Failure Behavior of Spruce Wood under Bending-Shear Combined Stress Field
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 1
Abstract
When a specimen with symmetrical grooves eccentrically cut on its side surfaces is bent, failure due to the bending-shear combined stress field is induced at the grooved portion, so the failure behavior under various combined stress fields can be examined by varying the location of the grooves. Based on this concept, three-point and asymmetric four-point bending tests using spruce specimens with grooves cut on various locations on the side surfaces were conducted. Bending and shear stresses at the occurrence of failure were calculated based on elementary beam theory, and the test results were compared with three failure conditions: maximum stress, Hill-type, and Goldenblat–Kopnov’s failure conditions. For a rough approximation of the failure behavior, which might be influenced by the loading pattern, the Hill-type condition was superior to the maximum stress condition, whereas Goldenblat–Kopnov’s condition, the expression of which is more complicated, is effective for describing the failure behavior more precisely.
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References
Cowin, S. C. (1979). “On the strength anisotropy of bone and wood.” Trans. ASME, Series E, J. Appl. Mech., 46, 832–838.
Goldenblat, I., and Kopnov, V. A. (1966). “Strength of glass-reinforced plastics in the complex stress state.” Polym. Mech., 1, 54–59.
Hill, R. (1948). “A theory of the yielding and plastic flow of anisotropic metals.” Proc. R. Soc. London, Ser. A, 193, 281–297.
Jenkin, C. F. (1920). “Strength in directions inclined to the grain.” Report on materials of construction used in aircraft and aircraft engines, His Majesty’s Stationery Office, London, 102–104.
Kobetz, R. W., and Krueger, G. P. (1976). “Ultimate strength design of reinforced timber-biaxial stress failure criteria.” Wood Sci., 8, 252–261.
Liu, J. Y. (1984). “Evaluation of the tensor polynomial strength theory for wood.” J. Compos. Mater., 18, 216–226.
Liu, J. Y. (2000). “Effects of shear coupling on shear properties of wood.” Wood Fiber Sci., 32(4), 458–465.
Liu, J. Y. (2002). “Analysis of off-axis tension test of wood specimens.” Wood Fiber Sci., 34(2), 205–211.
Nahas, M. N. (1988). “Survey of failure and post-failure theories of laminated fiber-reinforced composites.” J. Compos. Technol. Res., 8, 138–153.
Origuchi, K., Yoshihara, H., and Ohta, M. (1997). “Yield behavior of wood under compression-shear combined stress condition.” J. Soc. Mater. Sci. Jpn., 46(4), 385–389.
Xavier, J. C., Garrido, N. M., Oliveira, M., Morais, J. L., Camanho, P. P., and Pierron, F. (2004). “A comparison between the Iosipescu and off-axis shear test methods for the characterization of Pinus Pinaster Ait.” Composites, Part A, 35(7–8), 827–840.
Yamasaki, M., Sasaki, Y., and Ando, K. (1999). “Mechanical properties of wood under combined axial force and torque.” Mokuzai Gakkaishi, 45(4), 297–305.
Yoshihara, H., Ohsaki, H., Kubojima, Y., and Ohta, M. (2001). “Comparisons of shear stress/shear strain relations of wood obtained by Iosipescu and torsion tests.” Wood Fiber Sci., 33(2), 275–283.
Yoshihara, H., and Ohta, M. (1991). “A failure criterion which enables the prediction of the failing direction for orthotropic materials.” Mokuzai Gakkaishi, 37(6), 511–516.
Yoshihara, H., and Ohta, M. (2000). “Estimation of the shear strength of wood by uniaxial-tension tests of off-axis specimens.” J. Wood Sci., 46, 159–163.
Yoshihara, H., Sasaki, K., and Ohta, M., (1996). “Determination of wood in a biaxial-stress state. I: Examination of the biaxial-compression testing method.” Mokuzai Gakkaishi, 42(4), 327–332.
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© 2006 ASCE.
History
Received: Oct 5, 2004
Accepted: Apr 4, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
Notes
Note. Associate Editor: Roberto Lopez-Anido
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