The dynamics of a flexural beam actuated by induced strain surface bonded (piezoelectric) actuators is considered. The bending moment produced by the single actuator is evaluated by means of the pin-force model. A modal approach is then used to build special dynamic influence functions which explicitly account for the size and the position of the actuator. Simple optimal geometrical conditions are then obtained and illustrated for several cases with different boundary conditions.
The analysis of the free-edge stress distributions in composite laminates under uniaxial tension is approached by a finite element technique based on a multi-layer higher-order laminate theory.Several finite elements corresponding to different through-thickness assumed distributions of the displacement unknowns are developed.Numerous stacking sequences are examined in the applications. The results are compared with the ones obtained by various investigators with other modelling approaches.The use of the proposed technique is demonstrated to be simple and effective both for the analysis of in-plane and out-of-plane distributions of intralaminar and, noticeably, interlaminar stress components.
The static interaction between a laminate and distributed piezoelectric actuators is considered. In particular the problem of the stress concentration at the free edge of the active elements of a piezoelectric composite is investigated. A finite element model for the laminated composite plate is developed using a multi-layer higher-order finite element approach. A typical configuration is considered, in which two active layers are bonded on the top and bottom of a passive substructure. A pure bending case is investigated. The obtained results provide useful information of the typical static response. A parametric study is also performed on the effects of the main geometrical characteristics on the intensity and the extension of edge effect
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