Modeling for piezoelectric-shape memory alloy composites

Abstract

A new concept of a piezoelectric ceramic/shape memory alloy (SMA) composite is proposed with aim of using this as a new actuator material with fast actuation speed and large strain. To prove the new concept, a new model is constructed based on Eshelby formulation where linear piezoelectric constitutive equations and bi-linear superelastic equations of SMA are used. The predictions of the strain induced by applied stress and electric field are made for two simple designs of piezo-SMA composites, 1-D series and 1-D parallel laminated composites. The proposed model indicated that 1-D parallel laminate provides the highest strain induced under bias stress and applied electric field among other composite geometries.

Synergistic smart morphing aileron: Experimental quasi-static performance characterization

“…For example, shape memory materials can be used as both fiber and matrix in a material, so that all elements of the composite can actuate to a greater extent on the same timescale (Jarali et al, 2010). Alternatively, a piezoelectric matrix was used to induce stress transformations within SMA inclusions in a piezo-SMA composite, increasing the ''actuation'' speed of the slower SMA (Lee and Taya, 2011). Finally, a flapping wing robot used SMPs to tune the stiffness of a flexure hinge for positioning a flapping wing actuated by a piezoelectric bimorph (Hines et al, 2012).…”

Review and perspectives: shape memory alloy composite systems

“…Similar effects have been explored for power generation and energy harvesting. To this end, the combination of thermally induced transformation piezoelectric effect in an SMA and PZT layer, respectively, was investigated both experimentally [311] and numerically [311,248].…”