Laminated composites and sandwich structures are increasingly being used in aeronautical, marine and offshore applications where high stiffness and light weight are the primary issues. During their service life, these structures experience extreme loadings and harsh environmental conditions potentially leading to structural damage. In order to maintain the performance of the structure, localisation and quantification of the damage is a promising research area. Since the determination of the severity and the location of the damage is an inverse, non-linear and non-unique problem, an...