DYNAMIC INSTABILITY OF LAMINATES SUBJECTED TO TEMPERATURE-FIELD

The dynamic instability of laminated composite plates subjected to the rmal load is investigated. The formulation is based on first-order she ar deformation theory and Lagrange's equation of motion. The nonlinear ity due to moderately large deformation of the laminates is considered using von Karaman's assumption. The eigenvalue type of solution for t he nonlinear problem is evaluated through an iterative procedure. The boundaries of the primary instability region are presented using the r elationship between the excitation frequency of the temperature load a nd the amplitude of the dynamic load for various levels of amplitude o f vibrations of the laminates.