×Vi, where Vi is the input signal, and C is the sensitivity factor, and AE (%) value (= Va/Vmax×100%) corresponds to Va divided by the maximum range Vmax of 5 V. Since sample tile can affect scratch response [75,77], surface tilt angle was measured to be 0.15° by the pre-scan of the initial surface profile, resulting in negligible effect of sample tilt.…”

Section: J U S T a C C E P T E Dmentioning

confidence: 99%

Micromechanical characterization of microwave dielectric ceramic BaO–Sm₂O₃–5TiO₂by indentation and scratch methods

Liu¹,

Xu²

2023

Journal of Advanced Ceramics

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Mechanical characterization of dielectric ceramics, which have drawn extensive attention in wireless communication, remains challenging. Micromechanical properties with microstructures of dielectric ceramic BaO-Sm2O3-5TiO2 (BST) were assessed by nanoindentation, microhardness, and microscratch tests under different indenters, along with X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. Accurate determination of elastic modulus (i.e., 260 GPa) and indentation hardness (i.e., J u s t A c c e p t e d 16.2 GPa) of brittle BST ceramic by instrumented indentation technique requires low loads with little indentation-induced damage. Elastic modulus and indentation hardness were analyzed by different methodologies such as energybased and displacement-based approaches, and elastic recovery of Knoop imprint. Consistent values (about 3.1 MPa·m 1/2 ) of fracture toughness of BST ceramic were obtained by different methods such as Vickers indenter-induced cracking method, energy-based nanoindentation approaches, and linear elastic fracture mechanics-based scratch approach with a spherical indenter, demonstrating successful applications of indentation and scratch methods in characterizing fracture properties of brittle solids. The deterioration of elastic modulus or indentation hardness with the increase in indentation load is caused by indentation-induced damage, and can be used to determine fracture toughness of material by energy-based nanoindentation approaches, and the critical void volume fraction is 0.27 (or 0.18) if elastic modulus (or indentation hardness) of the brittle BST ceramic is used. The fracture work at the critical load corresponding to the initial decrease in elastic modulus or indentation hardness can also be used to assess fracture toughness of brittle solids, opening new venues of application of nanoindentation test as a means to characterize fracture toughness of brittle ceramics.

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Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

Liu

Wang

2022

Polym. Bull.

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Influence of Sample Tilt and Applied Load on Microscratch Behavior of Copper Under a Spherical Diamond Indenter

Cited by 17 publications

References 128 publications

Friction and Wear in Nanoscratching of Single Crystals: Effect of Adhesion and Plasticity

Friction and Wear in Nanoscratching of Single Crystals: Effect of Adhesion and Plasticity

Micromechanical characterization of microwave dielectric ceramic BaO–Sm₂O₃–5TiO₂by indentation and scratch methods

Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

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Influence of Sample Tilt and Applied Load on Microscratch Behavior of Copper Under a Spherical Diamond Indenter

Cited by 17 publications

References 128 publications

Friction and Wear in Nanoscratching of Single Crystals: Effect of Adhesion and Plasticity

Friction and Wear in Nanoscratching of Single Crystals: Effect of Adhesion and Plasticity

Micromechanical characterization of microwave dielectric ceramic BaO–Sm2O3–5TiO2by indentation and scratch methods

Effects of sliding velocity on microscratch responses of thermoplastics by Berkovich indenter

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Micromechanical characterization of microwave dielectric ceramic BaO–Sm₂O₃–5TiO₂by indentation and scratch methods