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Buckling of Beam-Plates Having Multiple Delaminations

Institute of Mechanics, University of Stuttgart, 70550 Stuttgart, Germany

Hua-Nan Pu

Institute of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, 40227, R.O.C.

Chien-Chang Lin

Institute of Applied Mathematics, National Chung-Hsing University, Taichung, Taiwan, 40227, R.O.C.

An analysis procedure for determining the buckling load of beam-plates having multiple single delaminations is presented. Free and constrained models based on the usual beam-column theory are used for perfect and separated parts of delaminated segments. Successive corrections of buckled delaminated segments are made by inserting constrained models in the portions where overlapping of the upper and lower parts occurred in the segments of assumed free mode deformations. It appears to be the first time such analysis leading to buckling load with physically realistic mode of deformation has been considered. Recurrence equations relating integration constants of adjacent segments are established which lead to a 2 by 2 buckling determinant and allow direct determination of buckling mode along the entire beam-plate. Some numerical examples are presented for illustrative purposes. The procedure established appears to be simple, systematic and effective which should be useful for engineering applications.

Key Words: multiple single delaminations • beam-plate • buckling

Journal of Composite Materials, Vol. 31, No. 10, 1002-1025 (1997)
DOI: 10.1177/002199839703101003


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