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Research Papers

A Damage Model for Adhesively Bonded Single-Lap Thick Composite Joints

[+] Author and Article Information
Sayed A. Nassar, Jianghui Mao, Xianjie Yang

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

Douglas Templeton

US Army TARDEC, Warren, MI 48397

J. Eng. Mater. Technol 134(4), 041004 (Aug 24, 2012) (7 pages) doi:10.1115/1.4006821 History: Received June 13, 2011; Revised April 19, 2012; Published August 24, 2012; Online August 24, 2012

A proposed damage model is used for investigating the deformation and interfacial failure behavior of an adhesively bonded single-lap thick joint made of S2 glass/SC-15 epoxy resin composite material. The bonding material is 3M Scotch-Weld Epoxy Adhesive DP405 Black. Continuum damage mechanics models are used to describe the damage initiation and final failure at or near the interface. The effect of adhesive overlap length, thickness, and plasticity on the interfacial shear and normal stresses is studied. Experimental and analytical data are used to validate the proposed damage models.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Adhesive bonded single-lap joint

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Figure 2

Macroresponse of the adhesively bonded joint (adhesive thickness 0.08 in., and adhesive overlap length 2.5 in.)

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Figure 3

Average shear strength versus adhesive thickness (standard deviation 0.75 MPa)

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Figure 4

Average shear strength versus adhesive overlap length (standard deviation 1.4 MPa)

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Figure 5

Comparison of joint failure mode: experimental versus FEA simulation (L = 63.5 mm, T = 2.03 mm)

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Figure 6

Normal stress S11 distribution for various overlap lengths

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Figure 7

Normal stress S22 distribution for various overlap lengths

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Figure 8

Shear stress S12 distribution for various overlap lengths

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Figure 9

Normal stress S11 distribution for various adhesive thicknesses

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Figure 10

Normal stress S22 distribution for various adhesive thicknesses

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Figure 11

Shear stress S12 distribution for various adhesive thicknesses

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Figure 12

Normal stress S11 distribution for various loading conditions

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Figure 14

Shear stress S12 distribution for various loading conditions

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Figure 13

Normal stress S22 distribution for various loading conditions

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