期刊
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
卷 51, 期 -, 页码 42-53出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2014.02.010
关键词
Adhesive-bonded joint; Mechanical behavior; Dissimilar steels; Lap-shear; Coach-peel; Fracture
资金
- Lingchen Ma and Xiaowei Zhang of Tsingua University
The hybrid steel materials (e.g., advanced high strength steels combined with mild steels) have been increasingly applied in vehicle components to achieve the compromise among mechanical performance, lightweight and material cost. A significant issue related to the bonding of dissimilar steel materials is that the differences in substrate physical properties often lead to bond separation at strength levels far less than the bond strength established by the adhesive manufacturer for the joint with similar substrates. This research studied several important factors influencing the strengths of adhesive-bonded lap shear (LS) and coach-peel (CP) joints. Four types of steel substrates were used to fabricate the unbalanced adhesive joints (dissimilar steels or same steels with different thicknesses). The quasi-static tensile tests of the unbalanced joints were performed. A finite-element model was proposed to characterize the fracture behavior of joints. The effects of substrate properties such as bending stiffness and load-carrying capability of substrates on the joint strength (peak force) and fracture modes were investigated. It was observed that the interfacial fracture is prone to occur on the substrate with the relatively weak yield strength. A cohesive fracture can be produced when the load-carrying capabilities of the two substrates are similar. In order to optimize the load-carrying capability of the unbalanced joint, a design guideline was put forward. (C) 2014 Elsevier Ltd. All rights reserved.
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