The behaviour of pre-twisted and tapered beams (such as turbine or helicopter blades) is characterized by stress distributions that may be quite different from those the usual beam theory, yielding couplings among bending, twisting traction. We propose a physical–mathematical model for accounts effects pre-twist cross-sections along centre-line. centre-line undergo large displacements, while it...

Vibration mitigation is a prominent matter in several engineering fields. Several adverse phenomena are related to vibrations, such as fatigue, noise, etc. The availability of smart materials increases the solutions for both vibration damping and energy harvesting applications. Piezoelectric seem be most promising these However, their positioning significantly affects efficiency. studies were p...

In many engineering applications it is often necessary to determine the flow of shear stresses in cross-sections beamlike bodies. Taking a cue from Jourawski's well-known formula, several scholars have proposed expressions for evaluating non-prismatic linear elastic beams, where longitudinal variations size and shape produces complex stress fields. present paper, new derived using mechanical mo...

We have developed dielectric-lined rectangular waveguide structures for terahertz (THz)-driven ultrafast deflection of 100 keV electron beams. The were designed to achieve THz phase velocity matching with co-propagating bunches. phase-matching capability was experimentally confirmed through time-frequency analysis the broadband coherent transmission measured by electro-optic sampling. determine...