This paper studied the effects of delamination on composite structure behavior. Composite beams made of glass/epoxy and pure glass were examined. Experimental results were compared with analytical solutions which were based on a previously developed theory, namely the interlayer shear slip theory (ISST). The ISST accounted for both interlaminar shearstress continuity and displacement discontinuity conditions on the delamination interface. A finite element program was developed for delamination simulation. It was found from the studies that central deflections and fundamental vibration frequencies were not significantly affected by the changes of delamination length and location except when delamination extended to beam ends. In addition, the changes of deflection and vibration were not sensitive to the delamination position in the beam thickness direction except at midplane. Since both beam ends and midplane had maximum transverse shear stresses, it is concluded from these results that the modeling of delamination should consider the transverse shear effect.
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