97 Chapter VI Concluding Remarks VI.1 Conclusions The aerofracture analysis on unidirectional composite plate conducted using finite element method (FEM) for the structural domain and doublet lattice method (DLM). The composite plate modeled as shell plate elements and the crack modeled as a slit in the surface. This method of modeling accommodates the physical motion of simple crack. Fiber orientation, to some extents, affects the shape of natural modes and the value of natural frequency, while it does not alter the sequence of modes. This evidenced in the MAC value results with 0° orientation. The fiber orientation did not massively transform the mode shape. In contrast, the natural frequency fluctuated under the variation of fiber orientation. Similarities between the , 90, and 90 + are observed within the MAC and natural frequency values. The crack parameters which are crack location and length has different contribution in the dynamic characteristics. The crack location did not significantly affect the dynamic characteristics, such as the mode sequence, mode shape, and natural frequency.