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TECHNICAL PAPERS

Assessment of Sandwich Beam in Three-Point Bending for Measuring Adhesive Shear Modulus

[+] Author and Article Information
Jianmei He, Martin Y. M. Chiang, Donald L. Hunston

Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899

J. Eng. Mater. Technol 123(3), 322-328 (Mar 15, 2001) (7 pages) doi:10.1115/1.1375159 History: Received October 31, 2000; Revised March 15, 2001
Copyright © 2001 by ASME
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References

Figures

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The 3-point bending sandwich beam, the gray adhesive layer between two adherends
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The model of FEA for the 3-point bending sandwich beam (L=2l)
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The stiffness of the sandwich beam KFEA obtained from the FEA
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The variation of the total stiffness and bending stiffness with respect to adhesive shear modulus
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Comparison of the analytical stiffness based on Eq. (1), Ks1, to the stiffness KFEA from FEA
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Comparison of the analytical stiffness based on Eq. (4), Ks2, to the stiffness KFEA from FEA
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Beam stiffness from finite element analysis, KFEA, as a function of adhesive shear modulus, Ga, for samples with 2 different span lengths, L
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Comparison of the analytical stiffness based on Eq. (4), Ks2, to the stiffness (KFEA) from FEA under different aspect ratio L/h
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The uncertainty analysis results based on Eq. (4)
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The comparison of results between debonding and no-debonding with respect to adhesive shear modulus Ga (h/t=6.68,a/l=0.1, a: crack length)
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The comparison of results between debonding and no-debonding with respect to adhesive shear modulus Ga (h/t=0.783,a/l=0.1, a: crack length)
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The comparison of results between debonding and no-debonding with respect to the length of debonds (Ga=1.06 GPa)

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