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 47 for “"strain measurement"”.
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Strain measurement using neutron diffraction
… a study of improvement and application of strain measurement technique using neutron diffraction. A dedicated neutron strain scanner - ENGIN, funded by Ee. has been developed at ISIS. It has two radial collimators, allowing for the first time, measurements taken simultaneously at two …
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Optical fiber modal domain sensors for dynamic strain measurement
… especially for dynamic and in-service measurements. At the same time, optical fiber sensors have been identified as an ideal candidate for embedded and attached measurements of material parameters such as strain, temperature, or state of damage. In particular, sensors based on optical …
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Dynamic Strain Measurement Using Brillouin Optical Time-Domain Reflectometry
… can quantitatively measure the distributed strain and temperature information along the optic fibre. The Brillouin optical time-domain reflectometry (BOTDR) has the advantages of single-end access and simple operation at the construction site, which makes it very popular in civil engineering …
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Dynamic Strain Measurement Based Damage Identification for Structural Health Monitoring
… study is on the utilization of measured dynamic strains for damage identification in the framed structures which are composed of interconnected beam elements. Although linear accelerations, being more convenient to measure, are commonly used in most SHM practices, herein the strains being more …
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Low coherence fibre optic Fabry-Perot sensors suitable for multiplexed strain measurement
… Fabry-Perot interferometer sensors for the measurement of strain. There are a number of areas of modern engineering applications where there is a need for an alternative to conventional resistive strain gauges; particularly where a number of such sensors can be multiplexed onto a common …
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Dual-Use Strain Sensors for Simultaneous Strain Measurement and Acoustic Source Location
The use of metal strain gauges and ultrasonic transducers have long been studied in the field of Nondestructive Evaluation (NDE) as a part of structural health monitoring (SHM). Strain gauges use electrical resistance to monitor strains during the loading of a component. Ultrasonic transducers are …
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Surface Strain Measurement for Non-Intrusive Internal Pressure Evaluation of a Cannon
… is highest. An alternative, non-intrusive strain measurement method is introduced and discussed in the present work. This focuses on determining the feasibility and accuracy of relating tangential strain along the sidewall of a gun barrel to the drastic internal pressure rise created during …
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An Optical Method of Strain Measurement in the Split Hopkinson Pressure Bar
… methods of testing materials at medium rates of strain. Elevated rates of strain, such as those found in impact and explosive applications, have been shown to induce phenomena such as strain hardening and phase transitions that can significantly affect the strength of most materials [14]. Due to …
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A Novel Approach to Residual Stress Measurement
… thesis provides an authentication of a novel strain measurement and residual stress calculation method. This method is heavily rooted in the fields of optical strain measurement and elementary solid mechanics. The types of measurements discussed involve using two specialty optical strain gages …
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High resolution optical time domain reflectometry and its applications
… Optical Time Domain Reflectometry (OTDR) measurements have recently allowed spatial resolutions of less than one millimeter. These capabilities indicate that OTDR techniques may be suitable for non-conventional applications such as the determination of fiber strain. This thesis presents an …
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Temperature and strain sensing using rare earth fluorescence and Bragg gratings in optical fibres
… describes the study of the temperature and strain effects on rare earth fluorescence and Bragg gratings in optical fibres. The development and performance of simultaneous temperature and strain measurement systems utilising a combined technique of the fluorescence intensity ratio and the …
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Prototype Development and Feasibility Assessment of a Vertically Mounted Floating Element Skin Friction Balance
… in different experimental studies. The accurate measurements of wall shear stress will be instrumental in improving the existing empirical models and validating CFD models. Wall shear stress is also vital in improving fuel efficiency, heat transfer efficiency, and aerodynamic efficiency in …
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Digital image correlation analysis of alkali silica reaction in concrete with recycled glass aggregate
… the in-plane displacement and full-field strain of the surface of an object. DIC can be implemented as a low-cost non-destructive technique using a time series of images of the object of interest. The advantages of DIC inspires the application in studies of concrete alkali silica reaction …
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Instrumentation for multiaxial mechanical testing of inhomogeneous elastic membranes
… two-axis force transducers for high-resolution measurement of applied loads, and a digital imaging system for full-field strain measurement. The components described herein provide the foundation for a sophisticated biaxial testing platform for determining the mechanical properties of …
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Analysis of the Interface Properties of Multi-material 3D Printed Structures
… Digital image correlation (DIC) is a full-field strain measurement technique ideal for evaluating the non-uniform load response in anisotropic materials due to their heterogeneous composition. This thesis demonstrates the fabrication of MM3DP samples using two distinctly different printing …
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Distributed optical fibre sensors based on the coherent detection of spontaneous Brillouin scattering
… performance of a distributed temperature and strain optical fibre sensor based on the coherent detection of spontaneous Brillouin scattering. To further improve the sensing range and the sensor's performance, the use of Raman amplification was investigated utilising different Raman pump …
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Temperature and strain dependence of fluorescence in praseodymium-doped silica optical fibre
Temperature and strain measurement is an important requirement in many industrial processes. In areas where high electromagnetic fields, flammable environments or other adverse environments limit the use of electronic-based sensors, optical fibrebased sensors can be incorporated. In this thesis, …
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Determinação da fluência do concreto e do coeficiente de Poisson diferido em um estado de tensões de compressão bi-axial
Present and analyse the first results of direct strain measurement in the concrete of the test slab (prestressed slab in two directions) of the Laboratório de Estruturas do Centro de Tecnologia da Universidade Federal do Rio de Janeiro. The purpose of the work is to observe the creep of the …
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