Prediction of the Delamination at the Steel and CFRP Interface of Hybrid Composite Part

Abstract

The purpose of this study was to predict the adhesive behavior of steel and carbon-fiber-reinforced plastic (CFRP) hybrid parts based on the cohesive zone model (CZM). In this study, the steel sheet and CFRP were joined by epoxy resin in the CFRP prepreg during the curing process, which could generate delamination at their interface because of the springback of steel or the thermal contraction of the CFRP. First, double cantilever beam (DCB) and end-notched flexure (ENF) tests were performed to obtain various adhesion properties such as the critical energy release rate of mode I, mode II (GI, GII), and critical stress (σmax). A finite element (FE) simulation was performed to predict delamination using CZM, which was also used to describe the interfacial behavior between the steel sheet and the CFRP. Finally, a U-shape drawing test was performed for the steel/CFRP hybrid parts, and these results were compared with analytical results.

Experimental and Numerical Study on Mechanical Behavior of Steel/GFRP/CFRP Hybrid Structure under Bending Loading with Adhesive Bond Strength Assessment

“…Despite the considerable number of studies in the literature about the debonding failure of the steel/CFRP(n) adhesive joint [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], few systematic studies on the bond behavior between steel sheets and GFRP(m) polymer composites have been performed, and a very limited number of papers have been published that focus on this topic [ 28 , 29 , 30 , 31 ]. To the best knowledge of the authors, no research has been published on the mechanical behavior of the adhesive bonds between steel sheets and GFRP(m)/CFRP(n) hybrid composites under three-point bending.…”

“…Despite the considerable number of studies in the literature about the debonding failure of the steel/CFRP(n) adhesive joint [20][21][22][23][24][25][26][27], few systematic studies on the bond behavior between steel sheets and GFRP(m) polymer composites have been performed, and a very limited number of papers have been published that focus on this topic [28][29][30][31].…”