A finite element analysis (FEA) was conducted to examine the feasibility of determining the shear modulus of an adhesive in a bonded geometry using a three-point bending test on a sandwich beam specimen. The FEA results were compared with the predictions from two analytical solutions for the geometry used to determine the impact of the assumptions that were made in these analyses. The analytical results showed significantly different to the values obtained from other experiments on bulk samples of the adhesive in the glassy region. Although there were some agreements in rubbery region, the negligible sensitivity of the beam stiffness to the presence of adhesive layer makes the agreements very questionable. To examine the possible explanations for these differences in glassy adhesives, sensitivity analysis was conducted to explore the effects of experimental variables. Some possible reasons for the differences are discussed, but none of these reasons taken alone satisfactorily account for the discrepancies. Until an explanation is found, the three-point bending test using a sandwich beam specimen to determine the adhesive shear modulus might not be a desirable test method, at least for the range of geometry examined in this study.
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July 2001
Technical Papers
Assessment of Sandwich Beam in Three-Point Bending for Measuring Adhesive Shear Modulus
Jianmei He,
Jianmei He
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Martin Y. M. Chiang,
Martin Y. M. Chiang
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Donald L. Hunston
Donald L. Hunston
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Search for other works by this author on:
Jianmei He
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Martin Y. M. Chiang
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Donald L. Hunston
Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division October 31, 2000; revised manuscript received March 15, 2001. Associate Editor: S. Mall.
J. Eng. Mater. Technol. Jul 2001, 123(3): 322-328 (7 pages)
Published Online: March 15, 2001
Article history
Received:
October 31, 2000
Revised:
March 15, 2001
Citation
He , J., Chiang , M. Y. M., and Hunston, D. L. (March 15, 2001). "Assessment of Sandwich Beam in Three-Point Bending for Measuring Adhesive Shear Modulus ." ASME. J. Eng. Mater. Technol. July 2001; 123(3): 322–328. https://doi.org/10.1115/1.1375159
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