Academic literature on the topic 'Nanoindentation hardness test'
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Journal articles on the topic "Nanoindentation hardness test"
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Wei, Yueguang, Xuezheng Wang, and Manhong Zhao. "Size effect measurement and characterization in nanoindentation test." Journal of Materials Research 19, no. 1 (January 2004): 208–17. http://dx.doi.org/10.1557/jmr.2004.19.1.208.
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Nanoindentation test at scale of hundreds of nanometers has shown that measured hardness increases strongly with decreasing indent depth, which is frequently referred to as the size effect. Usually, the size effect is displayed in the hardness-depth curves. In this study, the size effect is characterized in both the load–displacement curves and the hardness–depth curves. The experimental measurements were performed for single-crystal copper specimen and for surface-nanocrystallized Al-alloy specimen. Moreover, the size effect was characterized using the dislocation density theory. To investigate effects of some environmental factors, such as the effect of surface roughness and the effect of indenter tip curvature, the specimen surface profile and the indentation imprint profile for single-crystal copper specimen were scanned and measured using the atomic force microscopy technique. Furthermore, the size effect was characterized and analyzed when the effect of the specimen surface roughness was considered.
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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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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 correlated with this ratio. These nanotribological properties highly depend on the films’ nanostructures. The tribological properties of the FCVA-DLC films were also investigated using a ball-on-disk test. The average friction coefficient of DLC films deposited with DC bias voltage was lower than that of DLC films deposited with pulse bias voltage. The friction coefficient calculated from the ball-on-disk test was correlated with the nanoindentation hardness in dry conditions. However, under boundary lubrication conditions, the friction coefficient and specific wear rate had little correlation with nanoindentation hardness, and wear behavior seemed to be influenced by other factors such as adhesion strength between the film and substrate.
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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 nanoindentation for the high temperature storage gold wire has apparent the discontinuity during loading compared to as-received gold wire. The hardness value increased after subjected to high temperature storage. However, the hardness decreased when the storage period is extended. The decreasing in the hardness value may due to the grain size of Au metal which recrystallized after subjected to high temperature storage. The results obtained from nanoindentation is important in assessing the high temperature storage of wire bonding.
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Bruno, L., F. M. Furgiuele, and G. Sciume´. "Mechanical Characterization of a CVD Diamond Coating by Nanoindentation Test." Journal of Engineering Materials and Technology 125, no. 3 (July 1, 2003): 309–14. http://dx.doi.org/10.1115/1.1586937.
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A FEM analysis was carried out to study the mechanical behavior of a hard coating subjected to a nanoindentation test performed with a Berkovich indenter. The nanoindentation test was simulated by FEM code MSC Marc. The case study is a coating of CVD (Chemical Vapor Deposition) diamond. By the simulation it is possible to obtain the load-displacement curve by which Young modulus and hardness may be evaluated. The paper also analyzes the residual stresses developed at the end of the unloading phase and the influence of the strengthening law to determine the hardness and the elastic modulus of the CVD diamond. The analysis has demonstrated, by the comparison with the experimental results, that the numerical model well describes the behavior of the coating of CVD diamond in the nanoindentation test; in addition it was pointed out that the choice of the hardening law is a crucial aspect in the simulation.
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Ovsik, Martin, David Manas, Miroslav Manas, Michal Stanek, Adam Skrobak, and Petr Kratky. "Ionizing Radiation Effect of PBT Measured by Nano-Indentation Test." Applied Mechanics and Materials 752-753 (April 2015): 317–21. http://dx.doi.org/10.4028/www.scientific.net/amm.752-753.317.
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The paper presents an experimental study of the effect of beta radiation on nanomechanical properties of surface layer of PBT. Irradiation of polymers initiates cross-linking process in the structure especially in nanolayers. Applied radiation doses (66, 132 and 198 kGy) caused different nanomechanical changes which have a significant effect on the final properties of the tested PBT. Beta irradiation of the examined thermoplastic caused the growth of values of material parameters as nanoindentation hardness, nanoindentation modulus or deformation work. The improvement of nanomechanical properties was measured by the nanoindentation test.
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Yao, Wu, and Kang Liang. "Nanoindentation Size Effects for Calcium Silicate Hydrate." Advanced Materials Research 177 (December 2010): 537–40. http://dx.doi.org/10.4028/www.scientific.net/amr.177.537.
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Hardness of Calcium Silicate Hydrate (CSH) at different ages was measured by nanoindentation test. The results show obvious indentation size effect in hardness of CSH. Hardness decreases with increasing depth. Moreover, both low density CSH and high density CSH follow the same size effect law in hardness. This phenomenon further indicates that two types of CSH are of the same basic composition but different packing densities.
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Liu, Qiang, Ying Xue Yao, and L. Zhou. "Research on the Relationship between Indenter Tip Radius and Hardness with a Self-Designed Nanohardness Test Device." Key Engineering Materials 392-394 (October 2008): 267–70. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.267.
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Nanoindentation device has the ability to make the load-displacement measurement with sub-nanometer indentation depth sensitivity, and the nanohardness of the material can be achieved by the load-displacement curve. Aiming at the influence law of indenter tip radius to indentation hardness, testing on the hardness of single-crystal silicon were carried out with the new self-designed nanohardness test device based on nanoindentation technique. Two kinds of Berkovich indenter with radius 40nm and 60nm separately were used in this experiment. According to the load-depth curve, the hardness of single-crystal silicon was achieved by Oliver-Pharr method. Experimental results are presented which show that indenter tip radius do influence the hardness, the hardness value increases and the indentation size effect (ISE) becomes obvious with the increasing of tip radius under same indentation depth.
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Zhang, Tong-Yi, and Wei-Hua Xu. "Surface Effects on Nanoindentation." Journal of Materials Research 17, no. 7 (July 2002): 1715–20. http://dx.doi.org/10.1557/jmr.2002.0254.
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In this paper, we report on a study of the surface effect on nanoindentation and introduce the apparent surface stress that represents the energy dissipated per unit area of a solid surface in a nanoindentation test. The work done by an applied indentation load contains both bulk and surface work. Surface work, which is related to the apparent surface stress and the size and geometry of an indenter tip, is necessary in the deformation of a solid surface. Good agreement is found between theoretical first-order approximations and empirical data on depth-dependent hardness, indicating that the apparent surface stress plays an important role in depth-dependent hardness. In addition, we introduce a critical indentation depth. The surface deformation predominates if the indentation depth is shallower than the critical depth, while the bulk deformation predominates when the indentation depth is deeper than the critical depth.
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Hur, Shin, Sung In Hong, and Dong Kil Shin. "Mechanical Properties of Photosensitive Polyimide Film by Nanoindentation and Microtensile Test." Key Engineering Materials 297-300 (November 2005): 237–43. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.237.
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A free-standing photosensitive polyimide film with thickness of 10µm is fabricated with the different curing temperatures using a micro fabrication process. The microtensile specimens of a strip type are made to facilitate a tensile testing. The Young’s modulus and yield strength of photosensitive polyimide film are measured with various strain rates from 10-4 /s to 10-3 /s by using a microtensile test. Also, the hardness and Young’s modulus of polyimide films are obtained from nanoindentation test. Finally, the mechanical properties measured from microtensile test are compared with those from nanoindentation test.
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Lei, Man, Fa-Ning Dang, Hai-Bin Xue, Zhang Yu, and Ming-Ming He. "Study on mechanical properties of granite minerals based on nanoindentation test technology." Thermal Science 25, no. 6 Part B (2021): 4457–63. http://dx.doi.org/10.2298/tsci2106457l.
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In this paper, the nanoscale mechanical properties of quartz, feldspar, and mica in granite are studied by the nanoindentation technique. Firstly, the surface morphol?ogy of each mineral composition in granite is obtained by a SEM. Secondly, the elastic modulus and hardness of three minerals in granite are calculated through the load-displacement curve obtained by the nanoindentation test. Based on the energy analysis method, the nanometer fracture toughness of three minerals in granite is obtained. Finally, the correlation between the elastic modulus, the hard?ness, and the fracture toughness are obtained by experimental data.
Dissertations / Theses on the topic "Nanoindentation hardness test"
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Dai, Tao Dai. "Effect of Postweld Heat Treatment on the Properties of Steel Clad with Alloy 625 for Petrochemical Applications." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523572474171801.
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Pepe, Valentina. "Development of procedures to perform nanoindentation tests on different bone structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17571/.
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Negli ultimi anni, la nanoindentazione è emersa come potente tecnica per indagare le proprietà micromeccaniche dell'osso. L'indentazione consiste nel premere una punta rigida con una forza nota in un semispazio semi-infinito e nel misurare direttamente o indirettamente l'area di contatto. L'obiettivo principale di questo lavoro è stato quello di sviluppare una procedura per eseguire test di nanoindentazione al fine di studiare le proprietà elastiche e inelastiche di diverse strutture ossee. Dalle misure di nanoindentazione sono stati ricavati i valori di reduced modulus, hardness, indentation modulus ed elastic modulus. L'idea era di eseguire test di nanoindentazione sia per applicazioni precliniche che cliniche e per questo motivo, i tests sono stati effettuati sia su ossa di topo che su ossa umane affette da una particolare condizione patologica, chiamata Osteogenesi Imperfetta. È la prima volta che questi tests vengono eseguiti su tibie di topo, nello specifico su fette di quattro tibie di due ceppi (C57B1/6 e Balb/C), sia su osso corticale che trabecolare. Abbiamo trovato che il modulo elastico varia tra 16.50 ± 7.10 GPa (C57B1/6, osso trabecolare) e 25.08 ± 5.21 GPa (Balb/C, osso corticale). L’hardness varia tra 0.62 ± 0.27 GPa (C57B1/6, osso trabecolare) e 0.96 ± 0.20 GPa (Balb/C, osso corticale). Le nanoindentazioni sul campione di OI (proveniente dall’arto superiore) sono state condotte su diverse fette, per analizzare le potenziali differenze tra le due regioni e le quattro sezioni. Abbiamo trovato un modulo elastico di 12.14 ± 5.79 GPa e l’hardness di 0.49 ± 0.21 GPa. In conclusione, abbiamo sviluppato questo nuovo protocollo che può essere applicato a diversi lavori futuri. Ad esempio, per le applicazioni precliniche aumentando il numero di topi diversi o per applicazioni cliniche aumentando il numero dei campioni di OI, raccogliendo campioni con diversi tipi di OI, indagando l'effetto dei trattamenti o confrontando le ossa di OI con osso sano.
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Kuguimiya, Rosiane Nogueira. "Influência das unidades fotoativadoras e do material restaurador indireto sobre a dureza de um cimento resinoso dual auto-adesivo e um cimento resinoso dual convencional por meio de teste de nanoendentação." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/23/23134/tde-21022014-141920/.
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O objetivo deste estudo foi avaliar a dureza de um cimento resinoso dual autoadesivo (RelyX U200) e um cimento resinoso dual convencional (RelyX ARC) fotoativados sob materiais restauradores indiretos, utilizando unidades fotoativadoras com diferentes comprimentos de ondas (LED Elipar Freelight 2, LED Bluephase, Laser AccuCure 3000TM), por meio de teste de nanoendentação. Para a obtenção dos espécimes foram utilizados incisivos bovinos que após profilaxia, foram submetidos a cortes no limite amelo-cementário para a separação da porção coronária. Após inclusão, os espécimes foram submetidos ao desgaste para exposição de dentina e padronização do substrato. Para simular clinicamente restaurações indiretas foram confeccionadas peças em cerâmica IPS e.max® Press (Ivoclar Vivadent) e em resina composta indireta SR Adoro (Ivoclar Vivadent) que foram cimentadas nas superfícies dentinárias. Os espécimes foram seccionados longitudinalmente em baixa velocidade e constante irrigação e polidos em politriz. Foi estabelecido um grupo controle positivo, no qual o cimento foi fotoativado sem a interposição de material restaurador indireto e um grupo controle negativo, no qual, após a cimentação do material restaurador indireto, a fotoativação foi suprimida, ocorrendo apenas a polimerização química do cimento. Todos os espécimes foram armazenados em água destilada a 37°C durante 7 dias e após esse período, foram submetidos ao teste de nanoendentação na linha de cimentação, com o auxílo do ultra-microdurômetro (Shimadzu Dynamic Ultra Micro Hardness Tester). O ciclo aplicado foi de 100mN. Foram realizadas cinco nanoendentações em cada espécime, cujas médias resultaram nos valores de cada superfície. Os resultados obtidos foram submetidos à Análise de Variância e Teste de Tukey (p<0,05). Podese concluir que o cimento RelyX ARC apresentou maiores valores de dureza do que o RelyX U200 e este foi mais dependente da fotoativação para alcançar uma polimerização adequada. A dureza dos cimentos resinosos avaliados foi influenciada negativamente pela interposição do material restaurador indireto e apenas os LEDs foram capazes de manter o mesmo grau de polimerização dos cimentos quando interposto um material restaurador indireto.This study aimed to evaluate the hardness of a dual cure self-adhesive resin cement (RelyX U200) and a dual cure conventional resin cement (RelyX ARC) light curing units with different wavelengths (Elipar Freelight 2 LED, Bluephase LED, AccuCure 3000TM Laser) through nanoindentadion test. To obtain the specimens bovine incisors were used after prophylaxis. The tooth were sectioned at the limit amelocement for the separation of the coronal portion. After inclusion, the dentin surface of the specimens were exposed to standardize the substrate. To clinically simulate indirect restorations ceramic pieces were made (IPS e.max® Press/Ivoclar Vivadent) and indirect composite resin (SR Adoro/Ivoclar Vivadent) were cemented on dentin surfaces. The specimens were sectioned longitudinally at low speed with constant irrigation and polished. A positive control group was stablished, in which the cement was light cured without the interposition of indirect restorative material, and a negative control group, in which, after cementation of the indirect restorative material, the light curing was removed, occurring only the chemical polymerization of the cement. All specimens were stored in distilled water at 37°C for 7 days. Nanoindentadion hardness of the cement layer was measured under 100mN load (Shimadzu Dynamic Ultra Micro Hardness Tester). Five nanoindentations in each specimen were obtained, which resulted in the average values of each surface. Data were statistically analyzed using ANOVA and Tukey test (p<0,05). RelyX ARC pesented higher values of hardness than RelyX U200 and this was more dependent on the polymerization. The hardness of the evaluated resin cements was negatively influenced by the interposition of an indirect restorative material and only the LEDs were able to maintain the same degree of polymerization of the cement when an indirect restorative material was used.
Conference papers on the topic "Nanoindentation hardness test"
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Leigh, S. H., C. C. Berndt, M. K. Ferber, and L. Riester. "Nanoindentation Study of Thermal Spray Deposits." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0723.
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Abstract The nanoindentation technique has been applied to thermal-sprayed metal, cermet and ceramic deposits. The hardness and elastic modulus were determined from the load-displacement curves. Each test was implemented by varying the penetration depth (100, 200, 300 and 400 nm) in the same test location and at least 20 tests were performed. The results were compared to those from microindentation tests. The nanoindentation test, essentially, measured the submicrometer scale properties of thermal spray deposits, which can be considered as "near-intrinsic" properties of the coatings. Thus, these measurements exclude most of the microstructural factors that influence the "macroscale" properties. The nanoindentation test exhibits significantly greater hardness and elastic modulus values than the microindentation test.
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Liu, Meidan, Junfeng Nie, and Pandong Lin. "Nanoindentation Test of F321 Austenitic Stainless Steel Under Fe-ion Irradiation." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-63353.
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Abstract Nuclear technology, as a high quality, clean and reliable energy supply, is attracting broad interest from countries across the world. F321 austenitic stainless steel (F321SS) is widely utilized in key components of nuclear power plant due to its excellent corrosion resistance and high temperature mechanical properties. Irradiation can easily lead to the degradation behaviors of materials, such as irradiation hardening, irradiation embrittlement and high-temperature He embrittlement, etc. Understanding such degradation is important for predicting the evolution of material behavior under irradiation and extending the lifespan of existing nuclear reactors. Ion irradiation is most commonly used to model neutron-induced damage since the irradiation conditions (temperature, flux, spectrum, etc.) can be regulated more accurately and flexibly. In this paper, the Fe-ion irradiation experiments of F321SS at different temperatures and doses were carried out, and the nanoindentation experiments under different conditions were further conducted. Irradiation hardening is observed in all specimens and strongly depending on irradiation temperature and damage dose. The hardness after irradiating increases with doses and saturates for at least 1dpa under low temperature regimes (< 300°C). However, at higher temperature (450°C and 560°C), nano-hardness reaches the peak at ∼0.5dpa and then declines. Moreover, the hardness of all specimens has a similar trend with temperature, that is, it first increases, reaches the peak, and then decreases.
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Ahmed, Mesbah U., and Rafiqul A. Tarefder. "Substrate Effect on Modulus of Elasticity and Hardness of Thin Film Under Nanoindentation Test." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89497.
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Mechanical properties of thin film under nanoindentation test by Finite Element Analysis (FEA) have been studied in this literature. An axi-symmetric bi-layer model has been developed in commercial finite element analysis software, ABAQUS. Aluminum (Al) comprises the thin film whereas Silicon (Si) comprises the substrate. This model has been simulated using the loading condition that mimics real nanoindentation test, i.e. an indenter has been probed to a predefined depth onto Al-thin film. Modulus of elasticity and hardness of thin film have been calculated by existing empirical relationship. Substrate effect on determination of film modulus and hardness has been investigated by varying the substrate modulus. It has been observed that substrate effect is pronounced on film modulus determination whereas hardness is not significantly sensitive to this effect. Depth of indentation has also been varied over a long range to observe the indentation effect on these parameters. It is obvious that film modulus is increased with depth increment. However, hardness variation is not regular. Different friction condition is also in the scope of this study. It has been observed that friction does not affect modulus of elasticity. It, however, affects hardness of thin film. This is attributed to the dissipation of the energy needed to overcome friction at film-indenter interface.
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Al-Haik, Marwan, Shane Trinkle, Hartono Sumali, Daniel Garcia, Fan Yang, Ulises Martinez, and Scott Miltenberger. "Investigation of the Nanomechanical and Tribological Properties of Tooth-Fillings Materials." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42975.
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This study utilizes novel characterization techniques nanoindentation and nanoscratch for testing both the human enamel and dentine together with two biocompatible dental filling materials; epoxy nanocomposite and silver amalgam. Nanoindentation tests were performed to obtain accurate hardness and reduced modulus values for the enamel, dentin and two different fillers. We utilized Nano-scratch tests to obtain critical load in scratch test and resistance to sliding wear. Testing showed the silver amalgam filling has a higher modulus of elasticity, hardness and wear resistance compared to the nanocomposite. The novel mechanical characterization techniques utilized might assist in better understanding the mechanical behavior of the dental fillers and thus facilitate the design of robust fillers with excellent mechanical properties.
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Ahsan, Sanjida, Md Tahmidur Rahman, and Rafiqul A. Tarefder. "Effects of Material Property and Geometry in Nanoindentation Simulation of Thin Film Mechanical Characterization." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66608.
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Nanoindentation of thin film-thick substrate system is a commonly employed tool to measure the mechanical properties of materials. Finite Element Method (FEM) simulation of nanoindentation experiment can overcome the expense and limitations of sophisticated test procedure. This study focused on the FEM simulation of nanoindentation test in ABAQUS environment to check the effects of film-substrate material properties and geometry. The indentation process in concern involves a two dimensional axisymmetric model where a thin film is placed above a substrate and indented by a rigid indenter for a specific friction condition. Modulus of elasticity and hardness of thin film has been calculated from analysis results using empirical relationship. For this study, two types of thin film properties i.e. elastic-perfectly plastic and elasto-plastic with specific strain hardening condition are taken for consideration. Firstly, different elastic substrate materials have been used under elastic-perfectly plastic thin film to observe the substrate strength effects. The analysis has been conducted for four different indentation depths to incorporate the influence of depth of penetration also. Secondly, similar analysis was performed for strain-hardening film material for all substrate strength to compare the behavior with perfectly plastic case. Finally, thickness of substrate layer has also been varied to observe the effect of substrate thickness under nanoindentation test. The simulation result shows that substrate strength effect is pronounced on film modulus determination whereas hardness is not significantly sensitive to this effect. Substrate modulus with magnitude smaller or near film modulus can predict reasonable value of film modulus whereas high strength substrate modulus i.e. rigid body as a substrate produces extremely high film modulus. Indentation derived film hardness affects significantly the elastic modulus due to incorporation of strain hardening in thin film properties. In addition, calculated film properties increase with the increment of indentation depth but show negligible change due to the variation of substrate thickness.
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Fahim, Abdullah, S. M. Kamrul Hasan, Jeffrey C. Suhling, and Pradeep Lall. "Nanoindentation Testing of SAC305 Solder Joints Subjected to Thermal Cycling Loading." In ASME 2019 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ipack2019-6471.
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Abstract Solder joints in electronic packages are frequently exposed to thermal cycling environment. Such exposures can occur in real life application as well as in accelerated thermal cycling tests used for the fatigue behavior characterization. Because of temperature variations and CTE mismatches of the assembly materials, cyclic temperature leads to damage accumulation and material property evolution in the solder joints. This eventually results in crack initiation, and subsequent crack growth and failure. In this study, the nanoindentation technique was used to understand the evolution of mechanical properties (modulus, hardness and creep behavior) of SAC305 BGA solder joints and Cu pad subjected to thermal cycling loading for various durations. In addition, microstructural changes in those joints that occur during thermal cycling were observed using both SEM and optical microscopy. BGA solder joint strip specimens were first prepared by cross sectioning BGA assemblies followed by surface polishing to facilitate SEM imaging and nanoindentation testing. The strip specimens were chosen to contain several single grain solder joints. This enabled large regions of solder material with equivalent mechanical behavior, which could then be indented several times after various durations of cycling. After preparation, the solder joint strip samples were thermally cycled from T = −40 to 125 °C in an environmental chamber. At various points in the cycling (e.g. after 0, 50, 100, and 250 cycles), the package was taken out from the chamber, and nanoindentation was performed on each single grain joint and joint Cu pads to obtain the modulus, hardness, and creep behavior at 25 °C. This allowed the evolution of the mechanical properties with the duration of thermal cycling to be determined. Moreover, microstructural changes were also observed after various durations of cycling using optical microscopy. From the nanoindentation test results, it was found that the modulus and hardness of the SAC305 solder joints dropped significantly with thermal cycling. However, the Cu pad did not show any change in the mechanical behavior during cycling. Moreover, the nanoindentation creep test results showed significant increases in the creep deformation for solder joints whereas Cu pad did now show any significant changes in creep behavior when both of them were subjected to thermal cycling up to 250 cycles.
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Bec, S., K. Demmou, and J. L. Loubet. "Mechanical Properties of ZDTP Tribofilms Measured by Nanoindentation: Strain Rate and Temperature Effects." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71145.
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This study aims to contribute to better understand the antiwear action of zinc dialkyldithiophosphate (ZDTP) additives used in car engine lubrication. The antiwear action of ZDTP is associated to the formation of a protective tribofilm onto the rubbing surface. On a mechanical point of view, the efficiency of ZDTP tribofilms results from equilibrium between film formation and wear rates, associated with appropriate rheological properties. In this work, the mechanical properties of a ZDTP tribofilm have been measured by nanoindentation in different test conditions in order to investigate the effect of temperature and strain rate. A Nanoindenter XP® entirely set into a climatic chamber was used to perform the nanoindentation tests. For all tests, an increase of the elastic modulus was observed from a threshold contact pressure value. This effect is similar to the anvil effect observed on polymers: in confined geometry, the elastic modulus increases versus hydrostatic pressure. For the tribofilm, in the studied range, this effect is enhanced at high temperature and low strain rate. Furthermore, when the temperature increases, a change in the rheological behavior of the tribofilm is observed. Up to about 50°C, the tribofilm exhibits viscoplastic behavior — the hardness increases versus strain rate — and above 50°C, the hardness decreases versus strain rate (“shear thinning-like” behavior).
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Wang, Hao, Evgeny L. Gurevich, and Andreas Ostendorf. "Application of nanoindentation technique to test surface hardness and residual stress of NiTi alloy after femtosecond laser shock peening." In High-Power Laser Materials Processing: Applications, Diagnostics, and Systems X, edited by Stefan Kaierle and Stefan W. Heinemann. SPIE, 2021. http://dx.doi.org/10.1117/12.2593092.
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Shibutani, Tadahiro, Qiang Yu, and Masaki Shiratori. "Evaluation of Creep Properties in Soldering Ball by Nanoindentation Creep." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80160.
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In this paper, the behavior the behavior of creep deformation in low melting point alloy during a nanoindentation test was examined. Nanoindentation creep test was performed for eutectic tin-lead solder ball. Estimated creep exponent from the relationship between hardness and indenter dwell-time decreases as a function of time. The morphology of indented area shows that the transition from the deformation due to the tip in the early stage to another one in the last stage. Each grain near the indenter tip was transformed in the last stage. Stress analysis using a finite element method reveals that relaxation of equivalent stress progresses rapidly and the residual hydrostatic stress is dominant. Then, the gradient of the residual hydrostatic stress affects the chemical potential on grain boundaries and diffusion creep is activated. Therefore, the transition from the power-law creep to diffusion creep takes place during the nanoindentaion creep.
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Tillmann, W., U. Selvadurai, and W. Luo. "Measurement of the Young’s Modulus of Thermal Spray Coatings by Means of Several Methods." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald, and F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0580.
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Abstract Thermally sprayed coatings are usually defined by their hardness, porosity, roughness and wear resistance. Even though the Young’s modulus is an essential property, which describes the mechanical behavior of the coated components during their use, only few efforts were made to determine this property. The most common measurement methods of the Young’s modulus of thermally sprayed coatings are tensile tests, bending tests, and nanoindentations. During the tensile and bending tests a sliding of the splats can occur due to the laminar structure of the thermally sprayed coatings, influencing the measurement value. When using the nanoindentation test, only the elastic behavior of a single splat can be determined because of a minimal measuring volume. However, the Young’s Modulus of thermally sprayed coatings can also be determined by means of a resonant method, called impulse excitation technique (IET). In this paper, the values of the Young’s moduli of thermally sprayed coatings, measured by several methods are compared with each other and correlated to the microstructure of the coatings, investigated by means of scanning electron microscopy.