Abstract
The local buckling and crippling of thin-walled graphite/epoxy I-section beams under axial compression is investigated. The initial design of the specimens is based upon procedures used for metal structures. The specimen webs are manufactured from laminated woven graphite C3000 cloth with a 5225 resin system. Five ply layups—(0) , (45/02/ 45)s, (0/452/0)s, (0)3s, and (45/0/45)s—are considered for the study. The specimens are cpmpressively loaded to subcritical load levels and the critical loads are estimated using a stiffness plotting technique. They are loaded to failure subsequently. The NASTRAN code is used to predict the overall buckling behavior of the I-section. The correlation of the experimental and analytical results supports the validity of the design procedure.
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