Global ETD Search
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 35 for “"strength degradation"”.
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Strength Degradation of Gfrp Bars
… objective of this research was to examine the strength degradation of Glass Fiber Reinforced Polymer (GFRP) bars at high temperature and alkalinity and determine if an Arrhenius type relationship can be used as a means of projecting life. The work done includes a thorough literature review, …
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Age-Related Ankle Strength Degradation and Effects on Slip-Induced Falls
… specifically, the relationship between ankle strength, the ankle joint power to transfer the whole body center-of-mass during normal gait, and the likelihood of slip-induced falls was identified. The walking experiment and the ankle strength tests were conducted in the Locomotion Research …
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Shear Strength and Strength Degradation of Concrete Bridge Decks with GFRP Top Mat Reinforcement
… of this research was to investigate the shear strength of concrete bridge decks with GFRP top-mat reinforcement. Several models currently exist to predict the shear strength during the design process; however, previous research at Virginia Tech indicates that the existing equations are overly …
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Effect of Hysteresis Type on Drift Capacity for Global Collapse of Moment Frame Structures for Seismic Loads
… lead to different levels of response because of degradation in strength and stiffness. To examine the existence and magnitude of this effect, this research aims to: (1) Determine the global collapse capacities of several classes of moment frame buildings under seismic loads. (2) Develop the basis …
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Three-dimensional non-linear finite element analysis of reinforced concrete beams in torsion. Reinforced concrete members under torsion and bending are analysed up to failure. A non-linear concrete model for general states of stress including compressive strength degradation due to cracking is described.
… incorporates three models to account for the degradation in the compressive strength of concrete due to presence of tensile straining of transverse reinforcement. The numerical solutions obtained for reinforced concrete panels under pure shear and beams in torsion and combined torsion and …
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An analytical model of strength loss in filament wound spherical vessels
The ability to predict potential strength degradation of a filament wound sphere was developed using an incremental finite element model of the composite during fabrication. The sphere was modeled taking into account the winding/loading pattern and the resulting internal layer boundaries. The …
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Effects of residual stresses and initial imperfections on earthquake response of steel moment frames
… stresses and initial imperfections. Cyclic strength degradation at beam-to-column connections was also considered to examine the potential interaction it may have with the other parameters. Whereas the well-known impact of strength degradation on cyclic stability was noted, residual stresses …
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Evaluation of Connection Fracture and Hysteresis Type on the Seismic Response of Steel Buildings
… determining the design forces. Linear, bilinear, strength degradation, stiffness degradation, and connection fracture models were used to determine the effects of hysteresis type on multi-degree-of-freedom (MDOF) structural systems.
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A fabrication stress model for axisymmetric filament wound composite structures
… material cure transition, and fiber stiffness degradation in a compressive strain state. Two case studies were selected to evaluate and to illustrate the use of the fabrication stress model: the space shuttle booster Joint overwrap and a filament wound composite bottle. The analysis results of …
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Reaction processing for the development of ultra-high temperature ceramics
… that exceed 3000⁰C, the potential for strength retention at elevated temperatures, and moderate oxidation resistance when compared to high temperature carbides. However, diborides have often been reported to exhibit low strength and significant strength degradation by 1500⁰C; therefore, …
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Inelastic Cyclic Behavior of Bolted Flange Plate Connections
… and 3.0% plastic rotation without significant strength degradation. The participation of BFP connection components in the inelastic behavior depends upon the relative strength and strain hardening of BFP connection components. The slip behavior results in more energy dissipation for BFP …
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NFEA Modeling of RC Beams Having Exposed Longitudinal Reinforcement: Effects of Debonding on Shear Behavior
… become irregular after cracking and due to other strength degradation effects. This approach enabled the proposal model to provide a more complete description of the shear stress distribution over the depth of the cross section over the entire loading history. Validation of this method is made …
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Modeling The Fluid To Solid Transition In Cement Paste, Mortar, And Concrete
… by penetration resistance and compressive strength. The primary focus is on correlating or predicting the outcomes rather than on the internal growth mechanism itself, which in this case is the hydration of Portland cement. Also, the proposed framework makes it possible to predict the …
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Durability of Advanced Woven Composites in Aerospace Applications
… that the results could be used in a residual strength based life prediction approach that accounted for both the mechanical fatigue and environmental conditions. Damage mechanisms and failure modes were determined through fatigue testing, residual strength testing, and nondestructive …
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Stress-induced Damage and Post-fire Response of Aluminum Alloys
… construction because of their light weight, high strength, and corrosion resistance. One of the major concerns regarding the marine application of aluminum alloys is their mechanical performance in fire scenarios. The material strength may be degraded due to both thermal and mechanical damage …
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Evaluation of ceramic candle filters degradation and damage location using four-point bending tests
… used in demonstration plants have experienced degradation and fracturing. Preliminary examination of these ceramic filters indicated that damage of the filters may have resulted from strength degradation due to persistent high temperature operation, thermal transient events, excessive ash …
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TISSUE ENGINEERING CELLULARIZED SILK-BASED LIGAMENT ANALOGUES
… altering scaffold properties (i.e. mechanical strength, degradation rate, permeability, and bioactivity) to create electrospun structures tailored to unique tissue specific applications; the end goal being the creation of a cellularized tissue engineering ligament analogue. To alter the …
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Fiber fracture in continuous-fiber reinforced composite materials during cyclic loading
… compared to other lay-ups. Even if stiffness degradation was significant, due to the nature of damage in this material system it would be impossible, practically, to monitor that change using conventional techniques (e.g. an extensometer) because the damage and failure process destroys the …
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Hysteresis modeling of wood joints and structural systems
… (1) nonlinear, inelastic behavior, (2) stiffness degradation, (3) strength degradation, (4) pinching, and (5) memory. The constitutive law takes into account the experimentally observed dependence of wood joints' response to their past history (Le., the input and response at earlier times, or …
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Long Term Durability of Glass Reinforced Composites
… effects, such as fatigue or hygrothermal degradation, and aids designers by establishing an unchanging base set of initial (undamaged) material design properties. The second portion of this dissertation discusses the effects that mean stress and R-ratio have on the fatigue performance of …
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