Calculating laminate composite stiffened-plate using finite element method

Based on the model of stiffened-plate element, this paper is concentrated on study to build the finite element algorithm and a program in MATLAB language which is applying to calculate and analyse in laminated composite stiffened-plate mechanical by using finite element method (FEM). The results of some regtangular stiffened-plate problems with the direction of blades are same as one of egdes of plate, will be compared with other results was made public to show the trust of model and finite element algorithm as well as of the program. In addition, there are some results was made to analyse effects of blades layout on the plate as well as the order of layers in bending ability of stiffened-plate. In there, Mindlin plate theory was applied.