Influence of active stiffening on dynamic behaviour of13; piezo-hygro-thermo-elastic composite plates and shells

Raja, S and Sinha, PK and Prathap, Gangan and Dwarakanathan, D (2004) Influence of active stiffening on dynamic behaviour of13; piezo-hygro-thermo-elastic composite plates and shells. Journal of Sound and Vibration, 278. pp. 257-283.

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Abstract

The active stiffening and active compensation analyses are carried out to present the influence of active stiffness on the dynamic behaviour of piezo-hygro-thermo-elastic laminates. A coupled piezoelectric finite element formulation involving a hygrothermal strain field is derived using the virtual work principle and is employed in a nine-noded field consistent Lagrangian element. The closed-loop system is modelled with elastic stiffness, active stiffness introduced byisotropic actuator lamina and geometric stiffness due to stresses developed by hygrothermal strain. Through a parametric study, the influence of active stiffening and active compensation effects on the dynamics of cross-ply and angle-ply laminated plates and shells are highlighted. The active stiffening on thin shells is significantlyinfluenced byboundaryeffects and the actuator efficiency further decreases with increase in curvature. The reduction in natural frequencies of cross-plylaminates due to hygrothermal strain is activelycompensated byactive stiffening; however, it is observed that the actuator performance reduces significantlywith increase in curvature particularly in angle-plylaminates, which demands the use of directional actuators. The active stiffening and active compensation effects are low in moderately thick piezo-hygro-thermo-elastic plates and shells, which are less influenced by boundary conditions.

Item Type:	Article
Additional Information:	Copyright belongs to Elsevier Science Ltd.,
Uncontrolled Keywords:	Piezo-hygro-thermo-elastic composite plates;Composite Plate;Composite plate and shells;Piezoelectric
Subjects:	CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User:	Mr. N A
Date Deposited:	16 Jun 2006
Last Modified:	03 May 2012 05:18
URI:	http://nal-ir.nal.res.in/id/eprint/1380

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