11 research outputs found
An efficient coupled polynomial interpolation scheme for shear mode sandwich beam finite element
Modal Analysis for Optimized Placement of Piezoelectric Patches on a Composite Beam Structure
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Smart tetrachiral and hexachiral honeycomb: sensing and impact detection
In this work we present concepts and prototypes of a novel class of chiral honeycomb core with embedded sensing characteristics for potential structural health monitoring (SHM) and other multifunctional applications. The cellular structure concepts, all having negative Poisson’s ratio behaviour, have piezoelectric sensors and their hardware support embedded on the surface, or within the unit cell plates. Both the sensors and the infrastructure provide not only the capability of detecting signals proportional to the external mechanical loading, but act also as load-bearing units. The honeycombs have been produced using vacuum-casting techniques and resin transfer moulding methods, with micro fibre composites (MFCs) embedded in their cell walls. The sensing and mechanical performance of the prototypes are evaluated using finite element simulations, static tests, broadband vibration excitation and impact at low kinetic energy levels using an airgu
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Sensing and actuation of smart chiral honeycombs
A novel concept of auxetic (negative Poisson’s ratio) honeycomb for active microwave absorbers and structural health monitoring applications has been developed within the European FP6 project CHISMACOMB (CHIral SMArt honeyCOMB). The honeycomb concept is made of tessellating cylinders and joining ligaments to form a noncentresymmetric structure, with PMC devices embedded in the core. The honeycomb features a negative Poisson’s ratio effect, synclastic curvature, enhanced compressive strength properties and sensing and actuation characteristics because of the piezo elements embedded. A tetrachiral demonstrator is developed and manufactured, subjected to dynamic testing (modal analysis). The response of the piezosensors under broadband white noise excitation is measured to evaluate the sensing capabilities of the honeycomb. Actuation authority is probed using progressive voltage loading. Numerical models are developed to simulate the piezoelectric response of the smart honeycombs and their mechanical performance