The prediction of laminate stacking sequence of E-glass/epoxy laminated composites using electromagnetic behavior of terahertz wave

The pulse type Terahertz time-domain spectroscopy(THz - TDS) system was used to investigate electromagnetic properties of E-glass/epoxy laminated composites. The complex relative permittivities was measured with respect to the angle between fiber orientation and electric field vector of Terahertz waves. For estimating its complex properties, theoretical models were developed and experimentally verified. Based on the results, the laminating sequence of E-glass/epoxy laminated composites was non-destructively identified by measuring complex relative permittivities in Terahertz frequency range.