THE EFFECT OF DELAMINATION ON THE NATURAL FREQUENCIES OF A LAMINATED COMPOSITE BEAM

✍ Scribed by R.M. Gadelrab

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 231 KB
• Volume: 197
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1996.0532

✦ Synopsis

It is well known that the presence of the delamination in a composite laminated beam (CLB) introduces a local flexibility which changes the dynamic characteristics of the structure. The finite element method is used for modelling the CLB to obtain the effect of the delamination length and its starting point from the end condition on the natural frequencies. Typical cases of a delaminated composite beam with different boundary conditions are studied. The first three natural frequencies and their deviations with respect to those of the undelaminated beam are obtained. It is found that an increase of the delaminated region ratio increases the percentage deviation in the system natural frequencies. The effect of the starting point of the delaminated region with respect to the end condition depends on the modal bending distribution of the system. The typical frequency charts of the present study may be useful to engineering design and non-destructive testing analysis as a tool for diagnoses and detection of delamination in engineering applications by monitoring the frequency change.