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Showing 1 to 20 of 357 for “"Indentation"”.
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Indentation of plastically graded materials
… strain hardening exponent on frictionless normal indentation. To date, however, systematic studies of plasticity gradient effects on indentation response have not been completed. A comprehensive parametric study of the mechanics of indentation of plastically graded materials is completed in this …
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Spherical indentation of magnetostrictive materials
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Indentation induced deformation in metallic materials.
Nanoindentation has brought in many features of research over the past decade. This novel technique is capable of producing insights into the small ranges of deformation. This special point has brought a lot of focus in understanding the deformation behavior under the indenter. Nickel, iron, …
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Computational modeling of indentation of materials
… on computational modeling of several 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. …
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Indentation and nanomechanics of graphene-substrate interfaces
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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Computational and experimental study of instrumented indentation
… by recourse to instrumented micro- and/or nanoindentation. This technique is capable of extracting mechanical properties accurately down to nanometers, via rigorous interpretation of indentation response. Such interpretation requires fundamental understandings of contact mechanics and …
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Indentation analysis and mechanical modeling of multilayered composites
… element modeling was employed to analyze the nanoindentation and microcompression behavior. This modeling study treats the heterogeneous structure of the material explicitly, and seeks to correlate the overall material response with the intrinsic deformation characteristics. We first report on the …
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Indentation Behavior of Multilayer Al/SiC Thin Films
Nanoindentation is useful for evaluating the mechanical properties, such as hardness and Youngs modulus, of bulk and thin film materials. Multilayer thin films are an important subset of materials in which alternating layers of two or more materials are deposited on a substrate. Fabrication of …
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Localization of deformation in thin shells under indentation
… in thin spherical elastic shells under indentation. Past a critical indentation, the deformation of the shell ceases to be axisymmetric and sharp points of localized curvature form. In plates, these sharp points are known as d-cones. By way of analogy, regions of localization in shells …
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Simplified theory for contact indentation of sandwich panels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Simulations of Indentation at Continuum and Atomic levels
… isotropic and cubic materials through indentation tests on thin layers bonded to rigid substrates. Accordingly, we first use the Stroh formalism to provide an analytical solution for generalized plane strain deformations of a linear elastic anisotropic layer bonded to a rigid substrate, …
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Extraction of Superelastic Parameter Values from Instrumented Indentation Data
… of parameter values in a constitutive law) via indentation testing. Specimens can then be small, require minimal preparation and be obtainable from components in service. Interrogation of small volumes also allows mapping of properties over a surface. On the other hand, the tested volume must be …
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High throughput prototyping and multiscale indentation characterization of metallic alloys
… compression, micro- bending, and nanoindentation. Among these, spherical nanoindentation is the most efficient and most reliable one. This high throughput mechanical protocol is capable of capturing local mechanical responses at different length scales in polycrystalline metals in the …
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Effects of swelling on brain tissue mechanical properties by indentation
… of study with atomic force microscopy and nanoindentation. Here, the method of nanoindentation is applied to brain tissue slices to identify the effects of swelling on the tissue’s mechanical properties. The stiffness and relaxation properties of brain tissue slices are identified, suggesting a …
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Extraction of Inelastic Mecahnical Properties of Metals from Indentation Data
… finite element method (FEM) modelling of the indentation procedure, aimed at obtaining well defined mechanical properties of metals solely from experimental indentation data. Relatively large (1 2 mm radius) spherical indenters have been used which offer a number of advantages. The material …
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Development of novel dynamic indentation techniques for soft tissue applications
… behavior of soft tissues are dominated by indentation techniques. The major challenge for this testing configuration is in finding a unique solution to the "inverse problem" i.e., obtaining material properties that are uniquely defined by the indentation force-displacement response. Much of …
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Mechanical response of polymer matrix composites using indentation stress-strain protocols
… To address this need, the use of instrumented indentation on a lengthscale appropriate to the material system presents itself as a viable solution. Indentation is uniquely suited to such an implementation due to its inherent ability to conform to the lengthscale of testing needed and its high …
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Indentation Protection of Lithium-Ion Batteries Using Woven Fiber Metal Laminates
… cells were subjected to destructive quasi-static indentation using a V-shaped stainless steel wedge indenter at different loading orientations, directions, and rates. The modules were discharged to a very low state of charge prior to testing. Force and voltage were measured as a function of …
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Methodology to determine post yield material mechanical properties from spherical indentation
… material stress-strain curve based on spherical indentation is studied. Spherical-indentation process is analyzed by finite element (FE) method and a systematic analysis of relationships between indentation parameters and true stress/plastic-strain (sigmat- epsilonp) curve is performed for a …
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Evaluation of foam concrete physical properties and mechanical response under indentation
Lightweight foam concrete is a widely accepted construction material with a controllable low strength. Conventional use of this material is often seen in applications such as excavatable landfilling or thermal isolation. Different from solid material, this cellularized cementitious foam tends to …
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