POSTBUCKLING AND DELAMINATION GROWTH FOR DELAMINATED PIEZOELECTRIC ELASTOPLASTIC LAMINATED BEAMS UNDER HYGROTHERMAL CONDITIONS

摘要

The postbuckling and delamination growth for delaminated piezoelectric elastoplastic laminated beams under hygrothermal conditions are investigated. By considering hygrothermal environments, transverse shear deformation, geometrical nonlinearity and piezoelectric effect, the incremental nonlinear equilibrium equations of the piezoelectric elastoplastic laminated beams with delamination are obtained. The finite difference method and iterative method are adopted to solve the equations. Based on these, the delamination growth for the piezoelectric elastoplastic laminated beams is studied using J-integral theory. In the numerical examples, the effects of hygrothermal environments, transverse shear deformation, geometrical nonlinearity and piezoelectricity on the postbuckling behavior and delamination growth for the delaminated piezoelectric elastoplastic laminated beams are discussed in detail.