8th European Workshop On Structural Health Monitoring (EWSHM 2016)
5-8 July 2016, Spain, Bilbao
Right Now in Bilbao 13:12 Thu 22
11:20 Thursday 7. Jul - A2
Damage Identification using Guided Waves on a Composite Skin-Stiffener Structure
Abstract »The potential of using guided waves for damage detection in composite materials has been proven by many researches in the past few years and in particular by the cases studies of the European project SARISTU. Important steps were made in that project on the one hand by developing integration methods for the piezoelectric wafer active sensors (PWAS) and on the other hand by the development of algorithms and a graphical user interface to allow for the analysis of the measured data without the need for detailed knowledge on guided wave based damage identification. The software, capable of dealing with experimental and numerical data, offers the possibility to control a series of settings to investigate specific features of the damage identification process and find the optimum settings in terms of robustness and reliability of the damage identification. Despite the proven potential, there is still a large number of questions to be answered before the guided wave based damage identification can be extended from detection to a fully automated, robust and reliable damage identification, including the nature and extent of the damage. This requires a further understanding, mainly by experimental investigation, of the physical phenomena occuring as guided waves travel through a multi-layered composite material and encounter a damaged spot. A composite panel with three T-shaped stiffeners is instrumented with 16 PWAS to further investigate the damage identification process and improve the implementation of the algorithms to reach a next level of robustness. The panel, a carbon fibre reinforced PEKK thermoplastic, with cobonded T-shaped stiffeners has a 16 layer midsection (2.1mm thickness, quasi-isotropic layup), while the end sections are thickened (30 and 44 layers). The HandyScope systems HS3 and two HS4 are used for the interrogation of the structure. An impact will be applied to the structure, after measurements of the pristine structure, to inflict a representative delamination damage underneath one of the stiffeners. Previous research has revealed impact causes first ply failure and skin-stiffener debonding. It is anticipated that this research will further close the gap between methods developed at research institutes and applications in the aerospace industry, as well as in the field of wind turbine monitoring.
AuthorsLoendersloot, Richard*Loendersloot, Richard*
Obtained PhD in 2006 on Permeability of Textile Reinforcements. From 2008 on assistant Professor at the University of Twente, Engineering Technology, Chair of Structural Dynamics & Acoustics, later chair of Dynamics Based Maintenance. Main research interest: monitoring aerospace, wind turbine and (rail)infra structures with dynamic methods. Participant in the consortium Twente Is Maintenance Excellence, umbrella organisation for research on maintenance topic, ranging from design to monitoring techniques.
University of Twente
NetherlandsBattley, MarkBattley, Mark
Following his BE (Hons) and PhD at the University of Auckland's Department of Mechanical Engineering, Mark worked as a Research Engineer for Industrial Research Limited from 1992 to 2005. He also worked at the Royal Institute of Technology, Stockholm Sweden from 1995 to 1996. In 2006 Mark joined Uniservices, working for the University of Auckland's Centre for Advanced Composite Materials (CACM) and established Applied Engineering Research Limited. In 2015 Mark joined the Department of Engineering Science at the University of Auckland, also continuing in his role as the Deputy Director of CACM.
Dr. Mark Battley
University of Auckland, Faculty of Engineering, Center for Advanced Composite Materials
New ZealandTinga, TiedoTinga, Tiedo
Prof. dr. ir. Tiedo Tinga is (part-time) full professor Dynamics based Maintenance at the University of Twente in the Netherlands. After working with the National Aerospace Laboratory for 10 years, Tiedo joined the Netherlands Defence Academy as associate professor Maintenance Technology in 2007 and became a full professor Life Cycle Management in 2016. Since 2012, he combines this position with the part-time full professorship at the University of Twente. His research focuses on improving the predictability of failures, aiming to improve preventive maintenance processes and to develop advanced predictive maintenance concepts. The research has a solid basis in understanding and modelling the physics of failure, which is combined with the development of advanced health and condition monitoring techniques and data analysis procedures. He currently leads projects on predictive maintenance of ships (Dinalog MaSeLMA project), railway infrastructure (with Strukton) and off-shore wind turbines (TKI Wind op Zee project WiMOS) and on structural health monitoring in the H2020 DestinationRail project (railway bridges), wind turbines (SLOWIND project TKI WoZ) and water mains (Wetsus).
prof.dr.ir. Tiedo Tinga
University of Twente