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Initial Buckling of Flat and Curved
Fiber Metal Laminate Panels

By K. Verolme
Sept. 1998
Delft University Press
ISBN: 90-407-1589-0
54 p.
$20.00 Paper Original

Local Buckling is expected to become an important design issue when metalic materials in conventional stiffened panels are replaced by Fiber Metal Laminates (FML). FML are bonded arrangements of thin metals sheets and alternating piles of highstrength fibers embedded in epoxy adhesive. Due to the high static strength of FML and their good fatigue and damage tolerance performance, thinner skin panels may be used. Together with the relative low stiffness this increases the importance of local buckling in design. This book describes an experimental study to validate the use of existing curved unstiffened FML panels. All existing design methods can be used for FML panels with the same efficiency and accuracy as for metals. Influences of collapse behavior and imperfections on the material mechanical behavior are equal for metalic materials and FML. Collapse is important for plates with a curvature parameter larger than approximately 7, while imperfections play an important role for plates with curvature parameters exceeding approximately 20. Initial buckling stresses can be predicted within a range of 0.9 and 1.1 times the experimental stresses for flat plates and 0.7 and 1.3 for curved plates (with the actual imperfections included in the analysis). It is clear that mroe work should be done for curved plates.

Mechanical Engineering
Series: Series 07 - Aerospace Materials