TY - JOUR
T1 - The effect of modified tannic acid (TA) eco-epoxy adhesives on mode I fracture toughness of bonded joints
AU - Saleh, Mohamed Nasr
AU - Tomić, Nataša Z.
AU - Marinković, Aleksandar
AU - Freitas, Sofia Teixeira de
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Eco-epoxy
KW - Adhesive
KW - Double Cantilever Beam (DCB)
KW - Digital Image Correlation (DIC)
KW - Mode I fracture toughness
KW - Digital image correlation (DIC)
KW - Double cantilever beam (DCB)
KW - Mode I fracture Toughness
UR - http://www.scopus.com/inward/record.url?scp=85101017329&partnerID=8YFLogxK
U2 - 10.1016/j.polymertesting.2021.107122
DO - 10.1016/j.polymertesting.2021.107122
M3 - Article
SN - 0142-9418
VL - 96
JO - Polymer Testing
JF - Polymer Testing
M1 - 107122
ER -