Measurement of the Timoshenko Shear Stiffness. II: Effect of Transverse Compressibility
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Volume 11, Issue 3
Abstract
This is the second of two papers devoted to the issue of measuring the Timoshenko shear stiffness of thin-walled composite beams. In the first paper, the effect of warping on the effective Timoshenko shear stiffness, as measured through bending tests, was studied. The bending test was simulated using finite-element analysis, and the results indicated that the warping effect was minimal. On the other hand, the evidence suggests that transverse flexibility may have a significant influence on the effective Timoshenko shear stiffness, decreasing the effective shear stiffness at shorter test spans. The purpose of the present study is to further investigate this effect and to explore the use of a sandwich theory to predict the measurement error. A higher-order sandwich theory, which captures the transverse strain at concentrated loads and supports, is applied to a commercially available thin-walled composite beam. The results indicate that the sandwich model does capture the decrease in the effective shear stiffness at short spans, and the dependence of the shear stiffness on span-to-depth ratio is similar to that calculated in the first paper, using the finite-element method.
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References
Allen, H. G. (1969). Analysis and design of structural sandwich panels, Pergamon, Oxford.
Barbero, E. J., Lopez-Anido, R., and Davalos, J. F. (1993). “On the mechanics of thin-walled laminated composite beams.” J. Compos. Mater., 27(8), 806–29.
Dufort, L., Grediac, M., and Surrel, Y. (2001). “Experimental evidence of the cross-section warping in short composite beams under three point bending.” Compos. Struct., 51(1), 37–47.
Frostig, Y., and Baruch, M. (1996). “Localized load effects in high-order bending of sandwich panels with flexible core.” J. Eng. Mech., 122(11), 1069–1076.
Frostig, Y., Baruch, M., Vilnay, O., and Sheinman, I. (1992). “High-order theory for sandwich-beam behavior with transversely flexible core.” J. Eng. Mech., 118(5), 1026–1043.
Frostig, Y., and Shenhar, Y. (1995). “High-order bending of sandwich beams with a transversely flexible core and unsymmetrical laminated composite skins.” Composites Eng., 5(4), 405–414.
Hayes, M. D. (2003). “Structural analysis of a pultruded composite beam: shear stiffness determination and strength and fatigue life predictions.” Ph.D. dissertation, Virginia Polytechnic Institute and State Univ., Blacksburg, Va.
Hayes, M. D., and Lesko, J. J. (2007). “Measurement of the Timoshenko shear stiffness I. Effect of warping.” J. Compos. Constr., 11(3), 336–342.
Langhaar, H. L. (1962). Energy methods in applied mechanics, Wiley, Malbar, Fla.
Ming, X., and Adams, D. F. (1995). “Contact finite-element modeling of the short beam shear test for composite materials.” Comput. Struct., 57(2), 183–191.
Plantema, F. J. (1966). Sandwich construction: The bending and buckling of sandwich beams, plates, and shells, Wiley, New York.
Roberts, T. M., and Masri, H. M. K. J. A. H. (2003). “Section properties and buckling behavior of pultruded FRP profiles.” J. Reinf. Plast. Compos., 22(4), 1305–1317.
Schniepp, T. J. (2002). “Design manual development for a hybrid, FRP double-web beam, and characterization of shear stiffness in FRP composite beams.” Master’s thesis, Virginia Polytechnic Institute and State Univ., Blacksburg, Va.
Strongwell. (2000). EXTREN DWB design guide, Bristol, Va.
Swanson, S. R. (1999). “An examination of a higher order theory for sandwich beams.” Compos. Struct., 44(2–3), 169–77.
Swanson, S. R. (2000). “Response of orthotropic sandwich plates to concentrated loading.” J. Sandwich Struct. Mater., 2, 270–287.
Swanson, S. R., and Kim, J. (2000). “Comparison of a higher order theory for sandwich beams with finite-element and elasticity analyses.” J. Sandwich Struct. Mater., 2, 33–49.
Whitney, J. M. (1985). “Elasticity analysis of orthotropic beams under concentrated loads.” Compos. Sci. Technol., 22, 167–184.
Yoshida, H., Ogasa, T., and Uemura, M. (1991). “Local stress distribution in the vicinity of loading points in flexural test of orthotropic beams.” J. Energy Resour. Technol., 113, 230–234.
Zenkert, D. (1995). An introduction to sandwich construction, Cradley Heath Publishers, West Midlands, England, U.K.
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© 2007 ASCE.
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Received: Jul 11, 2005
Accepted: May 16, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
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