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

Jun-Su Park,Joon-Hong Park,Dae-Cheol Ko,Jae-Hong Kim

doi:10.3390/ma14216285

Jun-Su Park, Joon-Hong Park + Show 2 more

Open Access

https://doi.org/10.3390/ma14216285

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Journal: Materials	Publication Date: Oct 21, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Pusan National University, Dong-A University

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.

Highlights

Regulations on fuel efficiency and emissions have been tightened in the automotive industry owing to environmental pollution and the depletion of fossil fuels.As a result, the automotive industry has been focusing on manufacturing lightweight parts using magnesium, composite materials, advanced high-strength steel (AHSS), and carbon fiber reinforcement plastic (CFRP)
The purpose of this study was to predict the adhesive behavior in the forming process for steel/CFRP hybrid parts based on the finite element (FE) simulation with the cohesive zone model (CZM)
A conservative value, which was calculated by the compliance calibration method (CCM), was applied to the FE simulation of the U-shape drawing for the steel/CFRP hybrid part

Summary

Introduction

Regulations on fuel efficiency and emissions have been tightened in the automotive industry owing to environmental pollution and the depletion of fossil fuels. The automotive industry has been focusing on manufacturing lightweight parts using magnesium, composite materials, advanced high-strength steel (AHSS), and carbon fiber reinforcement plastic (CFRP). CFRP has been widely used because of its superior strength, stiffness, and fatigue performance compared with conventional lightweight metals. The application of CFRP could lead to high production costs and low productivity [1,2,3]. Recent studies have focused on the manufacturing of steel/CFRP hybrid parts to solve the aforementioned problems. Wang et al manufactured a hybrid part by forming a prepreg on an existing steel sheet using resin transfer molding (RTM) [4].

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