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Showing 1 to 20 of 138 for “"elastic moduli"”.
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Multiscale modeling of elastic moduli and strength of bone
… studied mechanical properties of bone include elastic moduli and ultimate strength. In the first part of the current study, multiscale modeling approaches are proposed to predict the elastic stiffness constants of bone. The structure and properties of cortical and trabecular bones are analyzed …
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The effects of fluid pressure changes on fractured rock elastic moduli and surface deformation
Reservoir models use the elastic moduli of rock, both bulk and shear, to compute deformation. These moduli may change with pressure and fracture density, but this effect is usually left out of models. This work shows effective elastic moduli of fluid-filled fractured rock through a self consistent …
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Recovering elastic moduli of nonlinear anisotropic annular membranes from interior measurements of deformation and pressure
We investigate the problem of inferring elastic moduli of nonlinearly elastic membranes from interior measurements of deformation and pressure. We begin by formulating a model of membrane deformation under a vertical force where the geometry of the membrane is star-like. The model makes no …
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Computational Analysis of Elastic Moduli of Covalently Functionalized Carbon Nanomaterials, Infinitesimal Elastostatic Deformations of Doubly Curved Laminated Shells, and Curing of Laminates
… effects of covalent functionalization on elastic moduli of these nanomaterials. It is found that Young's modulus and the shear modulus of an SWCNT (SLGS), respectively, decrease by about 34% (73%) and 43% (42%) when 20% (10%) of carbon atoms are functionalized for each of the four …
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Evaluation of reaction kinetics and material properties of cementitious ceramic materials using ultrasonic velocity and attenuation measurements
… content in the range of 0 - 60 wt 0/0. The elastic properties of the material were determined from ultrasonic velocity measurements and were found to be dependent upon the filler volume fraction. The measured elastic moduli were found to Increase as porosity decreased, and this effect might …
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Swelling properties of hydrogel coatings on neural devices
… formulations were fabricated and produced elastic moduli ranging from 13kPa to 687 kPa, which lie within two orders of magnitude of the elastic moduli of the brain (6kPa). Dehydration of the hydrogels provides the mechanical rigidity necessary for implantation into the brain. The …
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Seismic Performance of Self-Consolidating Concrete Bridge Columns
… 15, and 10 percent higher, and the measured SCC elastic moduli were 13, 17 and 14 percent lower. Additionally, SCC elastic moduli were 11, 7, and 9 percent lower than calculated concrete elastic moduli using ACI equations. The experimental evaluation of reinforced concrete bridge columns …
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Bacterial adhesion and detachment from model mineralized biofilms
… been to create an agarose hydrogel with similar elastic moduli to real biofilms in order to perform systematic studies of calcium carbonate precipitation within the gel. Agarose is a polymer made of chains of alternating galactose and anhydrous galactose, whose elastic modulus can be tuned by …
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Tensile Properties of Single Vaginal Smooth Muscle Cells
… smooth muscle cells (SMCs) to quantify their elastic moduli. Cells were enzymatically isolated from vaginal walls of freshly sacrificed, virgin Long Evans rats and cultured using well-established methods. A custom-built experimental setup was used to perform tensile tests. Micropipettes were …
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Elastic properties and fracture behavior of graphite/polyimide composites at extreme temperatures
… of elevated and cryogenic temperatures on the elastic moduli and fracture strengths of several Celion-6000/PMR-15 laminates was measured. Tests were run at -157,24 (room temperature), and 316°C (-250, 75, and 600°F). Both unnotched and notched laminates were tested. Several failure criteria, …
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Tensile behavior of aluminum reinforced with angle-ply boron epoxy laminates
… than the corresponding all composite laminates. Elastic moduli and Poisson ratios agreed quite well with predicted values but strength predictions were inconsistent.
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The dynamic properties of concentrated charge stabilized suspensions
… ranged from 0.10-0.62 are examined. Equilibrium elastic moduli and osmotic pressures are characterized. Rheological and osmotic pressure determinations of the location of the order/disorder phase transition are found to agree. Yielding and catastrophic shear thinning where the suspension …
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Design and construction of a motor-actuated sea ice compression testing machine
… the thesis provided a detailed analysis of the elastic moduli of sea ice. Despite the machine's slight deformation under load, the results indicated elastic moduli within the literature-reported range for sea ice. This data is crucial for understanding sea ice's elastic properties under varying …
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Refined Evaluation of Effective Prestress in the Varina-Enon Bridge
… used in previous studies. Results using two elastic moduli for concrete are compared for each method of live load moment calculation. Finally, back-calculated effective prestress values are compared against effective prestress from the finite element model. Depending on the method used for …
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Laboratory Ultrasonic Pulse Velocity Logging for Determination of Elastic Properties from Rock Core
… density data to calculate acoustic estimates of elastic moduli. However, logistical concerns arise since the approach must be conducted at the advancing tunnel face. As a result, borehole mechanical property analyses are rarely used. Within this context, laboratory ultrasonic pulse velocity …
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STRESS AND FREQUENCY DEPENDENT PROPERTIES OF POROELASTIC ANISOTROPIC ROCK
The poroelastic response of fluid saturated porous rock due to stress variations is of interest in geophysics and geomechanics as it has practical applications in reservoir depletion, fluid injection, time-lapse monitoring, and carbon dioxide sequestration. The effective stress in a poroelastic …
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Molecular Dynamics and Mechanical Behavior of Collagen Type I and its Lysine/Hydroxylysine-derived Crosslinks
… differences were observed for the high-strain elastic moduli of our microfibril unit models, namely and in increasing order, uncrosslinked, immature crosslinked (HLKNL and deH-HLNL), mature HHL-crosslinked, and mature PYD-crosslinked. At the fibril level, our low- and high-strain elastic moduli …
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Nondestructive evaluation of composite rods using ultrasonic wave propagation
… ultrasonic NDE. In anticipation of the high elastic moduli of the rods (relative to many metals) along their longitudinal axes, a one-dimensional wave propagation analysis will be conducted. By analyzing the propagation of ultrasonic waves in nondispersive media and the corresponding …
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Dynamic modelling of lightweight high-strength concrete under impact
… and compressive strengths, critical strains and elastic moduli. In the numerical analysis, the model is incorporated as a material subroutine in a well-established finite element software. In the experimental investigation program, both static and impact tests were carried out for two types of …
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X-ray Scattering Study Of Capillary Condensation In Mesoporous Silica
… forces acting on it. The Poisson's ratio and elastic moduli of the two samples and their annealed forms were estimated and compared quantitatively. Our study demonstrates a novel WAXS-based technique for calculating the mechanical properties of nanoporous materials with much wider …
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