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Periodic woodpile structures composed of slender cylindrical rods, defined as woodpile mechanical metamaterials herein, show versatile wave dynamics due to local resonances of slender rods. We numerically and experimentally investigate such resonance effects on nonlinear wave propagation in the woodpile mechanical metamaterials under impact excitations. We report these woodpile architectures exhibit...
We study the interaction of one-dimensional acoustic solutions with an inhomogeneous elastic medium containing a spherical void. We investigate the influence of the in homogeneity on the reflection of incident acoustic solutions using a hybrid model consisting of finite-element and discrete element methods. The reflection of incident acoustic solutions and the time of flights of reflections are found...
This paper investigates the use of a PMN-PT [001] piezoelectric actuator to be integrated in smart Micro-Opto-Electrical-Mechanicals Systems (MOEMS). Unlike most piezoelectric materials, PMN-PT [001] can generate large-stroke out-of-plane displacement. This is due to its very high longitudinal piezoelectric coefficient of up to 4500pm/V. After an introduction on MOEMS actuation and a short description...
Bending sensors are prospering in various fields because of their ability to sense the structural shape and deformation. Optical fiber can perform as bending sensor utilizing fiber gratings. Fiber gratings are categorized into two main types depending on the period of grating: FBGs which contain a sub-micron period length and LPFGs which typically own a period of 100-1000μm. LPFG-based...
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