Monitoring the crack length of adhesively bonded carbon-fiber-reinforced polymer by using aligned graphene

Yang, Mei; Chuang, Po-Chun; Tsai, Jia-Lin

doi:10.1016/j.coco.2022.101177

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Instead of directly looking for defects, there are techniques suitable for real-time monitoring of the integrity degradation of adhesive joints. These include strain/stiffness monitoring using back face strain gages [ 21 , 22 , 23 ], optical fiber sensors signal surveillance [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], and resistance monitoring of conductive adhesive joints [ 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ]. Strain gages can only be applied to the outer surface.…”

Section: Introductionmentioning

confidence: 99%

“…For resistance monitoring, the adhesive joints were made conductive by adding particles such as carbon black [ 50 ], graphene [ 51 , 52 ], and carbon nanotubes (CNTs) [ 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 ]. Owing to their extremely high aspect ratio, CNTs are especially suitable for forming a conductive network and so are used extensively in research works on the health monitoring of adhesive joints.…”

Section: Introductionmentioning

confidence: 99%

“…In demonstrating their health monitoring capability, some works employed the double cantilever bending specimen with a mode I crack in the adhesive joint [ 52 , 53 , 54 , 64 , 67 ]. Crack extension reduces the remaining ligament, and so resistance increases by mechanism (4) above.…”

Section: Introductionmentioning

confidence: 99%

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Damage Monitoring of Composite Adhesive Joint Integrity Using Conductivity and Fiber Bragg Grating

Shin

Chen

2023

Polymers

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Adhesive joints possess a number of advantages over traditional joining methods and are widely used in composite structures. Conventional non-destructive examination techniques do not readily reveal joint degradation before the formation of explicit defects. Embedded fiber Bragg grating (FBG) sensors and the resistance of carbon nanotube (CNT)-doped conductive joints have been proposed to monitor the structural integrity of adhesive joints. Both techniques will be employed and compared in the current work to monitor damage development in adhesive joints under tensile and cyclic fatigue loading. Most of the previous works took measurements under an applied load, which by itself will affect the monitoring signals without the presence of any damage. Moreover, most FBG works primarily relied on the peak shifting phenomenon for sensing. Degradation of adhesive and inter-facial defects will lead to non-uniform strain that may chirp the FBG spectrum, causing complications in the peak shifting measurement. In view of the above shortfalls, measurements are made at some low and fixed loads to preclude any unwanted effect due to the applied load. The whole FBG spectrum, instead of a single peak, will be used, and a quantitative parameter to describe spectrum changes is proposed for monitoring purposes. The extent of damage is revealed by a fluorescent penetrant and correlated with the monitoring signals. With these refined techniques, we hope to shed some light on the relative merits and limitations of the two techniques.

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