Articles | |
NDT.net Issue: 2023-01 EWGAE35 & ICAE10 Conference on Acoustic Emission Testing, Ljubljana, Slovenia, September 2022 (EWGAE 2022) | Vol. 28(1) Special Issue of e-Journal of Nondestructive Testing (eJNDT) ISSN 1435-4934 Vol. 28(1) Session: Abstracts | |
Multimodal NDT monitoring of TRC sandwich under bending and early detection of interlaminar debondingNicolas Ospitia, Eleni Tsangouri9, Ali Pourkazemi2, Johan Stiens2, Dimitrios G. Aggelis32aDepartment Mechanics of Materials & Constructions (MeMC) bDepartment of Electronics and Informatics cDepartment of Mechanics of Materials and Constructions (MeMC); Vrije Universiteit Brussel (VUB) 63, Brussel, Belgium Abstract: Textile Reinforced Cementitious (TRC) sandwich composites provide a load-bearing, noncorrosive, lightweight, and durable alternative for steel-reinforced sandwich elements, and/or traditional steel-reinforced concrete. However, the composite nature of the material and slender nature of the facings render the fracture behavior complex. Insufficient interlaminar bond can cause premature debonding, substantially reducing the loadbearing capacity of the composite. Non-Destructive Testing (NDT) techniques seem the obvious choice to monitor the damage progression of the material without affecting, nor compromising the behavior of the composite, and predict their service life. In this study, TRC sandwich composites, subjected to quasistatic four-point bending, are monitored with three NDTs. Digital Image Correlation (DIC) allows to measure the surface strains and displacements. MMW Spectrometry, used for the first time in bending damage monitoring, allowed to detect damage such as cracking, or debonding, while Acoustic Emission (AE) allowed to localize and characterize internal cracking. In order to simulate premature debonding, the bond between the tensile TRC facing and the insulation, in the central zone, where the bending moment is maximum, was artificially destroyed. Results show that a weak interlaminar bond reduced the ultimate load of the composite by more than 50%. Additionally, DIC, AE and MMW Spectrometry proved useful to monitor and characterize damage. Multimodal data gathered from the multimodal NDTs showed to be complementary. DIC allowed to interpret AE and MMW Spectrometry data from a surface viewpoint, while AE parameters permit predictions at low load conditions, and detect internal cracking. For instance, the AE behavior at early load stage (less than 15% of the maximum load) of the TRC sandwich with destroyed bond showed significant differences than for the reference TRC sandwich. Specifically, it showed higher RA values, and lower AF than the reference TRC sandwich, suggesting more shear related early activity for, promoted by the damaged bond. Results were corroborated with DIC, while MMW Spectrometry seemed to follow closely the level of damage of TRC sandwich composites under quasi-static four-point bending. EWGAE 35, Ljubljana, Slovenia, 13th – 16th Sep. www.ewg Keywords: Digital Image Correlation (24), Acoustic emission (311), damage monitoring (6), MMW spectrometry, TRC sandwich, Comments or Questions? Share:
| |
Product Spotlight OmniScan™ X3 64 Flaw DetectorHoused in the field-proven rugged and portable OmniScan X3 enclosure,
the OmniScan X3 64 flaw dete ... OEM-PA MaxTop of the line performance FMC, PWI, Phased Array
Ultra-High speed (1GB/s)
AWG (Arbitrary Wav ... ELOTEST\HST - Heavy Plate Hard Spot TesterThe ELOTEST\HST 3 testing trolley is used for the detection of partial
hardening spots on heavy pl ... Valve Sense - the smart and mobile inspection system for leak detection in valvesValve Sense is a software-based inspection system which builds on the
well established method of a ... |
Subscribe