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Showing 1 to 20 of 44 for “"SHEAR MODULI"”.
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Resposta dinâmica não-linear da interação solo-estrutura no domínio da frequência
… damping is considered through the complex shear moduli. ln this way, the system steady-state response for an harmonic excitations is obtained. The nonlinear soil behavior is considered by performing a iterative linear analysis (Equivalent Linear Method) with values of shear moduli and …
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Comparison of Shear Modulus Test Methods
… veneer lumber (LVL) to determine if the shear properties evaluated by the different test methods were equivalent. Measured E:G ratios were also compared to the E:G ratio of 16:1 commonly assumed for structural wooden members. The average shear moduli results showed significant differences …
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Prediction of Linear Viscoelastic Response of the Loss Shear Modulus of Polymer-Modified Binders
… were developed to predict the storage and loss shear moduli of polymer-modified binders. However the model developed for the loss shear moduli is limited at high frequency (G" less than or equal to 10^7.5 Pa). This thesis presents a statistical modeling of loss shear modulus of polymer (random …
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Phase Behavior, Fluid Structure, and Slow Dynamics in Polymer -Colloid Mixtures: Novel Liquid State Theory and Its Applications
… to predict the gelation boundaries and elastic shear moduli for Rg/R < 0.1 suspensions. The calculated ""transient gel lines"" are in semi-quantitative agreement with measurements in deep quenched systems and buoyancy-matched systems. Calculations of the dependence of the elastic shear moduli on …
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Numerical Modeling and Analysis of Composite Beam Structures Subjected to Torsional Loading
… stress and constant strain, the effective shear moduli of the composite laminates are then derived. Upon obtaining the shear moduli of the equivalent homogeneous material, the effective torsional rigidity of the laminated composite rods can be determined by employing the theory developed by …
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Structure and Dynamics of Complex Fluids
… size. Anisotropy in molecular orientation and shear moduli of the confined film, which strongly depended on the relative direction between shear and the initial molecular orientation predetermined by the mica surface structure, was observed.
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ΣΥΓΚΡΙΤΙΚΗ ΜΕΛΕΤΗ ΤΟΥ ΕΡΠΥΣΜΟΥ ΜΕΤΑΞΥ ΧΗΜΙΚΩΣ ΠΟΛΥΜΕΡΙΖΟΜΕΝΩΝ ΚΑΙ ΦΩΤΟΠΟΛΥΜΕΡΙΖΟΜΕΝΩΝ ΣΥΝΘΕΤΩΝ ΕΜΦΡΑΚΤΙΚΩΝ ΡΗΤΙΝΩΝ
… DISTRILLED WATER AT 37 C BEFORE TESTING. SMALL SHEAR STRESSES BELOW THE MATERIALS' PROPORTIONAL LIMITS WERE MAINTAINED FOR 3 H AND RECOVERY WAS MONITORED FOR 30 H. THE STRESSES UTILIZED WERE 0.94.10-4 N.M, 1,48.10-4 N.M, 2,10.10-4 N.M. CREEP CURVES WERE OBTAINED AT 37 C AND THE ABOVE FOUR …
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Ultrasonics studies of point defects in iron, aluminum-lithium, and gallium arsenide
… by 2.3 MeV electron bombardment cause the shear moduli, $\rm C\sp\prime\ and\ C\sb{44},$ to soften by ($\rm-27\pm2)\%\ and\ (-17\pm4)\%,$ per at.% pair. The magnitudes are of the same order as for Cu, but the observed anisotropy matches that detected in Mo, the only other bcc metal tested.
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Critical current density in hot-pressed garnet Li7La3Zr2O12 solid state electrolytes
… stability with lithium metal, its shear moduli is also higher than most membrane materials, so it is one of the most promising solid state electrolyte materials. However, there are still dendrites penetrating under a small current density in …
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Axial, flexural and torsional rigidities of two-dimensional braided fibre composite medical catheters
… to predict the longitudinal tensile and in-plane shear moduli of 2D braided structures, needed for the calculations of the axial, torsional and flexural rigidities of braided tubes, was developed. The sensitivity of the model to key constituent and laminar properties was analysed. It was concluded …
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Effects of Shallow Bi-Angle, Thin-Ply Laminates on the Structural Performance of Composite Wings
… small decrease in their transverse and shear moduli. For the structural tests, we fabricate composite wing structures using an out-of-autoclave vacuum assisted resin transfer molding process. By conducting static bending tests, we show superior structural performances of the wing …
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Viscoelastic stress analysis of adhesively bonded joints
… non-linear viscoelastic analysis. Time-dependent shear moduli were calculated from the results of the latter analysis and compared with the experimentally obtained shear modulus of Krieger. Interface layers were defined in both the single lap and thick adherend analyses and the influence of …
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Studies of Biomacromolecule Adsorption and Activity at Solid Surfaces by Surface Plasmon Resonance and Quartz Crystal Microbalance with Dissipation Monitoring
… highly hydrated CMC layers with relatively low shear viscosities of ~ 10-3 N·s·m-2 and elastic shear moduli of ~ 105 N·m-2. Adsorption of pullulan 3-methoxycinnamates (P3MC) and pullulan 4-chlorocinnamates (P4CC) with different degrees of cinnamate substitution (DSCinn) onto cellulose, cellulose …
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An evaluation of the Iosipescu specimen for composite materials shear property measurement
… A finite element analysis of the Iosipescu shear test for unidirectional and cross-ply composites is used to assess the uniformity of the shear stress field in the vicinity of the notch, and demonstrate the effect of the nonuniform stress field upon the strain gage measurements used for the …
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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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A method for the ply-level elastic characterization of composite materials using thick tubular angle-ply specimens
… can be obtained except the out-of-plane shear moduli (G13, G23) which are not involved in the planar elasticity solution employed. The ply-level properties are estimated by inversion of the elasticity solution in terms of the global strain measurements. A Least Squares optimization …
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Some dynamic mechanical properties of apple fruits and their use in the solution of an impacting contact problem of spherical fruit
Complex compression moduli were determined for five groups of apples by subjecting cylindrical specimens to sinusoidal forcing at cyclic rates of 50 to 365 cycles per second. The five groups of apples consisted of Red Delicious, Winesap, and Golden Delicious at harvest and Winesap and Golden …
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Ultrasound detection using singlemode optical fibers with applications to epoxy cure monitoring
… can be accomplished by monitoring the bulk and shear moduli of the epoxy resin as it cures. The moduli properties of the resin determine the acoustic properties of the epoxy.<sub>[12],[13],[14]</sub> Hence measurement of the acoustic longitudinal velocity and attenuation of the epoxy during its …
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Mechanical Properties and Failure Analysis of Cellular Core Sandwich Panels
… were identified to have higher specific in-plane moduli and equivalent specific out-of-plane and transverse shear moduli. To consider practical use of the triangular cores, elastic and elastic-plastic structural analysis was performed to evaluate the stiffness, strength, failure, and energy …
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Describing the rheology of vibrated, no-slump concrete for application in 3D-printing construction
… The data fit well to a power-law model. The shear moduli and frequency parameter of the mixtures were characterized because they are required in the Hanotin constitutive model but the remaining two parameters, the critical strain and -parameter, could not be obtained from the experimental …
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