Dielectric studies of adhesively bonded CFRP/epoxy/CFRP structures — design for ageing

Halliday, Steven; Banks, W.; Pethrick, Richard A.

doi:10.1016/s0266-3538(99)00111-6

“…The test was designed around ASTM D 3433-93 [14] and ASTM D 3807-93 [15] and has been discussed previously [10][11][12]. The load was applied using the Zwick 1445 tensile testing machine, with a constant crosshead separation rate of 3 mm/min.…”

Section: Cleavage Testsmentioning

confidence: 99%

“…The details of the measurements have been discussed previously [10][11][12]. Prior to each test the surface of the joint was abraded to maximize the electrical contact between the joint and connector.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

“…An investigation by Li et al [9] of etched only, phosphoric and chromic acid anodized joints indicated that the changes in the dielectric profile with time reflected possible differences in the mechanism of ageing. These preliminary studies [10][11][12] were performed in an attempt to establish whether the dielectric measurements could detect changes in the bond line. In this paper, a systematic study is reported of the dielectric and mechanical studies of ageing of a series of adhesively bonded joints, aged both at constant temperatures and cycled between two temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dielectric and mechanical studies of the durability of adhesively bonded aluminium structures subjected to temperature cycling. Part 1: examination of moisture absorption

Pethrick

¹

,

Armstrong

²

,

Banks

³

et al. 2004

Proc. Instn Mech. Engrs, Part L: J. Mat

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Dielectric measurements and mechanical tests on adhesively bonded joints are reported for bonds having been aged by complete immersion in water at 50 and 65 C and by changing between these temperatures. Such joints have direct application to aircraft structures and other important engineering areas. The dielectric frequency domain measurements at 3 MHz are used to monitor moisture ingress into the adhesive bond. Initially the rate of change in the permittivity follows pseudo-Fickian behaviour consistent with simple moisture diffusion. In all the cases studied, acceleration in the rate of increase in the permittivity was observed consistent with the moisture converting the interfacial oxide layer to hydroxide. Time domain reflectometry (TDR) measurements indicate that physical changes occur in the bond line. Shear and cleavage measurements were performed at regular intervals and indicate a loss of mechanical properties of the bond. Comparison of the TDR measurements with ultrasonic and optical images indicated that the dramatic loss of mechanical properties is coincident with the observation of defects having been created in the interfacial layer. A correlation between certain of the mechanical properties and the change in the dielectric permittivity is observed.

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“…The details of the measurements have been discussed previously [10][11][12]. Prior to each test the surface of the joint was abraded to maximize the electrical contact between the joint and connector.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

“…Data were recorded in both the time and frequency domains. The method using time domain reflectometry (TDR) has also been described previously [10][11][12]. The joints were scanned between 1 and 9 ns and the first three reflections were recorded.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Dielectric and mechanical studies of the durability of adhesively bonded aluminium structures subjected to temperature cycling. Part 1: Examination of moisture absorption

Pethrick

¹

,

Armstrong

²

,

Banks³

et al. 2004

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Dielectric measurements and mechanical tests on adhesively bonded joints are reported for bonds having been aged by complete immersion in water at 50 and 65 C and by changing between these temperatures. Such joints have direct application to aircraft structures and other important engineering areas. The dielectric frequency domain measurements at 3 MHz are used to monitor moisture ingress into the adhesive bond. Initially the rate of change in the permittivity follows pseudo-Fickian behaviour consistent with simple moisture diffusion. In all the cases studied, acceleration in the rate of increase in the permittivity was observed consistent with the moisture converting the interfacial oxide layer to hydroxide. Time domain reflectometry (TDR) measurements indicate that physical changes occur in the bond line. Shear and cleavage measurements were performed at regular intervals and indicate a loss of mechanical properties of the bond. Comparison of the TDR measurements with ultrasonic and optical images indicated that the dramatic loss of mechanical properties is coincident with the observation of defects having been created in the interfacial layer. A correlation between certain of the mechanical properties and the change in the dielectric permittivity is observed.

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Adhesive bonding of composite aircraft structures: Challenges and recent developments

Pantelakis

¹

,

Τσερπές

²

2013

Sci. China Phys. Mech. Astron.

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Dielectric studies of adhesively bonded CFRP/epoxy/CFRP structures — design for ageing

Cited by 20 publications

References 6 publications

Dielectric and mechanical studies of the durability of adhesively bonded aluminium structures subjected to temperature cycling. Part 1: examination of moisture absorption

Dielectric and mechanical studies of the durability of adhesively bonded aluminium structures subjected to temperature cycling. Part 1: examination of moisture absorption

Dielectric and mechanical studies of the durability of adhesively bonded aluminium structures subjected to temperature cycling. Part 1: Examination of moisture absorption

Adhesive bonding of composite aircraft structures: Challenges and recent developments

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