Static Deflection Behavior of a Piezoelectric Forceps

2003 ◽  
Author(s):  
Ken Susanto ◽  
Bingen Yang
Keyword(s):  
Medical Device ◽  
Invasive Surgery ◽  
Piezoelectric Actuators ◽  
Slight Modification ◽  
Composite Beams ◽  
Static Deflection ◽  
Structural Components ◽  
Static Behavior ◽  
Piezoelectric Layers ◽  
Minimum Invasive Surgery

A model is described for predicting quasi-static behavior of a piezoelectric forceps actuator (PFA), which consists of two slightly curved composite beams with bonded piezoelectric layers. The PFA is an innovative medical device that is potentially useful for minimum invasive surgery. The PFA model is compared to the deflection measurements made by a curvature sensor in experiments. This model, with a slight modification, can also be applied to other types of piezoelectric actuators with curved structural components.

scholarly journals A critical review of reduced one-dimensional beam models of piezoelectric composite beams

2019 ◽  
Vol 30 (8) ◽  
pp. 1148-1162 ◽  
Author(s):  
Luca Luschi ◽  
Giuseppe Iannaccone ◽  
Francesco Pieri
Keyword(s):  
Three Dimensional ◽  
Beam Width ◽  
Composite Beams ◽  
Piezoelectric Composite ◽  
Beam Equation ◽  
Transverse Stress ◽  
One Dimensional ◽  
Piezoelectric Energy ◽  
Wide Range ◽  
Piezoelectric Layers

Simplified one-dimensional models for composite beams with piezoelectric layers, which are intrinsically three-dimensional structures, are important for many applications, including piezoelectric energy harvesters. To reduce the dimensionality of the system, assumptions on the stress/strain state in the transverse direction are typically made. The most common are those of null transverse stress, used for narrow beams, null transverse deformation, used for wide beams, and continuous interface strain, suited for thin piezoelectric layers (we call this assumption thin film continuous). We show that the models based on these assumptions are often used uncritically for beam geometries for which large errors may result. In particular, null transverse stress fails even for narrow beams if the thickness is much smaller than the beam width. We give clear geometric criteria that, for any geometry, allow the selection of the most accurate model among the three. We also develop a single, unified beam equation encompassing the three models and compare the analytical results from this equation with finite element simulations over a wide range of beam lengths, widths, and layer thicknesses. The selection criteria and the unified beam equation form a valuable tool for fast and accurate design of composite piezoelectric beams.

Static Deflection and Pull-In Instability of the Electrostatically Actuated Bilayer Microcantilever Beams

2015 ◽  
Vol 07 (06) ◽  
pp. 1550090 ◽  
Author(s):  
M. Mojahedi ◽  
M. Rahaeifard
Keyword(s):  
Scale Parameter ◽  
Couple Stress Theory ◽  
Beam Theory ◽  
Modified Couple Stress Theory ◽  
Length Scale Parameter ◽  
Length Scale ◽  
Static Deflection ◽  
Static Behavior ◽  
Stress Theory ◽  
Electrostatically Actuated

This paper deals with the static behavior of an electrostatically actuated bilayered microswitch on the basis of the modified couple stress theory. The beam is modeled using Euler–Bernoulli beam theory and equivalent elastic modulus and length scale parameter are presented for the bilayer beam. Static deflection and pull-in voltage of the beam is calculated using numerical and analytical methods. The numerical method is based on an iterative approach while the homotopy perturbation method (HPM) is utilized for the analytical simulation. Results show that there is a very good agreement between these methods even in the vicinity of the pull-in instability. Moreover, the effects of different parameters such as thicknesses of layers and length scale parameter on the static deflection and instability of the microcantilever are studied. Results show that for the cases with the equivalent length scale parameter comparable to the thickness of beam, the size-dependency plays significant roles in the static behavior of the bilayer microcantilevers.

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