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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"microindentation"”.
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Scale effects in microindentation of ductile crystals
… Since the size effect associated with microindentation was discovered, many theories about its cause have been proposed. Several of the theories suggest that the source of the indentation size effect is experimental error. Such factors as inaccurate measurement of the contact area, …
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Microindentation for Characterization of Interactions in Liquid Metal Composites
… and anisotropic mechanical properties. Microindentation is a material characterization technique that can be used to study the micron-scale droplet-droplet interactions between the inclusions in these composites. Because most microindentation systems are incapable of producing …
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Characterization of Material’s Elastic-plastic Properties Through Microindentation Testing with a Cylindrical Flat-tip Indenter
… developed based on finite element analysis for microindentation. Software used in modeling is ANSYS14.5 and an axisymmetric model is built. The experimental microindentation is compared with the computer model. By using cylindrical microindentation the elastic-plastic properties of the materials …
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Adaptation Of The Biodent For Spherical Microindentation To Determine Elastic Modulus In Small Rodent Bones
… and the progression of bone-related diseases. Microindentation has become a widely used method for evaluating tissue mechanical properties of bone, as it samples the contributions of microarchitecture and composition. Microindentation using a standard pointed tip inherently introduces both …
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Mechanics of elastomeric copolymers
… in their connections to shape recovery under microindentation testing in experiments and numerical simulations. Numerical simulations imparting the proposed constitutive model were found to be capable of capturing the microindentation behavior of materials including force-displacement capable …
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Creep properties of source rocks using indentation : the role of organic matter on texture and creep rates
… the porous kerogen phase. A comparison of creep microindentation data with triaxial creep tests validates creep indentation as a means to understand, quantify, and predict creep behavior of source rocks that extends beyond the test duration. Creep microindentation, thus, saves experimentation …
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GROWTH AND MECHANICAL DEFORMATION OF ALPHA-LACTOSE MONOCRYSTALS
… alpha-lactose monocrystals were assessed by microindentation (Chapter 3), compressive deformation (Chapter 4) and acoustic emission techniques (Chapter 5). The mechanical properties of crystal faces (Oil) and (110) of both lactose types were quantified by microindentation. The indentation …
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Structural Characterization and Thermoelectric Performance of ZrNiSn Half-Heusler Compound Synthesized by Mechanical Alloying
… Mechanical characterization of the samples by microindentation and depth sensing indentation for hardness and elastic modulus will be discussed.
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Preparation, microstructure and properties of silicon carbide-dysprosia composites
… point, single-edge notched beam test and by the microindentation methods.
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Computational modeling of indentation of materials
… different indentation problems involving the microindentation, nanoindentation and reference point indentation (RPI). The goal of this thesis is to develop better understanding of indentation processes in different materials utilizing numerical methods. Indentation has been used for a long …
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Damage analysis and mechanical response of as-received and heat-treated Nicalon/CAS-II glass-ceramic matrix composites
… with an energy dispersive spectrometer, and microindentation indicated that the changes of damage and failure modes were directly related to the changes of characteristics at the fiber/matreix interface/interphase.
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Bacterial adhesion and detachment from model mineralized biofilms
… is not negligible. Atomic force microscopy (AFM) microindentation was used to study the viscoelasticity of non-mineralized and mineralized hydrogels to increase understanding of how crystallization affects the polymer network’s structure and the mechanical behavior. Elastic moduli of the …
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Mechanical behavior and microstructure of self-assembling oligopeptide gels
… to extend the system to ordinary time scales. A microindentation assay was developed and used to characterize the mechanical properties of gels. Several strategies for enhancing the gels' mechanical properties were tested. Gel microstructure was observed in thin sections of material with …
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An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids
… results to some representative problems in microindentation, and compare them against corresponding results from physical experiments.
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Characterization of swine femoral cortical bone using the reference point indentation technique
… risk of bone fracture. In this study, a novel microindentation technique, the reference point indentation (RPI) technique, is used to assess the mechanical properties of swine femoral cortical bone. This technique uses successive indentation cycles to introduce a unique parameter, the …
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Sources of high temperature degradation of cement-based materials : nanoindentation and microporoelastic analysis
… is the primary experimental focus of this study. Microindentation is used to measure the properties of homogenized cement paste, whereas nanoindentation is used to measure the properties of the various phases which make up cement paste. All experimental methods are performed on cement paste …
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Characterization of mechanical properties of copper covetic wires
… the lowest value was for the CuC9 sample. The microindentation test performed at a 500 Pond load resulted in the CuC3 sample having the highest hardness and the CuC0 and CuC5 samples having the lowest hardness. The tensile test results showed an increase yield stress and ultimate tensile …
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Modeling and control of rapid cure in polydimethylsiloxane (PDMS) for microfluidic device applications
… modeling shrinkage and warpage. A novel heated microindentation setup is designed to monitor curing of thin PDMS films, and experimentally validate the theory. The second part of this thesis presents a model for final PDMS shrinkage and warpage using the gel point. Gelation is spatially and …
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Simulations of deformations and fracture of biological materials
… model the deformation of a cortical bone due to microindentation. Thirdly, we model the fracture of cortical bone under a uniaxial tensile load by using an extended finite element method. Finally, we evaluate how an arrangement of curved mineral lamellae in bone, at a nanoscale, influences bone’s …
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High throughput prototyping and multiscale indentation characterization of metallic alloys
… advances described earlier (i.e., spherical microindentation stress-strain protocols and the framework of 2-point statistics). Second, providing detailed insights on mechanical characterization of hierarchical materials and understanding the underlying length scale effects in each constituent …
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