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Articoli di riviste sul tema "Nanoindentation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Jakes, Joseph E., and Donald S. Stone. "Best Practices for Quasistatic Berkovich Nanoindentation of Wood Cell Walls." Forests 12, no. 12 (2021): 1696. http://dx.doi.org/10.3390/f12121696.

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For wood and forest products to reach their full potential as structural materials, experimental techniques are needed to measure mechanical properties across all length scales. Nanoindentation is uniquely suited to probe in situ mechanical properties of micrometer-scale features in forest products, such as individual wood cell wall layers and adhesive bondlines. However, wood science researchers most commonly employ traditional nanoindentation methods that were originally developed for testing hard, inorganic materials, such as metals and ceramics. These traditional methods assume that the te

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2

Mueller, Johannes, Karsten Durst, Dorothea Amberger, and Matthias Göken. "Local Investigations of the Mechanical Properties of Ultrafine Grained Metals by Nanoindentations." Materials Science Forum 503-504 (January 2006): 31–36. http://dx.doi.org/10.4028/www.scientific.net/msf.503-504.31.

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The mechanical properties of ultrafine-grained metals processed by equal channel angular pressing is investigated by nanoindentations in comparison with measurements on nanocrystalline nickel with a grain size between 20 and 400 nm produced by pulsed electrodeposition. Besides hardness and Young’s modulus measurements, the nanoindentation method allows also controlled experiments on the strain rate sensitivity, which are discussed in detail in this paper. Nanoindentation measurements can be performed at indentation strain rates between 10-3 s-1 and 0.1 s-1. Nanocrystalline and ultrafine-graine

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3

Pero, Renato, Giovanni Maizza, Roberto Montanari, and Takahito Ohmura. "Nano-Indentation Properties of Tungsten Carbide-Cobalt Composites as a Function of Tungsten Carbide Crystal Orientation." Materials 13, no. 9 (2020): 2137. http://dx.doi.org/10.3390/ma13092137.

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Tungsten carbide-cobalt (WC-Co) composites are a class of advanced materials that have unique properties, such as wear resistance, hardness, strength, fracture-toughness and both high temperature and chemical stability. It is well known that the local indentation properties (i.e., nano- and micro-hardness) of the single crystal WC particles dispersed in such composite materials are highly anisotropic. In this paper, the nanoindentation response of the WC grains of a compact, full-density, sintered WC-10Co composite material has been investigated as a function of the crystal orientation. Our na

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4

FANG, TE-HUA, WIN-JIN CHANG, CHAO-MING LIN, and CHUN-CHIN CHANG. "CYCLIC NANOINDENTATION OF SEMICONDUCTOR AND METAL THIN FILMS." International Journal of Modern Physics B 23, no. 30 (2009): 5639–47. http://dx.doi.org/10.1142/s0217979209053643.

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The nanoindentation technique was used to measure the hardness and Young's modulus of semiconductor and metal thin films on a Si(100) substrate under cyclic loading. The results showed that in all instances and at a constant cyclic load that the loading curves overlapped the previous unloading curve and had a small displacement after each cyclic nanoindentation. It was observed that the plastic energies of metal materials from the first loading–unloading cycle were much larger than that observed in semiconductor materials. Furthermore, the hardness and Young's modulus of the thin films decreas

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5

Randall, Nicholas X., Matthieu Vandamme, and Franz-Josef Ulm. "Nanoindentation analysis as a two-dimensional tool for mapping the mechanical properties of complex surfaces." Journal of Materials Research 24, no. 3 (2009): 679–90. http://dx.doi.org/10.1557/jmr.2009.0149.

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Instrumented indentation (referred to as nanoindentation at low loads and low depths) has now become established for the single point characterization of hardness and elastic modulus of both bulk and coated materials. This makes it a good technique for measuring mechanical properties of homogeneous materials. However, many composite materials are composed of material phases that cannot be examined in bulk form ex situ (e.g., carbides in a ferrous matrix, calcium silicate hydrates in cements, etc.). The requirement for in situ analysis and characterization of chemically complex phases obviates

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6

Qian, Qiuyu, Hailiang Ma, Ping Fan, et al. "An improved approach to decouple the indentation size effect from nanoindentation hardness of ion-irradiated samples." Journal of Physics: Conference Series 2819, no. 1 (2024): 012044. http://dx.doi.org/10.1088/1742-6596/2819/1/012044.

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Abstract Ion irradiation combined with nanoindentation has been widely used to evaluate the irradiation-hardening effect of materials. Depth-dependent hardening resulting from the non-flat damage profile in heavy-ion irradiation, coupled with the indentation size effect (ISE) in nanoindentations, would further increase the complexity of the extraction of irradiation hardening. In this paper, a simple and reliable approach to decouple the indentation size effect from nanoindentation hardness was proposed based on the modified Nix-Gao model with an extended plastic zone. A hardness dependency wa

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7

Minorl, A. M., E. A. Stach, and J. W. Morris. "Quantitative In-Situ Nanoindentation of Thin Films in a Transmission Electron Microscope." Microscopy and Microanalysis 7, S2 (2001): 912–13. http://dx.doi.org/10.1017/s1431927600030634.

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A unique in situ nanoindentation stage has been built and developed at the National Center for Electron Microscopy in Berkeley, CA. By using piezoceramic actuators to finely position a 3-sided, boron-doped diamond indenter, we are able to image in real time the nanoindentation induced deformation of thin films. Recent work has included the force-calibration of the indenter, using silicon cantilevers to establish a relationship between the voltage applied to the piezoactuators, the displacement of the diamond tip, and the force generated.In this work, we present real time, in situ TEM observati

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8

Donaldson, Laurie. "Novel nanoindentation." Materials Today 16, no. 9 (2013): 310. http://dx.doi.org/10.1016/j.mattod.2013.08.007.

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9

Rar, Andrei, G. M. Pharr, W. C. Oliver, E. Karapetian, and Sergei V. Kalinin. "Piezoelectric nanoindentation." Journal of Materials Research 21, no. 3 (2006): 552–56. http://dx.doi.org/10.1557/jmr.2006.0081.

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Piezoelectric nanoindentation (PNI) has been developed to quantitatively address electromechanical coupling and pressure-induced dynamic phenomena in ferroelectric materials on the nanoscale. In PNI, an oscillating voltage is applied between the back side of the sample and the indenter tip, and the first harmonic of bias-induced surface displacement at the area of indenter contact is detected. PNI is implemented using a standard nanoindentation system equipped with a continuous stiffness measurement system. The piezoresponse of polycrystalline lead zirconate titanate (PZT) and BaTiO3 piezocera

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10

Zhou, Hong Xiu, Ming Lei Li, Neng Dong Duan, et al. "Nanotwinned Surface on a Ternary Titanium Alloy with Increased Hardness Induced under Nanoindentations." Materials Science Forum 874 (October 2016): 323–27. http://dx.doi.org/10.4028/www.scientific.net/msf.874.323.

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A nanotwinned surface is formed on a titanium alloy under nanoindentations. Prior to nanoindentation, blocks of a ternary titanium alloy are machined by chemical mechanical polishing. The surface roughness Ra and peak-to-valley values are 1.135 nm and 8.82 nm, respectively. The hardness in the indented surface is greatly increased, indicated from the load-displacement curves compared to the polished surfaces. Nanotwins are confirmed using transmission electron microscopy. The nanotwinned surface is uniformly generated by nanoindentations at room temperature, which is different from previous fi

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11

Kaufman, Jessica D., Gregory J. Miller, Elise F. Morgan, and Catherine M. Klapperich. "Time-dependent mechanical characterization of poly(2-hydroxyethyl methacrylate) hydrogels using nanoindentation and unconfined compression." Journal of Materials Research 23, no. 5 (2008): 1472–81. http://dx.doi.org/10.1557/jmr.2008.0185.

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Hydrogels pose unique challenges to nanoindentation including sample preparation, control of experimental parameters, and limitations imposed by mechanical testing instruments and data analysis originally intended for harder materials. The artifacts that occur during nanoindentation of hydrated samples have been described, but the material properties obtained from hydrated nanoindentation have not yet been related to the material properties obtained from macroscale testing. To evaluate the best method for correlating results from microscale and macroscale tests of soft materials, nanoindentati

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12

Dragatogiannis, Dimitrios A., Elias P. Koumoulos, Ioannis A. Kartsonakis, and Costas A. Charitidis. "Deformation mechanism during nanoindentation creep and corrosion resistance of Zn." International Journal of Structural Integrity 7, no. 1 (2016): 47–69. http://dx.doi.org/10.1108/ijsi-07-2014-0034.

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Purpose – The study of nanoindentation as a reliable method to extract creep properties as well as for fundamental understanding of deformation mechanisms at small length scales is an open interesting field. The observed creep behavior is attributed to time-dependent plastic deformation based on loading rates. There is a lot of work in the field of nanoindentation in order to understand the dynamic effects on nanomechanical properties. The paper aims to discuss these issues. Design/methodology/approach – The deformation mechanism is investigated under two experimental approaches (high and low

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13

Le Bourhis, E., G. Patriarche, L. Largeau, and J. P. Rivière. "Polarity-induced changes in the nanoindentation response of GaAs." Journal of Materials Research 19, no. 1 (2004): 131–36. http://dx.doi.org/10.1557/jmr.2004.19.1.131.

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We studied the polarity-induced changes in the nanoindentation response of GaAs{111}. The nanoindentations were made under a large range of loads (Fmax between 0.2 mN and 50 mN) at room temperature on {111} faces of A (Ga) or B (As) character. The loading–unloading curves were compared first, with special attention addressed to pop-in events and hardness values (reported previously for microindentation). Transmission electron microscopy was used to observe the nanoindentation structures generated at the two polar surfaces. The size of the dense plastic zone generated around the indent site was

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14

KUMAR, AMIT, and KAIYANG ZENG. "ALTERNATIVE METHODS TO EXTRACT THE HARDNESS AND ELASTIC MODULUS OF THIN FILMS FROM NANOINDENTATION LOAD-DISPLACEMENT DATA." International Journal of Applied Mechanics 02, no. 01 (2010): 41–68. http://dx.doi.org/10.1142/s1758825110000445.

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This paper presents alternative analysis methodologies to extract the elastic modulus and hardness of the ultra-thin films from nanoindentation load-displacement data, especially when the film thickness is only few hundred nanometers or less. At such film thickness, the conventional analysis methods for nanoindentation usually do not give accurate film properties due to the substrate effect. The new methods are capable to show how to determine the film-only properties and how the substrates affect the nanoindentation measurement, especially for ultra thin films. These methods give accurate res

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15

Yu, Yunhong, Gang Xu, Tianling Wang, Huimin Chen, Houzhi Wang, and Jun Yang. "Analysis of Nanoindentation Test Results of Asphalt Mixture with Different Gradations." Applied Sciences 11, no. 17 (2021): 7992. http://dx.doi.org/10.3390/app11177992.

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Nanoindentation has been applied in the field of asphalt mixtures, but, at the nano-scale, changes in the composition of the mixture and material properties can have a significant impact on the results. Therefore, it is necessary to investigate the feasibility of nanoindentation tests on different types of asphalt mixtures with different gradations and the influence of material properties and test methods on nanoindentation results. In this paper, the nanoindentation test results on three kinds of asphalt mixture (AC-13, SMA-13, and OGFC-13) with different aggregate gradations were investigate

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16

Csach, Kornel, Jozef Miškuf, Alena Juríková, Maria Hurakova, Václav Ocelík, and Jeff T. M. de Hosson. "Nanoindentation in Metallic Glasses with Different Plasticity." Key Engineering Materials 662 (September 2015): 19–22. http://dx.doi.org/10.4028/www.scientific.net/kem.662.19.

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Nanoindentation and thermomechanical experiments on three types of metallic glasses with different glass forming ability were carried out. The nanoindentation behaviour at room temperature was associated with the creep at elevated temperatures. Different discontinuity populations and their shape observed on the nanoindentation loading curves were compared with morphology of plastic deformed indent regions. The influence of the differences in thermal stability of studied alloys on the nanoindentation in these alloys were studied as well.

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17

Basu, Sandip, Alexander Moseson, and Michel W. Barsoum. "On the determination of spherical nanoindentation stress–strain curves." Journal of Materials Research 21, no. 10 (2006): 2628–37. http://dx.doi.org/10.1557/jmr.2006.0324.

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Instrumented nanoindentation experiments, especially with sharp tips, are a well-established technique to measure the hardness and moduli values of a wide range of materials. However, and despite the fact that they can accurately delineate the onset of the elasto-plastic transition of solids, spherical nanoindentation experiments are less common. In this article we propose a technique in which we combine (i) the results of continuous stiffness measurements with spherical indenters – with radii of 1 μm and/or 13.5 μm, (ii) Hertzian theory, and (iii) Berkovich nanoindentations, to convert load/d

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18

Kanders, U., and K. Kanders. "Nanoindentation Response analysis of Thin Film Substrates-I: Strain Gradient-Divergence Approach." Latvian Journal of Physics and Technical Sciences 54, no. 1 (2017): 66–76. http://dx.doi.org/10.1515/lpts-2017-0007.

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Abstract Nanoindentation is a widely-used method for sensitive exploration of the mechanical properties of micromechanical systems. We derive a simple empirical analysis technique to extract stress-strain field (SSF) gradient and divergence representations from nanoindentation data sets. Using this approach, local SSF gradients and structural heterogeneities can be discovered to obtain more detail about the sample’s microstructure, thus enhancing the analytic capacity of the nanoindentation technique. We demonstrate the application of the SSF gradient-divergence analysis approach to nanoindent

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19

Herbert, E. G., W. C. Oliver, A. Lumsdaine, and G. M. Pharr. "Measuring the constitutive behavior of viscoelastic solids in the time and frequency domain using flat punch nanoindentation." Journal of Materials Research 24, no. 3 (2009): 626–37. http://dx.doi.org/10.1557/jmr.2009.0089.

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The purpose of this work is to further develop experimental methodologies using flat punch nanoindentation to measure the constitutive behavior of viscoelastic solids in the frequency and time domain. The reference material used in this investigation is highly plasticized polyvinylchloride (PVC) with a glass transition temperature of −17 °C. The nanoindentation experiments were conducted using a 983-μm-diameter flat punch. For comparative purposes, the storage and loss modulus obtained by nanoindentation with a 103-μm-diameter flat punch and dynamic mechanical analysis are also presented. Over

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20

Nagy, Péter M., P. Horváth, Gábor Pető, and Erika Kálmán. "Nanoindentation of Silicon." Materials Science Forum 604-605 (October 2008): 29–36. http://dx.doi.org/10.4028/www.scientific.net/msf.604-605.29.

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The nanoindentation behaviours of single crystalline silicon samples has gained wide attention in recent years, because of the anomaly effects in the loading curve, caused by the pressure induced phase transformation of silicon. To further enlighten the phenomenon bulk, ion-implanted, single crystalline Si samples have been studied by nanoindentation and by atomic force microscopy. The implantation of Si wafers was carried out by P+ ions at 40 KeV accelerating voltage and 80 ions/cm2 dose, influencing the defect density and structure of the Si material in shallow depth at the surface. Our expe

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21

Cakmak, Umut D., Thomas Schöberl, and Zoltan Major. "Nanoindentation of polymers." Meccanica 47, no. 3 (2011): 707–18. http://dx.doi.org/10.1007/s11012-011-9481-6.

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22

Bull, S. J. "Nanoindentation of coatings." Journal of Physics D: Applied Physics 38, no. 24 (2005): R393—R413. http://dx.doi.org/10.1088/0022-3727/38/24/r01.

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23

Lu, Duhui, Jianliang Liu, Mukai Wang, and Sen Gu. "State-of-the-Art Design and Optimization of Strain Gauge-Type Load–Displacement Transducer for in In Situ Nanoindentation Systems." Sensors 25, no. 3 (2025): 609. https://doi.org/10.3390/s25030609.

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Force–displacement transducers are key components in in situ nanoindentation systems. The current existing capacitance-type transducers adopted in state-of-the-art commercial in situ nanoindentation systems are restricted by limited maximum ranges, and strain gauge-type transducers in the current in situ nanoindentation systems have the limitation of low resolution and high values of mass. In the paper, we propose a mechanical design and improvement of a low-mass strain gauge-type force–displacement transducer capable of performing high resolution in situ nanoindentation measurements. The tran

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24

Yeo, Chang-Dong, and Andreas A. Polycarpou. "A correction to the nanoindentation technique for ultrashallow indenting depths." Journal of Materials Research 22, no. 9 (2007): 2359–62. http://dx.doi.org/10.1557/jmr.2007.0300.

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A correction to the nanoindentation technique taking into account the elastic recovery at extremely shallow contact depths was proposed. Using a high-sensitivity nanoindentation system with a sharp indenting tip, the magnitude of the elastic recovery could be obtained directly from very low-force load–unload curves, which was then used to correct the contact area used for hardness measurements. Nanoindentation experiments were performed on a standard fused quartz sample and, compared to standard nanoindentation techniques, the proposed method was found to be more accurate at ultrashallow inden

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25

Nazemian, M., M. Chamani, and M. Baghani. "A Combined Experimental and Numerical Study of the Effect of Surface Roughness on Nanoindentation." International Journal of Applied Mechanics 11, no. 07 (2019): 1950070. http://dx.doi.org/10.1142/s1758825119500704.

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Gold and copper thin films are widely used in microelectromechanical system (MEMS) and nanoelectromechanical system (NEMS) devices. Nanoindentation has been developed in mechanical characterization of thin films in recent years. Several researchers have examined the effect of surface roughness on nanoindentation results. It is proved that the surface roughness has great importance in nanoindentation of thin films. In this paper, the surface topography of thin films is simulated using the extracted data from the atomic force microscopy (AFM) images. Nanoindentation on a rough surface is simulat

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26

Raupach, Kristina, Andreas Bogner, Michael Vogel, Engin Kotan, and Frank Dehn. "Systematic Experimental Investigation into the Determination of Micromechanical Properties of Hardened Cement Paste Using Nanoindentation—Opportunities and Limitations." Materials 16, no. 4 (2023): 1420. http://dx.doi.org/10.3390/ma16041420.

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The nanoindentation technique is already widely applied in the mechanical characterization of the microstructure of thin films with respect to different materials. Generally, by means of nanoindentation, the hardness and the elastic modulus of materials can be determined with high precision. The focus of these analyses is usually on the materials from the metal, ceramic, and plastics processing industry. The application of nanoindentation in construction science, especially in concrete technology, is a relatively new field of investigation. This study deals with the basic application of nanoin

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27

Chang, Li, and Liang Chi Zhang. "A Note on the Unloading Behavior of Silicon Subjected to Nanoindentation." Advanced Materials Research 76-78 (June 2009): 398–403. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.398.

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It is known that silicon, during nanoindentation unloading, undergoes various phase transformations beneath the indenter. Investigations into the details are however not available. This paper studies the unloading behavior of silicon subjected to cyclic nanoindentations. The results show that the elastic unloading behavior of the material can be described by a power relationship, P = α∙hm, where P is the load, h is the elastic displacement, and α and m are material constants. It was found that the values of α and m were almost independent of the phase transition events, indicating that the ela

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28

Long, Xu, Xiaodi Zhang, Wenbin Tang, Shaobin Wang, Yihui Feng, and Chao Chang. "Calibration of a Constitutive Model from Tension and Nanoindentation for Lead-Free Solder." Micromachines 9, no. 11 (2018): 608. http://dx.doi.org/10.3390/mi9110608.

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It is challenging to evaluate constitutive behaviour by using conventional uniaxial tests for materials with limited sizes, considering the miniaturization trend of integrated circuits in electronic devices. An instrumented nanoindentation approach is appealing to obtain local properties as the function of penetration depth. In this paper, both conventional tensile and nanoindentation experiments are performed on samples of a lead-free Sn–3.0Ag–0.5Cu (SAC305) solder alloy. In order to align the material behaviour, thermal treatments were performed at different temperatures and durations for al

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Naimi-Jamal, M. R., and G. Kaupp. "Quantitative evaluation of nanoindents: Do we need more reliable mechanical parameters for the characterization of materials?" International Journal of Materials Research 96, no. 11 (2005): 1226–36. http://dx.doi.org/10.1515/ijmr-2005-0214.

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Abstract Various sources of errors in the standard procedure according to the ISO 14577 draft for the iteration of elastic modulus and hardness of solid materials, with reference to fused quartz with its particular and unique indentation response, are pointed out on the basis of practical examples. Similar objections exist towards the use of the S 2 F N – 1 parameter, where S is the stiffness and F N is the normal force. It is suggested to use unambiguous mechanic characterization (at least additionally) by quantitative analysis of the loading curves in nanoindentations. These exhibit a genera

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Shu, S. Q., Y. Yang, T. Fu, C. S. Wen, and J. Lu. "Can Young’s modulus and hardness of wire structural materials be directly measured using nanoindentation?" Journal of Materials Research 24, no. 3 (2009): 1054–58. http://dx.doi.org/10.1557/jmr.2009.0079.

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In recent studies, nanoindentation experiments combined with the Oliver and Pharr method (OP method) are frequently used to measure the mechanical properties of “one-dimensional” structural materials (micro/nanowires and nanobelts) regardless of the corresponding assumptions of the OP method. This article reports the numerical simulation studies of the nanoindentations of wire structural materials on elastic-plastic substrates using dimensional analysis and the finite element method. We find that the measured hardness and Young’s modulus of wire structural materials are significantly influence

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Nguyen, Pham T. N., Fazilay Abbès, Jean-Sébastien Lecomte, Christophe Schuman, and Boussad Abbès. "Inverse Identification of Single-Crystal Plasticity Parameters of HCP Zinc from Nanoindentation Curves and Residual Topographies." Nanomaterials 12, no. 3 (2022): 300. http://dx.doi.org/10.3390/nano12030300.

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This paper investigates the orientation-dependent characteristics of pure zinc under localized loading using nanoindentation experiments and crystal plasticity finite element (CPFEM) simulations. Nanoindentation experiments on different grain orientations exhibited distinct load–depth responses. Atomic force microscopy revealed two-fold unsymmetrical material pile-up patterns. Obtaining crystal plasticity model parameters usually requires time-consuming micromechanical tests. Inverse analysis using experimental and simulated loading–unloading nanoindentation curves of individual grains is comm

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Cohen, Sidney R., and Estelle Kalfon-Cohen. "Dynamic nanoindentation by instrumented nanoindentation and force microscopy: a comparative review." Beilstein Journal of Nanotechnology 4 (November 29, 2013): 815–33. http://dx.doi.org/10.3762/bjnano.4.93.

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Viscoelasticity is a complex yet important phenomenon that drives material response at different scales of time and space. Burgeoning interest in nanoscale dynamic material mechanics has driven, and been driven by two key techniques: instrumented nanoindentation and atomic force microscopy. This review provides an overview of fundamental principles in nanoindentation, and compares and contrasts these two techniques as they are used for characterization of viscoelastic processes at the nanoscale.

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Wasmer, Kilian, Cédric Pouvreau, Jean-Marc Breguet, Johann Michler, Daniel Schulz, and Jacques Henri Giovanola. "Nanoindentation cracking in gallium arsenide: Part I. In situ SEM nanoindentation." Journal of Materials Research 28, no. 20 (2013): 2785–98. http://dx.doi.org/10.1557/jmr.2013.252.

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Kovář, Jaroslav, Vladimír Fuis, and Jan Tomáštík. "INFLUENCING THE INDENTATION CURVES BY THE BLUNTNESS OF THE BERKOVICH INDENTER AT THE FEM MODELLING." Acta Polytechnica CTU Proceedings 27 (June 11, 2020): 131–35. http://dx.doi.org/10.14311/app.2020.27.0131.

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The influence of the Berkovich indenter bluntness on the indentation curves at nanoindentation test of fused silica is determined by the FEM (finite element method) in this paper. The Berkovich indenter, which is mostly used for the nanoindentation test, was assumed for calculations. The indenter is always blunted in real tests. The bluntness of the indenter has an influence on the results of the nanoindentation test. The combination of the nanoindentation test and the FE modelling can be used for the calculation of the parameters of fused silica plasticity and estimation of the bluntness of t

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Bontempi, Marco, Gregorio Marchiori, Mauro Petretta та ін. "Nanomechanical Mapping of Three Dimensionally Printed Poly-ε-Caprolactone Single Microfibers at the Cell Scale for Bone Tissue Engineering Applications". Biomimetics 8, № 8 (2023): 617. http://dx.doi.org/10.3390/biomimetics8080617.

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Poly-ε-caprolactone (PCL) has been widely used in additive manufacturing for the construction of scaffolds for bone tissue engineering. However, its use is limited by its lack of bioactivity and inability to induce cell adhesion, hence limiting bone tissue regeneration. Biomimicry is strongly influenced by the dynamics of cell–substrate interaction. Thus, characterizing scaffolds at the cell scale could help to better understand the relationship between surface mechanics and biological response. We conducted atomic force microscopy-based nanoindentation on 3D-printed PCL fibers of ~300 µm thic

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Tsui, T. Y., W. C. Oliver, and G. M. Pharr. "Influences of stress on the measurement of mechanical properties using nanoindentation: Part I. Experimental studies in an aluminum alloy." Journal of Materials Research 11, no. 3 (1996): 752–59. http://dx.doi.org/10.1557/jmr.1996.0091.

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The influence of applied stress on the measurement of hardness and elastic modulus using nanoindentation methods has been experimentally investigated using special specimens of aluminum alloy 8009 to which controlled stresses could be applied by bending. When analyzed according to standard methods, the nanoindentation data reveal changes in hardness with stress similar to those observed in conventional hardness tests. However, the same analysis shows that the elastic modulus changes with stress by as much as 10%, thus suggesting that the analysis procedure is somehow deficient. Comparison of t

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37

Colak, Ozgen U., and Ardavan Zandiatashbar. "Fabrication of Graphene Platelet (GPL)-Epoxy Nanocomposites and Characterization by Nanoindentation." Advanced Materials Research 445 (January 2012): 809–14. http://dx.doi.org/10.4028/www.scientific.net/amr.445.809.

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Main objective of this work is to manufacture the graphene platelet (GPL)-epoxy nanocomposite and to characterize the nanocomposite using nanoindentation technique. Thermal reduction of graphite oxide is the method used to obtain bulk quantities of graphene platelets (GPL) which comprise multiple graphene sheets. Dispersion of GPL in epoxy matrix is done with sonication and high speed shear mixing is used for mixing curing agent and resin. Following the manufacturing of graphene platelet-epoxy nanocomposites, characterization of the material was performed by nanoindentation. Nanoindentation ex

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38

Wan Yusoff, Wan Yusmawati, Azman Jalar, Norinsan Kamil Othman, and Irman Abdul Rahman. "Nanoindentation Study on Heat Treated Gold Wire Bonding." Materials Science Forum 857 (May 2016): 31–35. http://dx.doi.org/10.4028/www.scientific.net/msf.857.31.

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The effect of high temperature storage of gold ball bonds towards micromechanical properties has been investigated. Gold wire from thermosonic wire bonding exposed to high temperature storage at 150 °C for 10, 100 and 1000 hours. The nanoindentation test was used in order to evaluate the high temperature storage effect on wire bonding in more details and localized. Prior to nanoindentation test, the specimens were cross-sectioned diagonally. The constant load nanoindentation was performed at the center of gold ball bond to investigate the hardness and reduced modulus. The load-depth curve of n

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39

Cabibbo, Marcello. "Instrumented Nanoindentation Tests Applied to Bulk Metallic Materials: From Calibration Issue to Pile-Up Phenomena." Materials 14, no. 21 (2021): 6360. http://dx.doi.org/10.3390/ma14216360.

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Abstract (sommario):

Instrumented nanoindentation tests have reached an effective level of theoretical and practical knowledge to become an interesting and useful tool for determining hardness, H, and local elasticity (reduced Young’s modulus), Er, of a variety of materials, from coatings and thin films to bulk metallic materials. Nanoindentation instruments are equipped with analysis software for raw data for hardness and reduced Young’s modulus evaluation, generally based on the Oliver and Pharr analysis method. On the other hand, it is widely known and recognized that prior data acquisition, a tip-dependent cal

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40

Carrillo, Fernando, Shikha Gupta, Mehdi Balooch, et al. "Nanoindentation of polydimethylsiloxane elastomers: Effect of crosslinking, work of adhesion, and fluid environment on elastic modulus." Journal of Materials Research 20, no. 10 (2005): 2820–30. http://dx.doi.org/10.1557/jmr.2005.0354.

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Abstract (sommario):

With the potential to map mechanical properties of heterogeneous materials on a micrometer scale, there is growing interest in nanoindentation as a materials characterization technique. However, nanoindentation has been developed primarily for characterization of hard, elasto-plastic materials, and the technique has not been validated for very soft materials with moduli less than 5 MPa. The current study attempted to use nanoindentation to characterize the elastic moduli of soft, elastomeric polydimethylsiloxane (PDMS) samples (with different degrees of crosslinking) and determine the effects

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41

Zhou, Mingxing, Zunqiang Fan, Zhichao Ma, et al. "Effects of Flotage on Immersion Indentation Results of Bone Tissue: An Investigation by Finite Element Analysis." Advances in Materials Science and Engineering 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/4569351.

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Abstract (sommario):

In reality, nanoindentation test is an efficient technique for probing the mechanical properties of biological tissue that soaked in the liquid media to keep the bioactivity. However, the effects of flotage imposed on the indenter will lead to inaccuracy when calculating mechanical properties (for instance, elastic modulus and hardness) by using depth-sensing nanoindentation. In this paper, the effects of flotage on the nanoindentation results of cortical bone were investigated by finite element analysis (FEA) simulation. Comparisons of nanoindentation simulation results of bone samples with a

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42

Lee, Hun Kee, Seong Hyun Ko, and Hyun Chul Park. "On the Size Effect in Hardness by Nanoindentation Method." Key Engineering Materials 306-308 (March 2006): 911–16. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.911.

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Abstract (sommario):

A model describing nanoindentation as plastic deformation resulting from a strain gradient is investigated. Using a simplified axisymmetric nanoindentation, the effective strain gradient for indentation depth is derived. The proposed indentation model is a modification of Nix and Gao’s model (1998) . To validate this approach for nanoindentation, solutions for depth-dependent hardness of single various materials such as Cu, Al, Ni are compared with experiments. Results show that the proposed model agrees well with the hardness experiments.

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43

Long, Xu, Ruipeng Dong, Yutai Su, and Chao Chang. "Critical Review of Nanoindentation-Based Numerical Methods for Evaluating Elastoplastic Material Properties." Coatings 13, no. 8 (2023): 1334. http://dx.doi.org/10.3390/coatings13081334.

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Abstract (sommario):

It is well known that the elastoplastic properties of materials are important indicators to characterize their mechanical behaviors and are of guiding significance in the field of materials science and engineering. In recent years, the rapidly developing nanoindentation technique has been widely used to evaluate various intrinsic information regarding the elastoplastic properties and hardness of various materials such as metals, ceramics, and composites due to its high resolution, versatility, and applicability. However, the nanoindentation process of indenting materials on the nanoscale provi

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44

Prošek, Zdeněk, Jaroslav Topič, Pavel Tesárek, et al. "Micromechanical Properties of Spruce Tissues Using Static Nanoindentation and Modulus Mapping." Applied Mechanics and Materials 732 (February 2015): 115–18. http://dx.doi.org/10.4028/www.scientific.net/amm.732.115.

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Abstract (sommario):

This paper discusses characterization of physical and mechanical properties of tissues of Norway spruce. Cell wall is composed of several layers, which is, due to their small size, difficult to characterize. For this reason, the work uses a combination of methods, atomic force microscopy (AFM) and nanoindentation. AFM is used to determine the topography of samples and nanoindentation to determine micromechanical properties of wood tissues. Prepared samples of glue laminated timber were tested by quasi-static and dynamic nanoindentation (modulus mapping technique) method.

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45

Jeng, Yeau-Ren, and Chung-Ming Tan. "Static Atomistic Simulations of Nanoindentation and Determination of Nanohardness." Journal of Applied Mechanics 72, no. 5 (2005): 738–43. http://dx.doi.org/10.1115/1.1988349.

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Abstract (sommario):

This paper develops a nonlinear finite element formulation to analyze nanoindentation using an atomistic approach, which is conducive to observing the deformation mechanisms associated with the nanoindentation cycle. The simulation results of the current modified finite element formulation indicate that the microscopic plastic deformations of the thin film are caused by instabilities of the crystalline structure, and that the commonly used procedure for estimating the contact area in nanoindentation testing is invalid when the indentation size falls in the nanometer regime.

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46

Lin, J., X. Y. Niu, and X. F. Shu. "Reverse Analysis for Determining the Mechanical Properties of Zeolite Ferrierite Crystal." Journal of Nanomaterials 2008 (2008): 1–7. http://dx.doi.org/10.1155/2008/395738.

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Abstract (sommario):

In order to explore more mechanical properties of zeolite Ferrierite (FER) single crystal, a method of determining its mechanical properties—nanoindentation reverse analysis—was obtained based on the nanoindentation experiment and numerical simulations, and this will be presented in this paper. The yield stress and the characteristic work-hardening rate were gained if its stress-strain relation was a bilinear constitutive relation. The mechanical parameters obtained by reverse analysis have been compared with ones gained by nanoindentation finite-element numerical simulations.

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47

Zlámal, Petr, Tomáš Doktor, Petr Koudelka, et al. "Inspection of Local Influenced Zones in Micro-Scale Aluminium Specimens." Key Engineering Materials 606 (March 2014): 39–42. http://dx.doi.org/10.4028/www.scientific.net/kem.606.39.

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Abstract (sommario):

This study is focused on detection and characterisation of influenced zones in micro-scale specimens of aluminium foam after thermal and mechanical loading induced by preparation process for three-point bending test. Two cell-wall specimens were prepared from a slab of aluminium foam and influences of preparation process (machining) and thermal load on local mechanical properties were investigated using nanoindentation. Although the nanoindentation is powerful method for investigation of material properties of small zones, it can be reliably used only to obtain information about elastic proper

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48

Duan, Yunbiao, Danyu Jiang, and Jin Hu. "Determination of the load-independent hardness by analyzing the nanoindentation loading curves: A case study on fused silica." Journal of Advanced Ceramics 8, no. 4 (2019): 583–86. http://dx.doi.org/10.1007/s40145-019-0355-z.

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Abstract (sommario):

AbstractThe nanoindentation loading curves measured on fused silica were analyzed based on the theoretical relationship derived by Malzbender et al. (J Mater Res 2000, 15: 1209–1212). It was found that the ratio of the applied load to the square of the displacement, P/(h + hd)2, does not keep constant during loading segment of the nanoindentation test. Considering the existence of the indentation size effect, an empirical method for the determination of the load-independent hardness by analyzing the nanoindentation loading curves was proposed.

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49

Hoan, Pham Thai, and Ngo Tri Thuong. "Microstructural characteristics of ultra-high performance concrete by grid nanoindentation and statistical analysis." Journal of Science and Technology in Civil Engineering (STCE) - NUCE 15, no. 1 (2021): 90–101. http://dx.doi.org/10.31814/stce.nuce2021-15(1)-08.

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Abstract (sommario):

In this study, grid nanoindentation and statistical deconvolution analysis were applied into a developed Ultra-high performance concrete (UHPC) to broaden the understanding of the microstructure phases and their mechanical properties. A total of 550 nanoindentation tests was carried out on UHPC and the mechanical properties, including indentation modulus and hardness of the indented material were extracted from nanoindentation load-depth curves. The statistical deconvolution analysis was then utilized to analyze the modulus and hardness spectra. The experimental and analysis results revealed t

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50

Miyake, Shojiro, Takanori Shindo, and Masatoshi Miyake. "Regression Analysis of the Effect of Bias Voltage on Nano- and Macrotribological Properties of Diamond-Like Carbon Films Deposited by a Filtered Cathodic Vacuum Arc Ion-Plating Method." Journal of Nanomaterials 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/657619.

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Abstract (sommario):

Diamond-like carbon (DLC) films are deposited by bend filtered cathodic vacuum arc (FCVA) technique with DC and pulsed bias voltage. The effects of varying bias voltage on nanoindentation and nanowear properties were evaluated by atomic force microscopy. DLC films deposited with DC bias voltage of −50 V exhibited the greatest hardness at approximately 50 GPa, a low modulus of dissipation, low elastic modulus to nanoindentation hardness ratio, and high nanowear resistance. Nanoindentation hardness was positively correlated with the Raman peak ratioId/Ig, whereas wear depth was negatively correl

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