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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 25 for “"axial stiffness"”.
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Nonlinear axial stiffness characteristics of axisymmetric bolted joints
… which is based on a linear, one-dimensional stiffness analysis is presented. A detailed nonlinear finite element analysis of a bolted joint conforming to ANSI standards was performed. The finite element results arc presented in the classical bolted joint diagram and compared with the linear …
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Geometrically Nonlinear Aeroelastic Scaling
… show that internal loads can be insensitive to axial stiffness, even for globally indeterminate structures. A derived transverse to axial stiffness ratio can be used as an indicator of axial stiffness importance. Two findings of the work extend to geometrically linear applications: new sources …
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Design and Analysis of End-Effector Systems for Scribing on Silicon
… is passively controlled, has high lateral stiffness, and low axial stiffness. The mechanism is analyzed using the pseudo-rigid-body model and linear-elastic beam method to determine the axial stiffness, finite element methods to determine the lateral stiffness, and fatigue analysis to …
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Effect of existing building on tunneling-induced ground movements
… The HSS model with the selected set of stiffness parameters provides a reasonable fit with the PJ model and matches closely the greenfield settlement trough expected from empirical models. Numerical analyses are carried out to evaluate the effects of the self-weight, and equivalent …
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An incremental, non-linear displacement method for the elastic analysis of space trusses and plane frames
… the load at which the determinant of the stiffness matrix passes through zero. Chord shortening due to bowing of truss compression members which have an initial imperfection in straightness is included in the analysis by modifying the member axial stiffness term. Numerical examples of …
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Effects of Shallow Bi-Angle, Thin-Ply Laminates on the Structural Performance of Composite Wings
… bi-angle fibers and thin plies can increase the axial stiffness of laminates significantly at the cost of relatively 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 …
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Analysis of Composite Laminates with Matrix Cracks
… of effective laminate properties, such as axial stiffness, Poisson's ratio, shear modulus, and coefficient of thermal expansion, as a function of crack density and the axial stress redistribution due to the existence of matrix cracks. Both transverse cracks (2-D problem) and cross …
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Semi-rigid behaviour of plane timber structures
… of the joint as commonly studied, but also in axial and shear actions. The moment distribution between pinned and rigid analysis differs substantially and therefore a more accurate method of modelling the semi-rigid joint is necessary to predict the overall structure response. The level of …
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Mechanics of deformation of carbon nanotube-polymer nanocomposites
… of nanotube-enabled composites, using the axial stiffness as the common metric in all cases. Fully functionalized matrix-nanotube interfaces have enabled the separate investigation of load transfer internally in multi-wall nanotubes. Unit-cell RVEs with appropriate periodic boundary …
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Two Dimensional Analysis of Vibration Isolation of Rigid Bar Supported by Buckled or Pre-bent Struts
… vibration isolator, utilizing the post-buckled stiffness of elastic struts (or columns). The advantage of the post-buckled state is that ideally it can support more static load with a relatively small static deflection than traditional vibration isolators such as springs or rubber mounts, but …
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Numerical simulation of the response of sandy soils treated with pre-fabricated vertical drains
… as a truss element, taking into account the axial stiffness and assuming zero bending stiffness. The flow behavior is treated using the phenomenological Darcy-Weisbach equation. The elements are implemented in the Opensees framework. Two implementations are presented, one for laminar drains, …
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Lamb wave propagation in laminated composite plates
… lowest symmetric and antisymmetric curves. Stiffness reduction of composite laminates caused by damage can be related to the change in Lamb wave propagation speed. Damage in the form of transverse cracks in the 90° plies of a [90/90/90/0], graphite/epoxy laminate reduced the phase velocities …
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Regulation of cartilage metabolism by dynamic tissue shear strain and the mechanical characterization of cartilage
… purpose, a new instrument was developed to apply axial deformations as small as lµm and sinusoidal rotations as small as 0.5% up to 4% based on 1 mm thickness of tissue under feedback control. This apparatus is small enough (30 cm high x 25 cm x 20 cm) to be placed in a standard incubator for …
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Effect of ply drop-offs on the strength of graphite-epoxy laminates
… and analytically. Laminates were tested under uniaxial tension and compression. All the laminates were flat on one side with the plies dropped from the middle of a [( ± 45/0/90)<sub>s</sub> (N<sub>d</sub>) ( ± 45/0/90)<sub>s</sub>]<sub>T</sub> laminate, where N<sub>d</sub> denotes the number of …
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Silicon nanospring films for multifunctional interfaces
… pressure, with the lowest compressive film stiffness measured in the range of 13±0.2 MPa to 151±15 MPa for capped 4-turn springs with 900 nm seed spacing, and uncapped 10-turn springs with 1500 nm seed spacing, respectively, at 0.5 MPa applied pressure. Capped films showed higher resistance …
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Analysis and Design of Variable Stiffness Composite Cylinders
… shells through the use of the variable stiffness concept is presented. The variable stiffness concept implies that the stiffness parameters change spatially throughout the structure. This situation is achieved mainly through the use of curvilinear fibers within a fiber-reinforced …
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Behavior of concrete-filled pvc tube columns under axial load
… offers numerous advantages due to its large axial stiffness and capacity. In the system, steel is a common type of material and has been widely used. However, the application of FRP and PVC came into the picture as the alternative to the steel application in the system. In this study, the …
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MODELING AND TESTING OF WELDED STRUCTURAL JOINTS MACHINED WITH LASER CUTTING TECHNOLOGY
… In general, CHS joints exhibit higher initial axial stiffness than RHS joints due to their specific arch resistance mobilization against tensile loading. Some extra processes such as pre-welding surface oxidation removal and using additional welding passes, called special welding in this …
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Behaviour of continuous concrete T-beams reinforced with hybrid FRP/Steel bars
… to GFRP reinforced concrete T-beams improves the axial stiffness, ductility and serviceability in terms of crack width and deflection control. However, the moment redistribution at failure was limited because of the early yielding of steel reinforcement at the beam section that did not reach its …
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Prebuckling and postbuckling behavior of stiffened composite panels with axial-shear stiffness coupling
… to a uniform end shortening is presented. Axial-shear stiffness coupling is introduced by rotating the stiffener and/or prescribing skin laminates with membrane and bending stiffness coupling. A panel’s axial-shear coupling response is defined as the ratio of the panel’s shear load to its …
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