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Showing 1 to 20 of 258 for “"Nanoindentation"”.
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Nanoindentation Under Dynamic Conditions
Nanoindentation has emerged as a leading technique for the investigation of mechanical properties on small volumes of material. Extensive progress has been made in the last 20 years in refining the nstrumentation of nanoindentation systems and in analysis of the resulting data. Recent development …
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Nanoindentation of Gold Single Crystals
Nanoindentation is an increasingly used tool to investigate the mechanical properties of very small volumes of material. Gold single crystals were chosen as a model system for surface modification studies, because of the electrochemical advantages and the simple structure of the material. …
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Multiscale strength homogenization : application to shale nanoindentation
Shales are one of the most encountered materials in sedimentary basins. Because of their highly heterogeneous nature, their strength prediction for oil and gas exploitation engineering has long time been an enigma. In this thesis, we propose a two-scale non-linear procedure for the homogenization …
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Statistical physics of dislocation nucleation by nanoindentation
… understanding of the onset of plasticity during nanoindentation of crystalline materials involves homogenous dislocation nucleation in the crystal underneath the indenter. Through the use of cutting-edge nanoindentation techniques, this study examines the initiation of plastic deformation in …
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Multi-Scale Nanoindentation For Characterization Of Oil Shales
… of the effects of polishing techniques, scale of nanoindentation, and petrophysical properties were conducted on both Woodford and Tuscaloosa Marine Shale. Polishing procedures include both an in-house developed, mechanical sample preparation protocol as well as ion beam milling. The elastic …
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Characterization of Heterogeneous Material Properties of Aorta Using Nanoindentation
Arterial mechanical properties have received increasing attention in the past few decades due to their vast effect on predicting cardiovascular diseases and injuries. The heterogeneity of thoracic aortic tissue was characterized in terms of viscoelastic material properties and correlations were …
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Instrumented Nanoindentation Studies Of Deformation In Shape Memory Alloys
… the twinned martensite was identified from the nanoindentation response and the elastic modulus of the twinned martensite was estimated to be about 17 GPa. Finite element modeling was used to validate the measurements. For the case of the superelastic NiTi, the elastic modulus of the parent …
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Material invariant properties of shales : nanoindentation and microporoelastic analysis
… sides. Advanced experimental techniques, such as nanoindentation, and theoretical microporomechanics make it possible today to break such a heterogeneous material down to a scale where physical chemistry meets mechanics, to extract intrinsic material properties that do not change from one material …
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Nanoindentation Techniques for the Evaluation of Silicon Nitride Thin Films
… to create 96 samples. Samples were subjected to nanoindentation testing to evaluate the mechanical properties of the film. Samples were subjected to nanoimpact testing to compare the damage resistance of the film to separate nanoimpact types. Samples were subjected to nanoscratch testing to …
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Deposition, crystallization and nanoindentation of substrate-bound biomolecule-assembled nanomaterials
… mechanical testing techniques, then using AFM nanoindentation of various superlattice designs to correlate DNA-NP lattice structure to mechanical behavior. A layer-by-layer deposition strategy was first examined in order to understand how deposition conditions affect the packing density and …
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Nanoindentation characterization of clay minerals and clay-based hybrid bio-geomaterials
… a pioneering nanomechanical testing method, nanoindentation, to probe the elastic and plastic properties at nano/micro scale. Genesis of these nanomechanical properties are analyzed in the light of microstructures, interatomic bonds, mineralogical and chemical composition. A nanoindentation …
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Investigation of mechanical properties of copper and aluminum covetics using nanoindentation
… and aluminum alloy based covetics using the nanoindentation technique. Covetic copper 10200 and aluminum 6061 alloy samples along with standard, commercially available copper 10200, obtained from TMM, were tested. All the samples were as-cast and not heat treated. The copper covetic samples …
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Micro-Scale Characterization of Quartzitic and Carbonate Sand Grains Using Nanoindentation
… this challenge. Experimental studies consist of nanoindentation tests performed on 17 different sands; 7 quartzitic and 10 carbonate sand samples. Mechanical properties of individual sand grains with different mineralogies are determined using nanoindentation. A force is applied by the …
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Effects of Thickness and Indenter Tip Geometry in Nanoindentation of Nickel Films
Nanoindentation has become a widely used technique to measure the mechanical properties of materials. Due to its capability to deform materials in micro- and nano-scale, nanoindentation has found more applications in characterizing the deformation behavior and determining the mechanical properties …
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Optimal Parameter Values for Accurate and Repeatable Nanoindentation of Human Trabecular Bone
<p>Nanoindentation techniques have not been standardized for use on bone tissues, making comparison of bone material properties obtained via nanoindentation across studies difficult and unreliable. This study determined a set of optimal parameter values for thermal drift correction time, dwell …
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An investigation of fatigue in an Fe-based metallic glass by nanoindentation
… Iron-based bulk metallic glass was studied using nanoindentation to examine the effects of fatigue on the onset of plasticity. Experiments were performed on samples in an as received and 0.8Tg 12-hour annealed condition. The nanoindentation testing procedure focused on investigating fatigue of …
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Macro scale physical model of nanoindentation on vertically aligned carbon nanotube forests
Currently the process of nanoindentation is being explored as a reliable means of determining the mechanical properties of carbon nanotubes (CNTs) and the constituent tubes of vertically aligned carbon nanotube (VACNT) forests. Under indentation, each CNT can be modeled as a cantilevered beam …
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Statistical nano-chemo-mechanical assessment of shale by wave dispersive spectroscopy and nanoindentation
… grid WDS technique was coupled with grid nanoindentation experiments as a means to assess the nanochemomechanics of shale rocks. The similar microvolumes probed by both methods ensure a direct relation between the local chemistry and mechanics response of shale materials. The results of …
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
Positionally-sensitive nanoindentation was carried out in the freshly-cleaved nacre found in the shell of the gastropod mollusk Trochus niloticus. Nacre is a hierarchical biocomposite composed of mineral tablets of 95 weight % calcium carbonate (CaCO3) in the aragonite mineral form and a …
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