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This paper presents the results of a study on the effect of prescribed delamination on the fundamental and higher order buckling loads of laminated beam specimens. A simple one-dimensional model was used to determine the first four buckling loads of both homogeneous and laminated beams as a function of delamination position and length. The model results were validated with detailed finite-element analyses and with experimental data. The buckling loads of specimens with prescribed delaminations of various lengths were determined by measurement of load versus lateral deflection for Modes 1 and 2, and indirectly for Modes 1 through 4 by extrapolation of the beam natural frequencies taken under various levels of axial loading below the first mode buckling load.
Associate professor, University of California—Irvine, Irvine, CA
Staff manager, McDonnell Douglas Space Systems Co., Huntington, CA
Stock #: CTR10157J