The effect of modified tannic acid (TA) eco-epoxy adhesives on mode I fracture toughness of bonded joints

The effect of modified tannic acid (TA) eco-epoxy adhesives on mode I fracture toughness of bonded joints

Saleh, M. (TU Delft Structural Integrity & Composites)
Tomić, Nataša Z. (University of Belgrade)
Marinković, Aleksandar (University of Belgrade)
Teixeira De Freitas, S. (TU Delft Structural Integrity & Composites)

2021

Two synthesized eco-epoxy components based on TA: (A) glycidyl ether and (B) glycidyl phosphate ester, are used, as a replacement for the Bisphenol A (BPA) based epoxy component, for bonding aluminum (Al) and carbon fiber reinforced polymer (CFRP). Their effect on the mode I fracture toughness (GI) is evaluated by Double Cantilever Beam (DCB) testing while using Digital Image Correlation (DIC) for in-situ crack tip monitoring. Compared to the reference adhesive, an improvement of (GI) of Al (43%) and CFRP (100%) is obtained when using adhesive B. Moreover, regardless of the adherend material, a stick-slip pattern of crack growth is observed. Weak adhesion of the reference adhesive leads to an adhesive failure vs. a cohesive-adhesive failure in the case of adhesive B. On the contrary, the modification of adhesive A has an adverse effect on the GI of Al (-33%) and CFRP (-78%) as opposed to their reference counterparts.

Eco-epoxy
Adhesive
Double Cantilever Beam (DCB)
Digital Image Correlation (DIC)
Mode I fracture toughness
Digital image correlation (DIC)
Double cantilever beam (DCB)
Mode I fracture Toughness

http://resolver.tudelft.nl/uuid:a3e0964f-c3da-4b0d-beaa-0c81cf0815ed

https://doi.org/10.1016/j.polymertesting.2021.107122

0142-9418

Polymer Testing, 96

Institutional Repository

journal article

© 2021 M. Saleh, Nataša Z. Tomić, Aleksandar Marinković, S. Teixeira De Freitas