STRESS ANALYSIS AND BUCKLING OF J-STIFFENED GRAPHITE-EPOXY PANEL

摘要

A graphite-epoxy shear panel with bonded-on J-stiffeners has been investigated. The panel was loaded to buckling in a picture frame shear test. Two finite element models, each of which included the doubler material bonded to the panel skin under the stiffeners and at the panel edges, were used to make a stress analysis of the panel. The shear load distributions in the panel from two commonly used boundary conditions, applied shear load and applied displacement, were compared with the results from one of the finite element models that included the picture frame test fixture. Analysis results show that the use of bonded doubler material under the stiffeners and at the panel edges in con¬junction with the test fixture loading produces a highly nonuniform shear load distribution in the panel. The analytical results were verified by comparison with strain and buckling results from the well-controlled laboratory test of the panel.