Abstract
Development in material science impose to use different materials in production. This causes a problem for joining different materials because traditional joining techniques such as welding could not overcome this problem in industries such as automotive. Hence, adhesive bonding overcomes this problem by its superiorities to join different materials. Joint strength of epoxy-based adhesives are affected by adhesive thickness, adherent’s surface quality and curing conditions. In this study, two different materials (SAE 304 and AL7075) were bonded by epoxy adhesive (3M DP460NS) as single lap joint (SLJ) of Aluminum-Aluminum, Steel-Steel and Aluminum-Steel. Effects of adhesive thickness (0.05, 0.13, 0.25 mm) and surface roughness (281, 193, 81 nm) to strength were compared. SLJs were tested for 1, 10, 25 and 50 mm/min displacement rates. Adhesive surface structures were imaged by Scanning Electron Microscopy (SEM) to investigate adhesive fractures. Surface roughness’s were examined by using Atomic Force Microscopy (AFM) to compare its influence on failure load. Finite Element Analysis (FEA) were conducted by using Cohesive Zone Model with ANSYS 18.0 software to obtain stress distribution of adhesive. Optimum values according to the present conditions of thickness(0.13mm) and roughness(<200nm) were determined. Experimental results were demonstrated that while displacement rates rose, failure loads increased as well. FEA analysis were fit to experimental results. It has been observed that along with material type, peel stresses become an important factor for joint strength.
Highlights
A erospace, naval and automotive industries have been using composite materials along with steel and aluminum for structure lately
Further study by Grant et al [16] concluded that while adhesive thickness increased, the bending moment amplified. This caused a decrease of joint strength which is related to Niranjan's second consideration. This adhesive thickness is widely accepted as optimum adhesive thickness for Single lap joint (SLJ), it needs to be investigated more due to the reliance of stress on the single lap joint, its dependence of strain rate and adherend material
This study aims to investigate the strain rate dependency of the single lap joint by using different metal adherents
Summary
A erospace, naval and automotive industries have been using composite materials along with steel and aluminum for structure lately. Some of the studies report different adhesive strengths with high fluctuation [5,11,12,13] experiments need to be performed by considering all factors into account to clarify results From this perspective of view, separate works have been conducted by researchers by taking thickness, overlap length, adherend type, adherend thickness, strain rate, and surface quality into consideration. This caused a decrease of joint strength which is related to Niranjan's second consideration This adhesive thickness is widely accepted as optimum adhesive thickness for SLJ, it needs to be investigated more due to the reliance of stress on the single lap joint, its dependence of strain rate and adherend material. Campilho et al [23] inspected triangular, trapezoidal and exponential CZMs and concluded that triangular CZM has been used most, all of these models predict mechanical
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