Composite materials take a large part in the aerospace industry, and keep getting ever more dominant in air-borne structures. There is at least one field in which composite materials had not yet become as advanced as metals, and that is NDI. In this work we try to find a solution for the problem of interlaminar delaminations in laminate composite materials. The aim for this work is developing an on-site (In-situ (method to be used in order to detect and evaluate a delamination.
The method we have chosen is a modal analysis of a beam, in order to detect a change in its natural frequencies, which will indicate the presence of delaminations. In order to achieve this goal a large amount of numerical analysis alongside vibration experiments were performed. The end result is a “recipe” for detecting delaminations using a minimal amount of sensors and equipment.
