Comments on: ‘Curvature Mode Shape-based Damage Assessment of Carbon/Epoxy Composite Beams’

The primary motivation for the article sprouts from the article by Lestari et al. [Lestari, W., Qiao, P. and Hanagud, S, 2007. ‘‘Curvature Mode Shape-based Damage Assesment of Carbon/Epoxy Composite Beams,’’ Journal of Intelligent Material System and Structures, 18:189—208], published in a previous issue of this journal. The article although very useful and informative, as it conducts a wide array of experiments on different types of damages for a beam, has some discrepancies in the solution to the perturbed ordinary differential equation. The inconsistency manifests itself as a higher order effect. A possible solution to the equations is presented. Also, in this article the process is extended and the change in mass is taken into account along with change of stiffness. Only stiffness change is modeled in the original article.