TY - GEN
T1 - A Strain-Based Health Indicator for the SHM of Skin-to-Stringer Disbond Growth of Composite Stiffened Panels in Fatigue
AU - Milanoski, Dimitrios
AU - Galanopoulos, Georgios
AU - Broer, Agnes
AU - Zarouchas, Dimitrios
AU - Loutas, Theodoros
PY - 2021
Y1 - 2021
N2 - Real-time Structural Health Monitoring (SHM) of aeronautical structural components is a technology persistently investigated the last years by researchers and engineers to potentially reduce the cost and/or implementation of scheduled maintenance tasks. To this end, various types of sensors have been proposed to serve this role, e.g. piezoelectric, acoustic emission, and strain sensors. In the present paper, a strain-based SHM methodology is proposed for skin/stringer disbond propagation health monitoring. Fiber-optic strain sensors with engraved Bragg gratings are utilized in order to evaluate the propagation of artificially-induced disbonds at single-stringered composite panels. The specimens are subjected to a block loading compression-compression fatigue spectrum. Longitudinal static strains are periodically acquired during quasi-static loadings every 500 cycles. A Health Indicator (HI), based on strains received from the stringer’s feet, is proposed and utilized to monitor the disbond growth. The evolution of this indicator is experimentally monitored throughout the lifespan of the specimens. The present paper verifies and consolidates via actual fatigue experiments the potential of the proposed static-strain based HI developed from numerical data in our previous work.
AB - Real-time Structural Health Monitoring (SHM) of aeronautical structural components is a technology persistently investigated the last years by researchers and engineers to potentially reduce the cost and/or implementation of scheduled maintenance tasks. To this end, various types of sensors have been proposed to serve this role, e.g. piezoelectric, acoustic emission, and strain sensors. In the present paper, a strain-based SHM methodology is proposed for skin/stringer disbond propagation health monitoring. Fiber-optic strain sensors with engraved Bragg gratings are utilized in order to evaluate the propagation of artificially-induced disbonds at single-stringered composite panels. The specimens are subjected to a block loading compression-compression fatigue spectrum. Longitudinal static strains are periodically acquired during quasi-static loadings every 500 cycles. A Health Indicator (HI), based on strains received from the stringer’s feet, is proposed and utilized to monitor the disbond growth. The evolution of this indicator is experimentally monitored throughout the lifespan of the specimens. The present paper verifies and consolidates via actual fatigue experiments the potential of the proposed static-strain based HI developed from numerical data in our previous work.
KW - Composite stiffened panels
KW - Fatigue testing
KW - Fiber Bragg grating sensors
KW - Post-buckling
KW - Skin-to-stringer disbond growth
KW - Strain-based SHM
UR - http://www.scopus.com/inward/record.url?scp=85101241609&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-64594-6_61
DO - 10.1007/978-3-030-64594-6_61
M3 - Conference contribution
AN - SCOPUS:85101241609
SN - 9783030645939
T3 - European Workshop on Structural Health Monitoring - Special Collection of 2020 Papers - Volume 1
SP - 626
EP - 635
BT - European Workshop on Structural Health Monitoring - Special Collection of 2020 Papers - Volume 1
A2 - Rizzo, Piervincenzo
A2 - Milazzo, Alberto
PB - Springer
T2 - European Workshop on Structural Health Monitoring, EWSHM 2020
Y2 - 6 July 2020 through 9 July 2020
ER -