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Research Papers: JOINING

Effect of Adhesive Nanoparticle Enrichment on Static Load Transfer Capacity and Failure Mode of Bonded Steel–Magnesium Single Lap Joints

[+] Author and Article Information
Sayed A. Nassar

Fellow ASME
Fastening and Joining Research Institute (FAJRI),
Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

Zhijun Wu, Kassem Moustafa, Demetrios Tzelepis

Fastening and Joining Research Institute (FAJRI),
Department of Mechanical Engineering,
Oakland University,
Rochester, MI 48309

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received December 5, 2014; final manuscript received March 11, 2015; published online September 4, 2015. Assoc. Editor: Jingjing Li.

J. Manuf. Sci. Eng 137(5), 051024 (Sep 04, 2015) (6 pages) Paper No: MANU-14-1657; doi: 10.1115/1.4030081 History: Received December 05, 2014

An experimental procedure and test setup are used for investigating effect of using nanoparticle additives to the adhesive on the load transfer capacity (LTC) of bonded magnesium (Mg)–steel (St) single lap joints (SLJ). Investigated variables include the nanopowder material (alumina versus silica), particulate size (20 nm versus 80 nm), and concentration in the adhesive (2.5 wt.% versus 5.0 wt.%). Two different levels of surface roughness on the bonded area are used, namely, sanding the bond area with G60 or G180 sand paper. Test data and scanning electron microscopy (SEM) failure mode analysis are provided.

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Figures

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Fig. 1

ASTM D1002 sample dimensions (not to scale)

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Fig. 2

Effect of nanopowder material types with surface preparation of grit 180 (①—2.5 wt.%, 20 nm; ②—2.5 wt.%, 80 nm; ③—5.0 wt.%, 20 nm; and ④—5.0 wt.%, 80 nm)

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Fig. 3

Effect of nanopowder material types with surface preparation of grit 60 (①—2.5 wt.%, 20 nm; ②—2.5 wt.%, 80 nm; ③—5.0 wt.%, 20 nm; and ④—5.0 wt.%, 80 nm)

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Fig. 4

Effect of nanopowder wt.% concentration on LTC

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Fig. 5

Effect of nanopowder particulate size on LTC

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Fig. 6

Effect of surface preparation on LTC

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Fig. 7

SEM photograph of the interface layer for the 2.5 wt.% silica, 20 nm particulate size, and 180 grit surface preparation. The failure mode was adhesion at the boundary layer of the steel substrate.

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Fig. 8

EDS X-ray dot map showing the iron clusters at the adhesive interface

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Fig. 9

SEM photograph of the interface layer for the 5.0 wt.% alumina, 20 nm particulate size, and 180 grit surface preparation. The failure mode was adhesion at the boundary layer of the steel substrate.

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Fig. 10

EDS X-ray dot map showing the iron clusters at the adhesive interface

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