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 56 for “"hysteresis loop"”.
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The development and application of the load-stroke hysteresis technique for evaluating fatigue damage development in composite materials
… experimental method was developed to measure the hysteresis loss during a fatigue test from the load and stroke signals of a standard servo-hydraulic materials testing system. The method was used to characterize changes in properties and performance induced by long-term cyclic loading. Advantages …
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Modeling Shape Effects in Nano Magnetic Materials With Web Based Micromagnetics
… micromagnetics program is written to model the hysteresis loop of nano magnetic samples with arbitrary geometry shapes and multiple magnetic materials. Three material samples have been modeled with this program along with nano magnets with a variety of geometric shapes. Shape anisotropy has been …
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Ferroelectric System Dynamics and the Properties of Ferroelectric / Two-Dimensional Electron Gas Heterostructures: a Ginzburg–Landau Study
… model, we simulate the dynamic polarization hysteresis behavior of a ferroelectric system subjected to a sinusoidal electric field. We examine polarization hysteresis loop structure as a function of both field amplitude and field frequency. The relationship between the latter and hysteresis …
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Stress dependence of the magnetic properties of steels
… the material or component of interest through a hysteresis cycle and plot the magnetic response on the B,H (magnetic induction, magnetic field) plane. The result is a hysteresis loop, a typical example of which is given in Figure 1.1. The figure also shows a number of parameters that are used to …
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Post-stall hysteresis and flow field unsteadiness on an NACA 0012 airfoil
… field unsteadiness associated with static stall hysteresis on an NACA 0012 airfoil at Rec = 1.0 × 10^6. Unsteady pressure measurements were acquired to evaluate the performance of the airfoil, and a hysteresis loop was identified in the vicinity of the airfoil Cl,max. Two fundamentally different …
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Design of materials with small magnetic hysteresis: the unexpected role of magnetostriction.
… of the single domainstate on the shoulder of the hysteresis loop show that this method fails to predict the width of the hysteresis loop, a conclusion referred to as the ’coercivity paradox.’ We argue that the basic idea of using micromagnetics to predict coercivity is reasonable, but the fault …
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Aspect ratio effects on wings at low Reynolds numbers
… distance inboard from the tips. The size of the hysteresis loop and the Reynolds number at which hysteresis starts was found to be influenced by the aspect ratio. The momentum deficit method was used to validate the data obtained by the strain gauge method and there was adequate agreement between …
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Base isolation case study
… isolation system is analyzed, and especially its hysteresis loop. Results show that the inputted energy of the seismic forces is dissipated by hysteretic and modal damping.
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Hysteretic response of articular cartilage to cyclic loading
This research investigates the phenomenon of hysteresis in cartilage experimentally. The presence of a hysteresis loop in cartilage indicates energy loss, thereby signaling degradation of cartilage leading to osteoarthritis. Although hysteresis in ligaments and tendons has been studied to a great …
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Phase Field Crystal Approach to the Solidification of Ferromagnetic Materials
… strain theory. Finally we calculated the hysteresis loop of a single crystal by minimizing the material's magnetic free energy. These analytical calculations gave us an insight into the properties of the model. We then used numerical simulations to solve the dynamical equations of motion …
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Experimental evidnece for hysteresis in the cell cycles of Xenopus Laevis egg extracts
… predictions that the cell cycle is driven by a hysteresis loop have never been validated experimentally. The model's predictions of bifurcations that create and destroy MPF activity, indicative of hysteresis, were tested in this study. <u>Prediction 1: The threshold concentration of cyclin B …
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Validation of a Computational Model for Predicting Fatigue Life
… be computed as a function of the dissipation of hysteresis loop for a sequence of Ramberg-Osgood equations for a sequence of fatigue load cycles. This model does not use the Paris-Erdogan equation for crack growth. Two model parameters are the coefficients of the Ramberg-Osgood equation. The …
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Drain Diverter
… by using conductive probes. The system contains hysteresis loop, valve feedback, relay circuit, and facility interlock. The recycled water valve is immediately closed when the contaminated water is detected by the conductive probes. The Drain diverter is the project designed for the semiconductor …
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Non-invasive interventions top reduce low back dysfunction
… the normal. The evaluation is done by using the hysteresis concept. In this study, subjects received two different types of treatment: massaging using a mechanical massager for ten minutes and manual massaging by a professional physician. Using the Automated Anatomic Torsion Monitor (A-ATM), the …
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Inundation Flooding in Urban Environments using on-lattice Density Functional Theory
… the resulting isotherms exhibit a pronounced hysteresis, indicating the irreversibility of the flooding and draining properties at city scale. This hysteresis loop is of great importance since it provides a powerful means to qualitatively identifying the risk of inundation flooding.
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End plate gap effects on a half-wing model
… investigations found that the size of the hysteresis loop was affected by the tunnel environment and that single strut mounting of a three dimensional wing model interfered negligibly with the wing. Theoretical and experimental evaluations of a half wing model mounted with an end plate gap …
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The effect of free stream disturbances and control surface deflections on the performance of the Wortmann airfoil at low Reynolds numbers
… to dominate its performance and gives rise to a hysteresis loop for lift and drag. Changes in airfoil performance due to positive flap or control surface deflections resemble changes witnessed at higher Reynolds numbers. Negative deflections are seen to considerably change the stall behavior and …
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Numerical analysis of plastic deformation in metal-ceramic nanolayers during cyclic indentation
… plasticity results in an open load-displacement loop, and the indenter continues to move deeper with each cycle. For the control model of a homogeneous Al film, there is no hysteresis loop and transient behavior soon approaches stabilization, showing repetitive elastic loading/unloading. The …
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A TEM investigation of controlled magnetic behaviour in thin ferromagnetic films
… is applied (free layer). Ideally the free layer hysteresis loop would be centred at zero field, but because of magnetostatic interactions caused by layer roughness, the ferromagnets couple to one another and the hysteresis loop is offset. This shift means that the fields required to switch the …
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Modeling of magnetorheological elastomers
… or less, have characteristic pinched magnetic hysteresis loop shapes that are associated with rearrangement and clustering of magnetic particles within the surrounding polymer matrix. MREs have potential applications as vibration isolators and absorbers, soft actuators, sensors, and …
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