A method is proposed to identify the various damage state in a composite laminate using an embedded fiber Bragg grating (FBG) sensor. Numerical analysis to calculate a reflection spectrum of an FBG sensor is directly linked to a damage analysis based on layer-wise finite element method. ill this damage analysis, cohesive elements are arranged at interfaces where cracks or delarninations may occur to represent extension of these damages. Then solving the inverse problem ofthe relationship between the damage state and the reflection spectrum, we estimate the positions and the sizes of various types of damages in a composite laminate. This inverse analysis is applied to the experimental results of a tensile test for a double-edge-notched CFRP cross-ply laminate with an embedded FBG sensor. Minimizing errors between the reflection spectrum measured in the experiment and the temporarily-estimated one, it is found that the estimated damage state corresponds well with the one observed in the experiment.
|Title of host publication||Composites Technologies For 2020|
|Publisher||Woodhead Publishing Limited|
|Number of pages||6|
|Publication status||Published - 2004 Jun|
ASJC Scopus subject areas
- Materials Science(all)