Abstract
A technique for enhancement of buckling loads of composite plates is proposed. The technique relies on using stress stiffening to create a non-zero tensile force acting along the plate plane which ultimately permits the application of higher external compressive forces that lead to traditional buckling instabilities. The idea is to completely restrain the plate movements in its plane direction, at all edges, and to apply voltages to pairs of symmetrically bonded piezoelectric patches. This voltage is applied such that the piezoelectric patches contract resulting in a uniform tensile force over the plate plane.
Highlights
Buckling of laminated plates caused by several types of loadings is one of the most relevant problems encountered in the area of composite structures
One technique available to increase buckling loads of this type of structure is to incorporate active elements, sensors and actuators, and control systems to such structures. These systems composed of host composite structure, active elements and control may have their buckling load increased with respect to the buckling load of the host structure if isolatedly considered
This paper proposes the use of piezoelectric actuators to enhance buckling of composite plates through stress stiffening effects
Summary
Buckling of laminated plates caused by several types of loadings (mechanical, thermal, etc.) is one of the most relevant problems encountered in the area of composite structures. One technique available to increase buckling loads of this type of structure is to incorporate active elements, sensors and actuators, and control systems to such structures. A finite element formulation was proposed for the analysis of laminated plates with an arbitrary number of piezoelectric actuators and sensors. De Faria [5] proposed the use of piezoelectric stiffening stresses to create a nonzero traction force acting along the axis of a laminated beam, allowing the application of an external compressive force greater than the buckling load of this beam without the presence of piezoelectric actuators. A.R. de Faria et al / The use of piezoelectric stress stiffening to enhance buckling of laminated plates 169
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