研究目的
Investigating the detection of kissing bonds in adhesively bonded joints using a novel adhesive sensor based on electric time domain reflectometry.
研究成果
The novel ETDR adhesive sensor can detect kissing bonds under load, showing potential for use in structural health monitoring systems to increase confidence in adhesive bonds. Further development is needed to enhance sensitivity and integrate conductors into adherents for practical applications.
研究不足
The sensor's current configuration requires mechanical load to detect kissing bonds, and the integration of conductors into the adherents for higher shear strength is a challenge. The sensitivity to detect smaller, more realistic kissing bond sizes and shapes needs improvement.
1：Experimental Design and Method Selection:
The study employs electric time domain reflectometry (ETDR) for detecting kissing bonds in adhesively bonded joints. A finite difference time domain (FDTD) model is used for numerical calculations to support the sensor principle.
2：Sample Selection and Data Sources:
Single lap shear specimens made of glass fiber reinforced plastics (GFRP) as adherents and epoxy resin as the adhesive layer, with varied areas of kissing bond introduced by an ETFE-based release film.
3：List of Experimental Equipment and Materials:
GFRP laminate Polydet PowerStar, structural adhesive DOW Betaforce 2850, shielding 3M Scotch 1181 conductors, Airtech Flashbreaker 1 tape for introducing kissing bonds, time domain reflectometer Sympuls D-TDR 3000, universal testing machine Zwick Roell UPM 1465, and GOM ARAMIS system for DIC.
4：Experimental Procedures and Operational Workflow:
Preparation of adhesive surfaces by sandblasting, application of conductors and kissing bond inducing tape, bonding and curing of specimens, mounting to universal testing machine, and conducting ETDR and DIC measurements under varying displacement levels.
5：Data Analysis Methods:
Analysis of ETDR impedance signals and DIC strain fields to detect differences in deformation indicative of kissing bonds.
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Polydet PowerStar
GFRP laminate used as adherents in the study.
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DOW Betaforce 2850
DOW
Structural adhesive based on polyurethane (PUR) used in the study.
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3M Scotch 1181
3M
Shielding used as flat conductors in the sensor.
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Airtech Flashbreaker 1
Airtech
Tape used for introducing kissing bonds in the adhesive joints.
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Sympuls D-TDR 3000
Sympuls
Time domain reflectometer used for ETDR measurements.
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Zwick Roell UPM 1465
Zwick Roell
Universal testing machine used for tensile shear tests.
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GOM ARAMIS
GOM
3D movement and deformation measurement system used for DIC.
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