Flutter of Perforated Metallic Plates Repaired with Cross-Ply Composite Patches

Abstract

This study investigates the application of laminated composite patches for enhancement<br><br>of flutter behavior of perforated metallic plates repaired with an external composite patch.<br><br>Due to material anisotropy and discontinuity in geometry involved in flutter analysis of repaired<br><br>plates, closed form solutions are practically unobtainable. Numerical studies using commercial finite<br><br>element software were conducted to investigate the effects of variation in lamination parameters<br><br>on the flutter boundary of perforated plates repaired with cross-ply composite patches. Both<br><br>ply-level and sub-laminate level configurations are investigated. Presented results illustrate that<br><br>flutter boundaries of perforated plates can be changed by choosing proper stacking sequence for<br><br>composite patches.