KEYWORDS: Magnetism, Composites, Anisotropy, Microsoft Foundation Class Library, Magnetostrictive materials, Epoxies, Magnetic sensors, Polarization, Amplifiers, Ferromagnetics
The converse magnetoelectric effect of an asymmetric Piezo-fiber/Metglas bilayer laminate composite subjected to
mechanical prestress is presented. The mechanical prestress is applied by either dc electric voltage bias or direct
mechanical load bias. It is found that a mechanical prestress strongly influences the converse magnetoelectric coupling
response. The optimum dc magnetic field bias shifts with different prestress and compressive stress requires higher dc
magnetic field bias. Additionally, an optimum prestress exists to maximize the converse magnetoelectric response under
certain dc magnetic field bias ranges. Therefore, in order to integrate magnetoelectric composite into actual structures, a
proper prestress needs to be employed to maximize the CME coefficient.
This study characterizes the performance of embedded optical fiber Bragg gratings (FBGs) used as strain sensors. Focus
is provided to FBGs embedded in a quasi-isotropic lay-up of carbon fiber epoxy lamina both parallel and perpendicular
to adjacent structural fibers. It studies the birefringence induced during curing and quantifies the residual transverse
strain differences on the fibers by measuring the split from a single reflected Bragg wavelength into two. The association
between light polarization and loading directions relative to the optical fiber (in-plane parallel, in-plane transverse, and
out-of-plane transverse) are analyzed. Birefringence was seen to increase when a compressive out-of-plane load was
applied to the embedded optical fiber. In contrast, in-plane loads did not lead to an increase in birefringence as indicated
by reflected wavelengths that split during curing shifting equally and linearly during tensile load tests. An effective
strain-optic coefficient was determined that resulted in strong correlations between FBG and surface mounted electrical
strain gauge measurements.
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