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Journal articles on the topic 'Indentation cracking'

Author: Grafiati

Published: 23 November 2024

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1

Subhash, Ghatu, and Hongwen Zhang. "Dynamic indentation response of ZrHf-based bulk metallic glasses." Journal of Materials Research 22, no. 2 (2007): 478–85. http://dx.doi.org/10.1557/jmr.2007.0058.

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Static and dynamic Vickers indentations were performed on ZrHf-based bulk amorphous alloys. A decrease in indentation hardness was observed at higher strain rates compared with static indentation hardness. For equivalent loads, dynamic indentations produced more severe deformation features on the loading surface than static indentations. Using bonded interface technique, the induced shear band patterns beneath the indentations were studied. In static indentations, the majority of the deformation was primarily accommodated by closely spaced semicircular shear bands surrounding the indentation.

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2

Yamazaki, Yasuhiro. "Investigation of the Cracking Behaviors by Indentation Based on an In Situ Observation." Key Engineering Materials 627 (September 2014): 361–64. http://dx.doi.org/10.4028/www.scientific.net/kem.627.361.

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In this paper, an in-situ measurement of crack size as a function of applied indentation load during indentation test was conducted. To perform the in-situ measurement, an instrumented indentation test machine with the in-situ observation system was developed and used. The joints of transparent ceramics by diffusion bonding were prepared as the specimen used in this study. The indentations were performed at the interface of the joints, and in the monolithic transparent ceramics by means of the instrumented indenter with the in-situ observation system. The relationship between crack shape and i

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3

Abudaia, F. B., J. T. Evans, and B. A. Shaw. "Spherical indentation fatigue cracking." Materials Science and Engineering: A 391, no. 1-2 (2005): 181–87. http://dx.doi.org/10.1016/j.msea.2004.08.068.

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4

Newman, A., T. Jewett, S. Sampath, C. Berndt, and H. Herman. "Indentation Response of Molybdenum Disilicide." Journal of Materials Research 13, no. 9 (1998): 2662–71. http://dx.doi.org/10.1557/jmr.1998.0371.

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The influence of microstructure on the indentation cracking behavior of molybdenum disilicide (MoSi2) has been examined. The indentation response of samples produced by various methods has been measured to examine the elastic/plastic nature, hardness, and fracture toughness. Fracture toughness comparisons were made by measuring indentation crack lengths, observing the elastic/plastic indentation response, and quantifying the differences in the indentation cracking behavior. Further information was gained by monitoring the acoustic activity during indentation for selected specimens. It has been

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5

Padture, Nitin P. "Postfailure subsidiary cracking from indentation flaws in brittle materials." Journal of Materials Research 8, no. 6 (1993): 1411–17. http://dx.doi.org/10.1557/jmr.1993.1411.

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Vickers indentation sites in ceramics have been examined after specimen failure from median/radial indentation cracks. Evolution of a new cracking pattern of “ortho-lateral” cracks, originating at the intact corners of the Vickers indentation and running orthogonal to the classic-lateral cracks and parallel to the new fracture surface, has been observed. In some instances postfailure extension of the classic-lateral cracks toward the surface was also observed. Enhanced residual tensile stress from relaxation of constraints on the indentation-plastic cavity by the generation of a fracture surfa

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6

Baran, G., W. Shin, A. Abbas, and S. Wunder. "Indentation Cracking of Composite Matrix Materials." Journal of Dental Research 73, no. 8 (1994): 1450–56. http://dx.doi.org/10.1177/00220345940730080901.

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Composite restorative materials wear by a fatigue mechanism in the occlusal contact area. Here, tooth cusps and food debris cyclically indent the restoration. Modeling this phenomenon requires an understanding of material response to indentation. The question in this study was whether material response depends on indenter size and geometry, and also, whether polymers used in restorative materials should be considered elastic and brittle, or plastic and ductile for modeling purposes. Three resins used as matrices in proprietary restorative composites were the experimental materials. To ascertai

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7

Sellappan, P., T. Rouxel, F. Celarie, E. Becker, P. Houizot, and R. Conradt. "Composition dependence of indentation deformation and indentation cracking in glass." Acta Materialia 61, no. 16 (2013): 5949–65. http://dx.doi.org/10.1016/j.actamat.2013.06.034.

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8

Jiang, L. Z., and C. T. Sun. "Analysis of indentation cracking in piezoceramics." International Journal of Solids and Structures 38, no. 10-13 (2001): 1903–18. http://dx.doi.org/10.1016/s0020-7683(00)00142-6.

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9

Buijs, Maarten, and Liesan A. A. G. Martens. "Effect of Indentation Interaction on Cracking." Journal of the American Ceramic Society 75, no. 10 (1992): 2809–14. http://dx.doi.org/10.1111/j.1151-2916.1992.tb05509.x.

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10

Cook, Robert F., and Eric G. Liniger. "Kinetics of Indentation Cracking in Glass." Journal of the American Ceramic Society 76, no. 5 (1993): 1096–105. http://dx.doi.org/10.1111/j.1151-2916.1993.tb03726.x.

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11

Behnamghader, Aliasghar, Reyhaneh Neghabat Shirazi, Alain Iost, and Denis Najjar. "Surface Cracking and Degradation of Dense Hydroxyapatite through Vickers Microindentation Testing." Applied Mechanics and Materials 66-68 (July 2011): 614–19. http://dx.doi.org/10.4028/www.scientific.net/amm.66-68.614.

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Surface degradation and cracking of dense hydroxyapatite were evaluated through Vickers micro indentation using indentation loads ranged from 25 gf to 2000 gf. Crack lengths, imprint diameters and the number of lateral cracks and chips were measured using SEM. The crack length-indentation load data were analyzed with regard to the specific relations of Palmqvist and fully developed radial cracks. Crack type transition load from Palmqvist to median crack was experimentally assessed through serial sectioning technique. The analytical estimated transition load, based on the theoretical relation o

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12

Mostafavi, Mahmoud, Yelena Vertyagina, Christina Reinhard, et al. "3D Studies of Indentation by Combined X-Ray Tomography and Digital Volume Correlation." Key Engineering Materials 592-593 (November 2013): 14–21. http://dx.doi.org/10.4028/www.scientific.net/kem.592-593.14.

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Hardness testing obtains material properties from small specimens via measurement of load-displacement response to an imposed indentation; it is a surface characterisation technique so, except in optically transparent materials, there is no direct observation of the assumed damage and deformation processes within the material. Three-dimensional digital image correlation (digital volume correlation) is applied to study deformation beneath indentations, mapping the relative displacements between high-resolution synchrotron X-ray computed tomographs (0.9 μm voxel size). Two classes of material ar

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13

Chen, Xi, John W. Hutchinson, and Anthony G. Evans. "The Mechanics of Indentation Induced Lateral Cracking." Journal of the American Ceramic Society 88, no. 5 (2005): 1233–38. http://dx.doi.org/10.1111/j.1551-2916.2005.00281.x.

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14

GREEN, D. J., and B. R. MALONEY. "Influence of Surface Stress on indentation Cracking." Journal of the American Ceramic Society 69, no. 3 (1986): 223–25. http://dx.doi.org/10.1111/j.1151-2916.1986.tb07412.x.

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15

Rouxel, Tanguy, Pathikumar Sellappan, Fabrice Célarié, Patrick Houizot, and Jean-Christophe Sanglebœuf. "Toward glasses with better indentation cracking resistance." Comptes Rendus Mécanique 342, no. 1 (2014): 46–51. http://dx.doi.org/10.1016/j.crme.2013.10.008.

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16

Zarudi, I., L. C. Zhang, and M. V. Swain. "Microstructure evolution in monocrystalline silicon in cyclic microindentations." Journal of Materials Research 18, no. 4 (2003): 758–61. http://dx.doi.org/10.1557/jmr.2003.0104.

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The study presents evidence of the microstructural evolution during cyclic indentation of monocrystalline silicon with a spherical indenter. Transmission electron microscopy examination of microindentation on cross-section view samples showed that the structure change in the transformation zone features a decomposition of the amorphous phase to R8/BC8 crystals. Outside the zone, cyclic loading gives rise to bending of pristine silicon, slip penetration, and radial cracking. The development of the load–displacement curves during consecutive indentations is justified in terms of the phase transf

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17

Houdková, Šárka, František Zahálka, and Michaela Kašparová. "Fracture Toughness of HVOF Sprayed Cermet Coatings Measured by Vickers Indentation." Key Engineering Materials 465 (January 2011): 475–78. http://dx.doi.org/10.4028/www.scientific.net/kem.465.475.

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In the paper, the indentation fracture toughness of the HVOF sprayed WC-12%Co coatings is determined by the Vickers indentation test in dependence on used load. The relations, proposed by Chicot, were used to calculate the value of KIc at condition of the Palmqvist, Intermediate and Radial-median cracking mode. The applicability of using different equations is discussed with respect to the size indentation effect of IFT.

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18

BÖHNE, CHRISTOPH, GERSON MESCHUT, MAX BIEGLER, and MICHAEL RETHMEIER. "The Influence of Electrode Indentation Rate on LME Formation during RSW." Welding Journal 101, no. 7 (2022): 197–207. http://dx.doi.org/10.29391/2022.101.015.

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During resistance spot welding of zinc-coated advanced high-strength steels (AHSSs) for automotive production, liquid metal embrittlement (LME) cracking may occur in the event of a combination of various unfavorable influences. In this study, the interactions of different welding current levels and weld times on the tendency for LME cracking in third-generation AHSSs were investigated. LME manifested itself as high-penetration cracks around the circumference of the spot welds for welding currents closely below the expulsion limit. At the same time, the observed tendency for LME cracking showed

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19

Lo, Wai, A. M. Campbell, Jie Luo, and R. Stevens. "Indentation-induced deformation and microcracking of highly textured superconducting (Bi,Pb)2Sr2Ca2Cu3Ox ceramic." Journal of Materials Research 10, no. 3 (1995): 568–77. http://dx.doi.org/10.1557/jmr.1995.0568.

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A high Tc ceramic superconductor has been prepared having a high degree of preferred orientation, this having been generated by means of a large magnetic field during the early stages of processing. The texture of the material has been characterized using XRD textural analysis and the microstructure by high resolution electron microscopy. Pyramidal indentation (Vickers indent), deformation, and cracking have been investigated using high resolution SEM. Semispherical deformation zones were formed under indents, a result of slipping of adjacent ab/ab (basal) plane grain boundaries and some micro

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20

Hu, Ya Fei, Naoya Tada, and Ichiro Shimizu. "Cracking and Delamination Behavior of Gold Thin Strip Deposited on Polycarbonate Plate under Cyclic and Stepwisely-Increased Trapezoidal Tension." Applied Mechanics and Materials 595 (July 2014): 36–44. http://dx.doi.org/10.4028/www.scientific.net/amm.595.36.

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Cracking and delamination behavior of small rounded-rectangular gold thin films called “strips” with a thickness less than one micrometer was observed under cyclic and stepwisely-increased trapezoidal tensions. Three strips in different directions were deposited on a polycarbonate plate specimen which was subjected to tensile loading. Straight slit and Vickers indentation were introduced as initial defects on each strip and cracking and delamination which were initiated around the defects were observed. In strips with slit, delamination was observed when introducing the slit. It was suggested

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21

Jung, Yeon-Gil, Antonia Pajares, and Brian R. Lawn. "Effect of oxide and nitride films on strength of silicon: A study using controlled small-scale flaws." Journal of Materials Research 19, no. 12 (2004): 3569–75. http://dx.doi.org/10.1557/jmr.2004.0454.

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Strength properties of silicon substrates containing dense oxide and nitride surface films are investigated using nanoindentations to introduce small flaws of predetermined scale. The indentation flaws provide favored sites for failure in subsequent flexure loading, even in the subthreshold region for indentations without visible corner cracking, confirming that microflaws generated within the indentation zone act as effective crack sources in the substrate. Deposition of the oxide films increases the strength while the nitride films diminish it at any given indentation load. The strength shif

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22

Tancret, F., and F. Osterstock. "Indentation behaviour of porous materials: Application to the Vickers indentation cracking of ceramics." Philosophical Magazine 83, no. 1 (2003): 125–36. http://dx.doi.org/10.1080/0141861021000013796.

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23

Panjan, Peter, Aleksandar Miletić, Aljaž Drnovšek, et al. "Cracking Resistance of Selected PVD Hard Coatings." Coatings 14, no. 11 (2024): 1452. http://dx.doi.org/10.3390/coatings14111452.

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In this study, we used the depth-sensing indentation technique to determine the cracking resistance of different PVD hard coatings deposited on tool steel substrates. By comparison, with the load–displacement curves, measured at the sites of carbide inclusion and a tempered martensite matrix in the D2 tool steel substrate surface, we observed different fracture mechanisms on TiAlN hard coating prepared by sputtering. Additional information about the deformation and fracture phenomena was obtained from the SEM images of FIB cross-sections of both types of indents. We found that the main deforma

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24

A Soloukhin, Victor, José C. M. Brokken-Zijp, and Gijsbertus de With. "Subsurface cracking during indentation on hybrid coatings on polycarbonate." Journal of Materials Research 18, no. 2 (2003): 507–14. http://dx.doi.org/10.1557/jmr.2003.0064.

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Subsurface cracking after nano- and Vickers indentation on transparent silica–(meth)acrylate hybrid coatings deposited on a polycarbonate substrate was observed for the first time. It appeared that after initiation at the interface, these cracks propagated toward the surface and in radial directions as the indentation load increased. It was found that, for chemically identical coatings, the thicker the coating, the higher load necessary to initiate these cracks. Subsurface cracks formed during nanoindentation occur at lower loads than the normally observed surface cracks and are accompanied by

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25

Stepniewska, Malwina, Kacper Januchta, Chao Zhou, Ang Qiao, Morten M. Smedskjaer, and Yuanzheng Yue. "Observation of indentation-induced shear bands in a metal−organic framework glass." Proceedings of the National Academy of Sciences 117, no. 19 (2020): 10149–54. http://dx.doi.org/10.1073/pnas.2000916117.

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Metal−organic framework (MOF) glasses are a newly emerged family of melt-quenched glasses. Recently, several intriguing features, such as ultrahigh glass-forming ability and low liquid fragility, have been discovered in a number of zeolitic imidazolate frameworks (ZIFs) that are a subset of MOFs. However, the fracture behavior of ZIF glasses has not been explored. Here we report an observation of both cracking pattern and shear bands induced by indentation in a representative melt-quenched ZIF glass, that is, ZIF-62 glass (ZnIm1.68bIm0.32). The shear banding in the ZIF glass is in strong contr

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26

Rickhey, Felix, Karuppasamy Pandian Marimuthu, Kwangmin Lee, and Hyungyil Lee. "Indentation cracking of monocrystalline silicon considering fracture anisotropy." Theoretical and Applied Fracture Mechanics 100 (April 2019): 128–38. http://dx.doi.org/10.1016/j.tafmec.2019.01.002.

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27

Armstrong, Ronald W., Louis Ferranti, and Naresh N. Thadhani. "Elastic/plastic/cracking indentation behavior of hard materials." International Journal of Refractory Metals and Hard Materials 24, no. 1-2 (2006): 11–16. http://dx.doi.org/10.1016/j.ijrmhm.2005.03.004.

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28

Chen, Zhangwei, Xin Wang, Alan Atkinson, and Nigel Brandon. "Spherical indentation of porous ceramics: Cracking and toughness." Journal of the European Ceramic Society 36, no. 14 (2016): 3473–80. http://dx.doi.org/10.1016/j.jeurceramsoc.2016.05.010.

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29

Bruns, Sebastian, Kurt E. Johanns, Hamad U. R. Rehman, George M. Pharr, and Karsten Durst. "Constitutive modeling of indentation cracking in fused silica." Journal of the American Ceramic Society 100, no. 5 (2017): 1928–40. http://dx.doi.org/10.1111/jace.14734.

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30

Buang, A. P., R. Liu, X. J. Wu, and M. X. Yao. "Cracking analysis of HVOF coatings under Vickers indentation." Journal of Coatings Technology and Research 5, no. 4 (2008): 513–34. http://dx.doi.org/10.1007/s11998-008-9106-8.

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31

Pavón, J., M. Caillate, Emilio Jiménez-Piqué, et al. "Micro-Structural Characterization and Stress-Corrosion Cracking Behavior of a FGM Glass-Based Coating on Ti6Al4V for Biomedical Applications." Materials Science Forum 492-493 (August 2005): 229–34. http://dx.doi.org/10.4028/www.scientific.net/msf.492-493.229.

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Microstructural and stress-corrosion cracking characterization of two glass-based coatings on Ti6Al4V with different SiO2 content (61% and 64% of SiO2) have been investigated in this work. These coatings belong to the SiO2-CaO-MgO-Na2O-K2O-P2O5 system and were obtained using a simple enamelling technique. They will be used as the first layer of the bioactive FGM coating. Microstructural characterization performed in the coatings by SEM shows the separation of the sintered glass particles after acid etching. The XRD integration method shows that the percentage of the crystalline phase (2.4CaO•0

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32

Yonezu, Akio, Takeshi Ogawa, and Mikio Takemoto. "Evaluations of Elasto-Plastic Properties and Fracture Strength Using Indentation Technique." Key Engineering Materials 353-358 (September 2007): 2223–26. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2223.

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Evaluations of elasto-plastic properties and fracture strength were studied utilizing indentation technique. The elasto-plastic properties of nine monolithic metals were estimated using dual indentation method and compared to the properties under tensile loading test. This method could predict stress - strain curve and was found to determine ultimate tensile strength. For brittle coating, fracture strength of diamond -like carbon (DLC) film was estimated by hybrid indentation with acoustic emission (AE), corrosion potential fluctuation (CPF) and finite element method (FEM). AE and CPF data pro

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33

Yamazaki, Yasuhiro, and Katsu Kudo. "Effect of Water Immersion on Interfacial Strength of a Metal/Epoxy Joint." Key Engineering Materials 774 (August 2018): 289–94. http://dx.doi.org/10.4028/www.scientific.net/kem.774.289.

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Metal/resin joints have been widely used for automotive, electrical device and others. The degradation of interfacial strength of the joints through the effects of moisture is one of the important deterioration mechanisms in their structure applications. In this study, the interfacial strength of an aluminum-alloy/epoxy-resin joint was evaluated by the indentation test using of the instrumented indentation machine developed by ourselves. The in-situ observations of delamination cracking were carried out during the indentation test. The interfacial fracture toughness of the joint was evaluated

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34

Zhou, H. B., Yi Wang Bao, Yan Qiu, Lan Chen, Xiu Fang Wang, and Kun Ming Li. "Indentation Fatigue and In Situ Inspection of Damage Evolution for Glass." Advanced Materials Research 177 (December 2010): 451–54. http://dx.doi.org/10.4028/www.scientific.net/amr.177.451.

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Initiation and propagation of Hertz crack in glass was investigated by combining sphere indentation test and optical microscope under a transparent testing platform. Thus, the process of the crack growth in glass and the critical indentation load and contact crack radius could be determined conveniently. Indentation fatigue tests were carried out to understand the contact damage resistance, the fatigue cycle number for cracking increase with decrease of the fatigue load. This simple testing method is demonstrated convenient and available for calculating the surface local strength of glass in s

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35

Claverie-Burgué, V., P. Montmitonnet, K. Inal, et al. "Micro-Indentation of oxidized low carbon steel to evaluate properties of oxides." IOP Conference Series: Materials Science and Engineering 1270, no. 1 (2022): 012106. http://dx.doi.org/10.1088/1757-899x/1270/1/012106.

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During hot rolling process, an oxide scale grows at the surface of steel slabs. To avoid surface defects such as embedded scale at the end of the finishing mill, descaling stands are added in the production line to remove it using high-pressure water jets. Different steel grades show different descaling capacities and final surface qualities, which may depend on composition through oxide and interface toughness. The idea of this study is to measure the latter using micro-indentation to feed thermomechanical models of the descaling process. After indentation, Focused Ion Beam (FIB) is employed

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36

Du, Zhuotong, Rutao Zhao, Chen Gao, Pei Chen, and Kuilong Xu. "Application of instrument indentation test for residual stress characterization of 5083 aluminium alloy." Journal of Physics: Conference Series 2842, no. 1 (2024): 012038. http://dx.doi.org/10.1088/1742-6596/2842/1/012038.

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Abstract An abnormal cracking phenomenon occurred at the corner of a ventilation window on the 5083 aluminum alloy wallboard used in certain transportation equipment. The residual stresses of the wallboard were measured using an instrumented indentation test. Initially, stress loading was applied to the 5083 specimens using a residual stress loading device to verify the effectiveness of the instrument indentation test (IIT) for testing the residual stresses of 5083 aluminum alloy. Subsequently, IIT was conducted under static conditions at the serving site of the equipment, and the working stre

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37

Hussain, F., and A. Ali. "Elastic and Plastic Properties of Soda Lime Glass by Micro-Indentation." Key Engineering Materials 442 (June 2010): 294–300. http://dx.doi.org/10.4028/www.scientific.net/kem.442.294.

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Brittle cracking in a residual impression can be observed during micro indentation testing of brittle materials. The formation of these cracks in the residual impression depends upon the nature of materials, geometry of indenter, testing load, dwell time and depth of penetration. The area adjacent to the cracks may be appearing either as raised up or sunk down at the edges. This plastic residual impression can be used to obtain various elastic and plastic properties of brittle materials such as shear strength, fracture toughness, crack resistance, surface strength, etc. In present work Soda Li

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Kalnaus, Sergiy, Andrew S. Westover, Guang Yang, Mordechai Kornbluth, Erik Herbert, and Nancy Dudney. "Inverted Glasses As Ductile Lithium Ion Conductors for Solid State Batteries." ECS Meeting Abstracts MA2024-01, no. 1 (2024): 118. http://dx.doi.org/10.1149/ma2024-011118mtgabs.

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Inorganic electrolytes for solid state batteries with Li metallic anodes must combine properties such as high ionic conductivity, chemical stability, and resistance to failure due to propagation of Li dendrites. Abundance of experimental evidence suggests that cracking of the solid electrolytes due to pressure exerted by lithium plating into the material defects is the primary source of failure [1]. This is due to inherent brittleness of the ceramic ionic conductors, i.e. their inability to reduce stress by means other than fracture. Unlike ceramics, plastic deformation in glass can be achieve

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39

Liu, Pengfei, Lars R. Jensen, Chengwei Gao, and Morten M. Smedskjaer. "Indentation deformation and cracking behavior of hydrated aluminoborate glasses." Journal of the American Ceramic Society 105, no. 2 (2021): 1039–51. http://dx.doi.org/10.1111/jace.18175.

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40

Januchta, Kacper, Pengfei Liu, Søren R. Hansen, Theany To, and Morten M. Smedskjaer. "Indentation cracking and deformation mechanism of sodium aluminoborosilicate glasses." Journal of the American Ceramic Society 103, no. 3 (2019): 1656–65. http://dx.doi.org/10.1111/jace.16894.

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41

Liang, Kaiming, and Koufen Gu. "Transformation Driving Force for Indentation Cracking in Zirconia Ceramics." Journal of the American Ceramic Society 76, no. 12 (1993): 3144–46. http://dx.doi.org/10.1111/j.1151-2916.1993.tb06620.x.

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42

Burns, S. J., and K. Y. Chia. "Nonlinear Compliance Testing Applied to Indentation Cracking in Ceramics." Journal of the American Ceramic Society 78, no. 9 (1995): 2328–34. http://dx.doi.org/10.1111/j.1151-2916.1995.tb08665.x.

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43

USAMI, Hatsuhiko, Kazuto OHASHI, Shinnya SASAKI, and Junji SUGISHITA. "Cracking Behavior of Fused Silica Glass in Sphere Indentation." JSME International Journal Series A 46, no. 3 (2003): 415–18. http://dx.doi.org/10.1299/jsmea.46.415.

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Armstrong, R. W., A. W. Ruff, and H. Shin. "Elastic, plastic and cracking indentation behavior of silicon crystals." Materials Science and Engineering: A 209, no. 1-2 (1996): 91–96. http://dx.doi.org/10.1016/0921-5093(95)10148-9.

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45

Saarna, Mart, Liina Lind, Priidu Peetsalu, and Fjodor Sergejev. "Cyclic Loading of TiCN Coating by Vickers Indentation." Key Engineering Materials 721 (December 2016): 425–29. http://dx.doi.org/10.4028/www.scientific.net/kem.721.425.

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Physical Vapour Deposited (PVD) coatings are used in wide range of industrial applications where requirements differ. For example, in cutting applications adhesive-abrasive wear along with high contact stresses prevail and PVD coating with thickness of ~2 μm are used. In forming applications adhesive wear usually dominates and relatively thick PVD coatings (~5 μm) are preferred. For both the applications coatings are subjected to cyclic stress and therefore it is a point of interest to learn the behaviour of PVD coatings with different thickness under cyclic loading. Cracking resistance and fa

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46

Armstrong, Ronald W., and Wayne L. Elban. "Dislocation Reaction Mechanism for Enhanced Strain Hardening in Crystal Nano-Indentations." Crystals 10, no. 1 (2019): 9. http://dx.doi.org/10.3390/cryst10010009.

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Stress–strain calculations are presented for nano-indentations made in: (1) an ammonium perchlorate (AP), NH4ClO4, {210} crystal surface; (2) an α-iron (111) crystal surface; (3) a simulated test on an α-iron (100) crystal surface. In each case, the calculation of an exceptionally-enhanced plastic strain hardening, beyond that coming from the significant effect of small dislocation separations in the indentation deformation zone, is attributed to the formation of dislocation reaction obstacles hindering further dislocation movement. For the AP crystal, the exceptionally-high dislocation reacti

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Rzepiejewska-Malyska, K. A., W. M. Mook, M. Parlinska-Wojtan, J. Hejduk, and J. Michler. "In situ scanning electron microscopy indentation studies on multilayer nitride films: Methodology and deformation mechanisms." Journal of Materials Research 24, no. 3 (2009): 1208–21. http://dx.doi.org/10.1557/jmr.2009.0139.

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Systematic studies of the deformation mechanisms of multilayer transition metal nitride coatings TiN/CrN, TiN/NbN, and NbN/CrN, and corresponding reference coatings of TiN, NbN, and CrN deposited by a direct current (dc) magnetron sputtering process onto silicon 〈100〉 have been performed. Mechanical characterization was conducted using a combination of microindentation and nanoindentation in the load range 30 to 150 mN and 0.5 to 3.5 mN, respectively. For both load ranges, scanning electron microscopy (SEM) in situ indentation was used to observe the indentation process including any pileup, s

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AKYOL, Burak, Mustafa GÜDEN, and Subhan NAMAZOV. "EXPERIMENTAL INVESTIGATION OF THE EFFECT OF STRAIN RATE ON THE CRUSHING STRENGTH OF A CELLULAR CONCRETE." Machine Science Journal 1, no. 1 (2023): 4–21. http://dx.doi.org/10.61413/ftxi2310.

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The strain rate dependent compressive strength of an autoclaved aerated concrete (AAC) having a density of 600 kg m-3 was experimentally investigated between quasi-static and high strain rates (2x10-3-~4150 s-1) through quasi-static and dynamic compression, confined compression and indentation tests. High strain rate equilibrium and direct impact non-equilibrium compression tests in conjunction with the high strain rate confined compression and indentation tests were conducted in a compression Split Hopkinson Pressure Bar. The experimental results showed two different regions of the compressiv

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Morris, Dylan J., and Robert F. Cook. "Indentation fracture of low-dielectric constant films: Part II. Indentation fracture mechanics model." Journal of Materials Research 23, no. 9 (2008): 2443–57. http://dx.doi.org/10.1557/jmr.2008.0295.

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Part I [D.J. Morris and R.F. Cook,J. Mater. Res.23,2429 (2008)] of this two-part work explored the instrumented indentation and fracture phenomena of compliant, low-dielectric constant (low-κ) films on silicon substrates. The effect of film thickness and probe acuity on the fracture response, as well as the apparent connection of this response to the perceived elastic modulus, were demonstrated. These results motivate the creation of a fracture model that incorporates all of these variables here in Part II. Indentation wedging is identified as the mechanism that drives radial fracture, and a c

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Zarudi, Irena, and Liang Chi Zhang. "Microcracking in Monocrystalline Silicon due to Indentation and Scratching." Key Engineering Materials 312 (June 2006): 345–50. http://dx.doi.org/10.4028/www.scientific.net/kem.312.345.

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This paper discusses the cracking in monocrystalline silicon induced by microindentation with spherical and Berkovich indenters and scratching. It was found cracks always commenced in a specimen’s subsurface beneath the transformation zone. While using a Berkovich indenter the level of the maximum indentation load, Pmax, to initiate microcracking was lower than the case with a spherical indenter. In both indentation and scratching all microcracks took place at the sites of slip intersection or emanated from the bottom of a transformation zone. The paper also discussed critical loads for microc

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