Narrow Results

The dynamic stability of bidirectional woven fiber laminated glass/epoxy composite shallow shells subjected to harmonic in-plane loading in hygrothermal environment is considered. An eight-noded isoparametric shell element with five degrees of freedom is used in the analysis. In the present finite element formulation, a composite doubly curved shell model based on first-order shear deformation theory (FSDT) is used for the dynamic stability analysis of shell panels subjected to hygrothermal loading. A program is developed using MATLAB for the parametric study on the dynamic stability of shell panels under the hygrothermal field. The effects of various parameters like static load factor, curvature, shallowness, temperature, moisture, stacking sequence and boundary conditions on the dynamic instability regions of woven fiber glass/epoxy shell panels are investigated. The location of dynamic instability regions is shown to affect significantly due to presence of the hygrothermal field.

The present study deals with both experimental and numerical investigation on vibration behavior of laminated composite plates subjected to varying temperature and moisture. Extensive experiments are carried out for free vibration analysis of woven fiber Glass/Epoxy composite plates under hygrothermal conditions. The specimens were hygrothermally conditioned in a humidity cabinet where the conditions were maintained at high temperatures and moisture concentrations.

The present study deals with the parametric instability of woven fiber laminated composite plates subjected to periodic dynamic loadings in adverse hygrothermal environment. The effects of various parameters like increase in number of layers and lamination angle of simply supported composite plates at elevated temperatures and moisture concentrations on the principal instability regions are investigated using finite element method. The effects of transverse shear deformation and rotary inertia, is used to study the anti-symmetric angle-ply square plates. The results show that instability of woven fiber laminated composite plates occurs for different parameters with increase in adverse temperature and moisture environment.