Dr. Gerhard Hübschen worked for more than 30 years at the Fraunhofer Institute for Nondestructive Testing (IZFP), Germany, in the department for “Materials characterization, defect detection and lifetime management Dr. Iris Altpeter worked for more than 30 years at the Fraunhofer Institute for Nondestructive Testing (IZFP), Germany, and was the head of the department for “Materials characterization, defect detection and lifetime management. Dr. Ralf Tschuncky has been a member of the department for materials characterization at the Fraunhofer Institute for Nondestructive Testing (IZFP), Germany for more than 15 years. Prof. Hans-Georg Herrmann holds the chair of Lightweight Systems at Saarland University, Germany, and is also head of the department “In-service Inspection & Life-cycle Monitoring and deputy director at the Fraunhofer IZFP.