The ability to actively control the shape of aerospace structures has led to the implementation of Shape Memory Alloy actuators. These actuators can be used for morphing or shape control by modulating their temperature, which is effectively done by applying a voltage difference across their length. Characterization of this temperaturestrain relationship is currently done using constitutive mode...

The ability to actively control the shape of aerospace structures has spawned the use of shape memory alloy actuators. These actuators can be used for morphing or shape control by modulating their temperature, which is effectively done by applying a voltage difference across their length. Characterization of this temperature–strain relationship is currently done using constitutive models, which...

The memory elements, memristor being the best known of them, driven by a periodical waveform exhibit the well-known pinched hysteresis loops. The hysteresis is caused by a memory effect which results in a nonzero area closed within the loop. This paper presents an analytical formula for the loop area. This formula is then applied to memory elements whose parameter-vs.-state maps are modeled in ...

The dielectric and ferroelectric properties of the poly~vinylidene fluoride–trifluoroethylene– chlorotrifluoroethylene! terpolymers are studied in the temperature range 160–380 K. More attention was given to the dielectric loss in the dielectric spectra and the following results were obtained: ~1! there are two dielectric polarization mechanisms, modes A and B, contributing to the majority of t...

Nonmagnetostrictive CoFeSiB alloy wires were subjected to cold drawing processing followed by annealing under tension, in order to induce the formation of circular magnetic anisotropy. The axial (M Z – HZ) and circular (M f – Hf) hysteresis loops indicate the existence of induced transverse anisotropy, with the magnitude of the anisotropy field being dependent on the processing conditions, whil...

We studied theoretically the hysteresis behavior of ferroelectric thin films. The anomalous ferroelectric response is discussed by use of a bilayer model. Electrical conductivities of the films have been taken into account. To model the effects of the inhomogeneity of polarization and permittivity across the interface, the film is assumed to possess a secondary dielectric/ferroelectric phase sa...

We study dynamical hysteresis in a simple class of nonlinear ordinary differential equations, namely first-order equations subject to sinusoidal forcing. The assumed nonlinearities are such that the area of the hysteresis loop vanishes as the forcing frequency tends to zero; in other words, there is no static hysteresis. Using regular and singular perturbation techniques, we derive the first te...

We have developed a new technique of using a torque rnagnetomet.er to obtain M·H hysteresis loop of a uniaxial magnetic materiaL The hysteresis curve was obtained from the loop of the torque r measured as a function of an applied field H, when the direction of the applied field q, was 9" from the uniaxial orientation. This technique was applied to obtain the hysteresis curves of several Co/Pd m...

In this paper, how structure-sensitive parameters derived from the hysteresis loop, like coercive field, remanent induction, and hysteresis losses, can be used to characterise recovery and recrystallization in cold rolled Ti-Nb stabilised interstitial free ultra low carbon steel is shown. The effect on hysteresis measurements of isothermal annealing treatments applied to industrially cold rolle...