Piezoelectric behavior of pre-stressed curved actuators under load

Pre-stressed curved actuators typically consist of a piezoelectric ceramic (lead zirconate titanate or PZT) laminated between various layered materials. In one configuration, THUNDER, the bottom layer is stainless steel and the top layer is aluminum; the metallic layers are attached to the PZT ceramic using a polymeric adhesive. In another configuration, Lipca-C2, the layers comprise a glass/epoxy composite and a carbon/epoxy composite. Experimental and numerical results of displacement performance under unloaded conditions have been investigated in the past. The results show that the Lipca-C2 devices produced more displacement than the THUNDER devices when clamped and unloaded. The present study includes a comparative performance of both devices under load to evaluate their lifting capability. Both out-of-plane and in-plane displacements are assessed as a function of load and voltage at low frequency. A non-contact laser was used for the out-of-plane measurements simultaneously with an optic fiber for in-plane displacement at 0 to 5N load values. The load is attached to one end of the actuators, and to avoid possible damage to the actuators, it is moved through a mechanism that utilizes a frictionless linear bearing and a pulley.

[1]  Ralph C. Smith,et al.  Modeling aspects concerning THUNDER actuators , 1999, Smart Structures.

[2]  Michael W. Hyer,et al.  Predicting the deformation characteristics of rectangular unsymmetrically laminated piezoelectric materials , 1998 .

[3]  R. W. Schwartz,et al.  Development of high performance stress-biased actuators through the incorporation of mechanical pre-loads , 2002 .

[4]  R. Bryant,et al.  Thin-layer composite unimorph ferroelectric driver and sensor properties , 1998 .

[5]  Harvey Thomas Banks,et al.  Evaluation criteria for THUNDER actuators , 1999, Smart Structures.

[6]  Modeling and Characterization of Geometric Effects on the Performance of Rainbow and Thunder Actuators , 2000 .

[7]  Paul D. Franzon,et al.  Load characterization of high displacement piezoelectric actuators with various end conditions , 2001 .

[8]  Ralph C. Smith,et al.  Low-field and high-field characterization of THUNDER actuators , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[9]  Aditi Chattopadhyay,et al.  Simultaneous Modeling of Mechanical and Electrical Response of Smart Composite Structures , 2002 .

[10]  N. Goo,et al.  ANALYSIS OF LIPCA-C ACTUATORS , 2003 .

[11]  Guomao Yang,et al.  Uniaxial stress dependence of the piezoelectric properties of lead zirconate titanate ceramics , 2000, ISAF 2000. Proceedings of the 2000 12th IEEE International Symposium on Applications of Ferroelectrics (IEEE Cat. No.00CH37076).

[12]  Nam Seo Goo,et al.  Thermal deformation and residual stress analysis of lightweight piezocomposite curved actuator device , 2001, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.