The results show that the excitation frequencies of all simple and combinational instability regions shifted to lower frequencies with increasing delaminated width in composite plates.

• 实验中之激振力是非接触式之横向电磁力，且此电磁激振器之激发频率与激发振幅可由交流电源控制器控制，所以此种激振器可以避免实验中因轴向施力可能产生的干扰问题。