Method research for post-buckling analysis of stiffened structure base on FEM

The load-carrying capacity calculation of skin-stringer stiffened structure is an important part of aircraft designing,and accurate simulation of stiffness modification is the key point of post-buckling computation technology.Investigation of structure idealization,element,material property and solution procedure selection based on FEM has been undertaken,and validated with a series stiffened panels and stiffened box.The numerical analysis results in failure mode and capability agree well with the test,and the error is less than 10%,prove the effectiveness of the present analysis methodologies.The work could provide some useful advices for the post-buckling computational analysis of stiffened structures.