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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 36 for “"dynamic strain"”.
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Prions Propagate as Dynamic Strain Mixtures
… PrPSc. Phenotypic differences in disease (i.e., strains) have been observed for decades and are thought to be encoded by stain-specific conformations of PrPSc. There is evidence that prion strains exist as a mixture of multiple strains, containing a dominant strain, which is responsible for the …
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Spherical wave motion and dynamic strain measurements
Includes bibliographical references (pages 54-55).
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Optical fiber modal domain sensors for dynamic strain measurement
… evaluation prove inadequate, 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, …
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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 gage balance for M.I.T. transonic wind tunnel
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Aeronautical Engineering, 1951.
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Dynamic Strain Measurement Based Damage Identification for Structural Health Monitoring
… such approaches that utilize the measured dynamic response of structural systems are presented to detect, locate, and quantify the damages that are likely to occur in structures. In this study, the structural damage is identified as a reduction in the stiffness characteristics of the …
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Measurement dynamic strain induced by balloon-expandable endovascular stents in arterial walls
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Thermo-mechanical response and plastic deformation behavior of Hastelloy X at elevated temperatures — role of dynamic strain aging
… loading is investigated, and the phenomenon of dynamic strain aging is studied under isothermal and temperature jump experiments, using the technique of digital image correlation (DIC). The material of interest, a Ni-based superalloy, is widely used in high temperature applications, and it is …
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Methodology for innovative health monitoring of aerospace structures using dynamic response measurements and advanced signal processing techniques
… (SHM) of aerospace composite structures based on dynamic strain measurements in order to identify in an exhaustive way the structural state condition. Fiber Bragg Grating (FBG) optical sensors will be used for the recording of dynamic strain measurements from a composite structure. The methodology …
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The strain rate dependent mechanical properties and modelling of bovine cortical bone in compression
… Hopkinson bar experiments resulted in a specimen strain rate that decreases beyond reaching a maximum value at the rise time. The variation in dynamic strain rate was rectified by shaping the Hopkinson bar input pulse with a reusable, conical striker bar. The hypothesis investigated was that a …
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Effect of dislocation substructure on the primary creep behavior of alpha titanium at elevated temperature
… rate. This anomalous behavior is attributed to dynamic strain aging. The effect vanishes due to interstitial solute depletion as the interstitials are swept from the lattice by moving dislocations. The prestrained and recovered samples tested at 60006 did not show a creep arrest. This is …
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Experimental Characterization of Heterogeneous Deformation Due to Phase Transformations, Twinning, and Slip Deformation Using Digital Image Correlation
… transformation sequence, nuances of the stress-strain curve such as strain hardening and softening, the hysteretic behavior, the strain-rate dependence, twinning strain, twin-twin intersections, twin fraction evolution, dynamic strain aging, grain interactions, mesoscopic slip bands, and a RVE …
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Analysis of residual stresses in laser trimmed alumina microelectronic substrates
… x-ray diffraction residual stress analysis and dynamic strain measurements using strain gages before and after laser trimming. X-ray diffraction measurements were carried out in both the longitudinal and transverse directions on the front and back sides of the substrates. The dynamic strain …
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Chemistry, design, and processing of two-stage TRIP steel
… α</sup><sub>Chem</sub>. A model for the strain energy, ΔG<sup>λ→α</sup><sub>str</sub>, was formulated utilizing the Young’s modulus (E), lattice misfit squared (δ²), and molar volume (Ω) which opposed the chemical driving force for α-martensite formation. The M<sup>α</sup><sub>S</sub> was …
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FAILURE MECHANISMS OF ULTRA HIGH MOLAR MASS POLYETHYLENE SINGLE FIBERS AT EXTREME TEMPERATURES AND STRAIN-RATES
The effects of temperature and strain-rate on the mechanical properties of Ultra High Molar Mass Polyethylene (UHMMPE) single fibers was investigated at eleven temperatures from room temperature (20 °C) to the orthorhombic-hexagonal phase transition (148 °C) and at six strain-rates from …
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Cyclic deformation of a clay
Dynamic loading tests consisting of one hundred sinusoidal strain-controlled cycles at 0.2 cps. followed by a compression test to failure were conducted on remoulded, fully saturated clay triaxial specimens. Electrical transducers coupled with automatic recording equipment were used to measure …
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The effect of nitrogen and inclusions on fracture and fatigue of steel.
The dynamic strain ageing behaviour of seven heats of C-Mn steel and an interstitial free steel has been examined from 20°C to 350°C, using slow strain rate tests (SSRT's) at strain rates of 2 x 10[-6] s[-1] and 2.67 x 10[-6] s[-1]. The steels were chemically analysed for the key elements, …
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Investigations into the Ulnar Response to Mechanical Stimuli Activating Lamellar and Woven Bone Formation
… bone formation using damaging and non-damaging dynamic loading protocols, respectively. We observed a significant increase in gene expression related to angiogenesis, cell proliferation and osteogenesis prior to woven bone formation, with significantly lower levels of expression associated with …
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Interrogation of fibre optic sensors
… and low-coherence interferometry to measure dynamic strain and displacement using fibre Bragg grating and interferometric sensors. Based on the intrinsic properties of arrayed waveguide gratings and acousto-optic tuneable filters used in conjunction with interferometry, fibre Bragg gratings …
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Development of a statistical method for validating ESDM strain-field output
… a statistical method for validating the ESDM strain-field output. Specifically, it addresses the problems of estimating the ESDM strain-field uncertainty, choosing an appropriate standard measurement, estimating the uncertainty in the standard measurement, and comparing the ESDM strain-fields …
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