Enhancement of fracture toughness in secondary bonded CFRP using hybrid thermoplastic/thermoset bondline architecture
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Accepted manuscript
Embargo End Date:
2022-08-11
Type
ArticleKAUST Department
Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant Number
CRG2017Date
2020-07-29Online Publication Date
2020-07-29Print Publication Date
2020-10Embargo End Date
2022-08-11Submitted Date
2020-01-29Permanent link to this record
http://hdl.handle.net/10754/664613
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Structures made of carbon fiber-reinforced polymer (CFRP) can be assembled using adhesive bonding. However, such bonding is prone to brittle delamination, and a method to improve delamination resistance is desirable. Here, we propose a technique to introduce crack-arrest features that increase the R-curve response by engineering the adhesive bondline/interface. We specifically designed a wavy net-like thermoplastic insert that was embedded into the thermoset adhesive bondline where the new mechanisms of energy dissipation were generated. We demonstrate that the technique is effective at improving mode I fracture toughness of secondary bonded carbon/epoxy by more than 400%. The hybrid thermoset/thermoplastic bondline architecture was carefully tailored to achieve its best performance. We demonstrate that introducing porosities in the adhesive bondline (by adding a limited amount of thermoset adhesive) further improves the fracture toughness. This toughness improvement originates from the extrinsic toughening of the crack-arrest feature, which is enabled by the insert ductility and microstructures (via strand formation, anchoring and stretching).Citation
Yudhanto, A., Almulhim, M., Kamal, F., Tao, R., Fatta, L., Alfano, M., & Lubineau, G. (2020). Enhancement of fracture toughness in secondary bonded CFRP using hybrid thermoplastic/thermoset bondline architecture. Composites Science and Technology, 199, 108346. doi:10.1016/j.compscitech.2020.108346Sponsors
The research funding was supported by Office of Sponsored Research (OSR) of KAUST (King Abdullah University of Science and Technology) under the award number OSR-CRG2017-3388. We also thank COHMAS Laboratory Researchers: Mr. Anh-Quan Vu for assisting preliminary FRT test, Mr. Omar Qahtani for preliminary DCB test and 3D printing and Dr. Ahmed Wagih for Mode II test data.Publisher
Elsevier BVAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S0266353820302967ae974a485f413a2113503eed53cd6c53
10.1016/j.compscitech.2020.108346