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Delamination in composite laminate structure may exist due to in-service conditions such as impact from foreign object damage, or due to built-in defects from instability in manufacturing processes. Under compressive loading, delamination reduces the overall stiffness and thus, lowers the critical buckling load of the laminate. In this research, the effect of single asymmetric delamination in composite laminate is analyzed from the one-dimensional modeling approach using two-dimensional finite element method. It is found that the size and position of delamination have significant influence over buckling load and its buckling mode.