Strain Transfer Models for Strain Actuators
This paper develops one-dimensional and two-dimensional models for bending, coupled bending and extension of isotropic beams/plates with induced strain actuators. The adhesive layer between the actuator and the structure is considered in the Bernoulli-Euler formulation and the results for various models are compared with the uniform strain model which includes the shear lag effects with assumption of a finite thickness of adhesive layer. The reduction in actuation as a result of strain distribution inside the actuator is considered to improve the prediction ability of the existing model based on the Bernoulli-Euler formulation. The FEM model is also developed to study the strain transfer in the beam. Finally, an experimental test employing a macro fiber composite (MFC) actuator is carried out to evaluate the accuracy and limitations of the developed models. The models are in good agreement with the experimental results.
Alan K.T. Lau, J. Lu, Vijay K. Varadan, F.K. Chang, J.P. Tu and P.M. Lam
S. D. Bahador et al., "Strain Transfer Models for Strain Actuators", Advanced Materials Research, Vols. 47-50, pp. 254-257, 2008