An improved analytical method for detection delamination location based on the natural frequency

In previous studies, the frequencies of a delaminated composite beam were computed with assumption of open or close delamination during the vibration. According to this assumption, two modes, i.e., free mode and constrained mode , are created in vibration of delaminated beam. In fact, a delamination may breathe (open and close) during the vibration of beam. In this paper, an analytical model is proposed for calculation of a delaminated composite beam based on the both free and constrained modes. The obtained results are compared with various theoretical and experimental results available in the literature. Results show the effects of the location and size of delamination on natural frequencies of delaminated beams. The comparison of improved combined natural frequency with theoretical and experimental results shows better agreement with them.

کلیدواژه ها:

Free vibration ، Composite beams ، delamination ، Natural Frequency