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.
Results
Showing 1 to 20 of 23 for “"dynamic impact"”.
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Modeling dynamic impact of layered structures
… approaches to simulate experiments involving dynamic impact of layered structures. Recent technological advances have allowed for the use of high-powered lasers to create strain rates above 10^7 1/s. However, experimental data of impact tests at these ultra-high rates is still sparse, so the …
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Finite element analysis of railway track under vehicle dynamic impact and longitudinal loads
Impact loads caused by flat spots on railcar wheels impose a major maintenance burden on railroads and can cause severe damage to both railcar and rail track components. In addition, the increasing tractive power of locomotives leads to significant increase in the longitudinal load demand in …
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Dynamic impact induced by tornadoes through simulations based on two-way wind-structure interactions
… achieve this, in this study, Computational Fluid Dynamics (CFD) simulations and Computational Structural Dynamics (CSD) simulations are combined for the first time to systematically investigate tornado dynamics and its dynamic impact on civil structures. First, wind effects on large-scale space …
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Modeling, Identification and Simulation of Dynamics of Structures With Joints and Interfaces
To account for both dynamic impact and friction, a general joint interface element is also developed. Here, segment-to-segment contact (SSC) is considered, and contact effects are accounted for along continuous edges of the elements. Thus, micro-scale stick-slip behavior along the joint interfaces …
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Floor Vibration Design Criterion For Cold-Formed C-Shaped Supported Residential Floor Systems
… cold-formed C-shaped residential floors systems. Dynamic impact and static loading tests were performed on twelve full size laboratory floors and five two-joist line laboratory floors to determine the influencing characteristics of annoying vibrations in metal framed floors. Similar tests were …
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High-rate deformation behavior and applications of fluid filled reticulated foams
… rates (strain rates between 10-2 - 1 s-1), under dynamic impact loading (with energy densities of e = 105 - 106 J/m3) and under high strain-rate deformations (strain rates up to 800 s-').
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Parametric impact characterisation of a solid sports ball, WITH a view to developing a standard core for the GAA Sliotar
… aim of this research was to characterise the dynamic impact behaviour of the sliotar core. Viscoelastic characterisation of the balls was conducted for a range of impact speeds. Modern polymer balls exhibited strain and strain-rate sensitivity while traditional multi-compositional balls …
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Energy absorption performance of braided basalt reinforced composite tubes under axial loads
… tests of these tubes under quasi-static and impact loads were carried out. A numerical model of sandwich tube with the highest energy absorption capability obtained experimentally was developed and validated with the experimental result. The main finding shows that sandwich tubes have better …
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Quantifying the Effect of Vitamin D Deficiency and Alcohol Exposure on Immune Response to Mycobacterium Infection
… & Simulation (MIDAS) Lab is to develop dynamic empirical and simulation-based models of host-pathogen interactions to further our understanding of the mechanisms guiding immunologic response. Previous studies on the role of vitamin D3 and its modulation of host response have shown …
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Impact-Induced Bridge Failures: Analyzing Structural Vulnerabilities and Optimizing Pier Designs for Enhanced Resilience
… patterns in recent years, bridge failures due to impact effects are becoming an increasing concern, especially for aging infrastructure. Following the recent collapse of the Francis Scott Key Bridge, issues regarding bridge vulnerabilities and design deficiencies arose, which highlighted the need …
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Impact Biomechanics of the Head and Neck in Football
… the biomechanics of the head and neck during impacts in football. The research related to the head is geared towards advancing the current understanding of the mechanisms of mild traumatic brain injury, specifically by investigating head accelerations experienced by football players during …
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Foreign portfolio equity flows in selected Sub-Saharan Africa Countries: the underlying process, impact on stock market capitalisation, and policy options
The volatility of capital flows and their adverse impact on macroeconomic and financial variables is a major concern to policy makers, resulting in a debate on whether capital controls or financial (capital account) liberalisation is best suited to managing them. This study argues that a better …
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Bioinformatics analysis of liver and adipose tissue microarray data from periparturient dairy cattle and development of a web-based ruminant specific microarray database
… In order to overcome these limitations, the Dynamic Impact Approach (DIA) has been developed by our group. This approach takes the concept of dynamism into consideration using proportion of differentially expressed genes compared to the genes present in array, statistically significant …
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Essays on spatial economics and trade
… question explores what the local and aggregate dynamic effects of regional migration flows are. To address this question, I combine a panel SVAR framework with a shift-share instrument based on lagged birth rates to analyze the short-, medium-, and long-term impacts of a 1% increase in migration …
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Fracture analysis in biomimetic Bouligand architectures
… mechanical responses and performances under dynamic impact, quasi-static uniaxial, and quasi-static biaxial loading. The results show that the biomimetic helicoidal composite has remarkable damage resistance under all loading conditions. These findings provide a better understanding of the …
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Structural Optimization of Thin Walled Tubular Structure for Crashworthiness
… investigation introduces a methodology to design dynamically crushed thin-walled tubular structures for crashworthiness applications. Due to their low cost, high energy absorption efficiency, and capacity to withstand long strokes, thin-walled tubular structures are extensively used in the …
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Strength Design Methods for Glass Structures
… principal stresses of a glass subjected to dynamic impact load is developed and validated. The developed model is general in the sense that it is applicable to arbitrary location of the impact as well as to structures of arbitrary boundary condition. The validation is made for a four-sided …
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Quantitative human reliability assessment in Marine Engineering Operations
… operations. The CREAM model demonstrates the dynamic impact of a context on human performance reliability through Contextual Control Model controlling modes (COCOM-CMs). CREAM human action analysis can be carried out through the core functionality of a method, a classification scheme and a …
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Dynamic Analysis of the impact of Capital Structure on Firm Performance in Nigeria
The thesis examines the dynamic impact of capital structure on firm performance in Nigeria. The aims of this thesis are; first, to investigate the impact of capital structure of firms on their performance in a dynamic framework. This is unlike previous studies in the capital structure literature …
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