Damage identification of laminated composite structures based on dynamic residual forces

This paper shows a damage identification method based on dynamic residual forces which can be evaluated using an analytical model of undamaged structures and measured vibration data of damaged structures. The method consists of a two-step damage detection procedure. In the first step, a rough damage region is identified from the dynamic residual forces. In the next step, error vectors of the residual forces are minimized to identify the accurate location and extent of structural damage. Effect of measurement points and measurement errors on the identification results is examined through numerical examples on symmetric laminated plates.