HYGROTHERMAL EFFECTS ON THE DYNAMIC BEHAVIOR OF MULTIPLE DELAMINATED COMPOSITE PLATES AND SHELLS

• Published in: Journal of sound and vibration Vol. 248; no. 2; pp. 195 - 214
• Main Authors: PARHI, P.K., BHATTACHARYYA, S.K., SINHA, P.K.
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 22.11.2001; Elsevier
• Subjects: Computational techniques; Exact sciences and technology; Finite-element and galerkin methods; Fundamental areas of phenomenology (including applications); Mathematical methods in physics; Physics; Solid mechanics; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Vibrations and mechanical waves; Transient response; Hygrothermal variation; Double curvature; Stratified material; Free vibration; Isoparametric finite element; Temperature effect; Thermomechanical properties; Equilibrium equation; Modeling; Composite material; Finite element method; Shell; Quadratic approximation; Trapezoidal method; Delamination; Structural analysis
• ISSN: 0022-460X; 1095-8568
• DOI: 10.1006/jsvi.2000.3506

A quadratic isoparametric finite element formulation based on the first order shear deformation theory is presented for the free vibration and transient response analysis of multiple delaminated doubly curved composite shells subjected to a hygrothermal environment. A simple multiple delamination model developed by the authors earlier is employed to take care of any number/size of delamination located anywhere in the laminate. The analysis takes into account the lamina material properties at elevated moisture concentration and temperature. Newmark's direct integration scheme is used to solve the dynamic equation of equilibrium at every timestep during the transient analysis. Several numerical examples are considered and the results are compared with those available in the literature. The results show a reduction in the fundamental frequency with an increase in the percentage of uniform moisture content as well as temperature for simply supported antisymmetric crossply and angleply laminates for any size of delamination considered. The central dynamic displacements and the stresses at the center of laminates are observed to increase due to the effect of moisture/temperature subjected to the suddenly applied uniform pulse loading