This work is aimed at the development of a finite element formulation for the analysis of unsymmetric magneto-electric (ME) laminated structures. While analytical solutions are readily available for symmetric structures, the coupling between axial and bending deformations in unsymmetric structures impedes such an analytical solution thus motivating the search for a numerical solution. The proposed finite element model includes this coupling under Euler-Bernoulli assumptions and further includes the material nonlinearity exhibited by the ferromagnetic phase. The enhancement of the ME coefficient under resonant conditions has also been studied under bending and axial resonant regimes. Resonant ME coefficients of magnitude at least 30 times higher than the quasi-static values were estimated. A parametric study has also been performed with the aim of optimizing the ME coefficient with respect to the applied DC bias field, operating frequency, volume fraction and the modulus ratio of the constituents and the different boundary conditions. The boundary conditions yielding a cantilever configuration were found to offer the least bending resonant frequency and the highest axial resonant ME coefficient, thus proving to be the most viable in practice.
The modern-day armoured fighting vehicles (AFVs) are basically tracked vehicles equipped with hydro gas suspensions, in lieu of conventional mechanical suspensions like torsion bar and coil spring bogie suspensions. The uniqueness of hydro gas suspension is that it offers a nonlinear spring rate, which is very much required for the cross-country moveability of a tracked vehicle. The AFVs have to negotiate different cross-country terrains like sandy, rocky, riverbed, etc. and the road irregularities provide enumerable problems during dynamic loadings to the design of hydro gas suspension system. Optimising various design parameters demands innovative design methodologies to achieve better ride performance. Hence, a comprehensive kinematic analysis is needed. In this study, a methodology has been derived to optimise the kinematics of the suspension by reorienting the cylinder axis and optimising the loadtransferring leverage factor so that the side thrust on the cylinder is minimised to a greater extent. The optimisation ultimately increases the life of the high-pressure and high-temperature piston seals, resulting in enhanced system life for better dependability.
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