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Official Journal of the Japan Wood Research Society

Applicability of the losipescu shear test on the measurement of the shear properties of wood


We examined the applicability of the Iosipescu shear test for measuring the shear properties of wood. Quarter-sawn board of sitka spruce (Picea sitchensis Carr.) and shioji (Japanese ash,Fraxinus spaethiana Lingelsh. were used for the specimens. Iosipescu shear tests were conducted with two types of specimen whose longitudinal and radial directions coincided with the loading direction. The shear modulus, yield shear stress, and shear strength were obtained and were compared with those obtained by the torsion tests of rectangular bars. The results are summarized as follows: (1) The Iosipescu shear test is effective in measuring the shear modulus and the yield shear stress. (2) To measure the shear strength properly by the Iosipescu shear test, the configuration of specimen and the supporting condition should be examined in more in detail.


  1. Boonlualohr P, Valliappan S (1976) Elastoplastic torsion of anisotropic bars. Proc ASCE J Eng Mech Div 102:995–1008

    Google Scholar 

  2. Kon T (1948) On the law of variation of the modulus of elasticity for bending in wooden beams. Bull Hokkaido Univ Dept English 1:157–166

    Google Scholar 

  3. Yoshihara H, Ohta M (1997) Analysis of the shear stress/shear strain relationships in wood obtained by the torsion tests. Mokuzai Gakkaishi 47:457–463

    Google Scholar 

  4. Iosipescu N (1967) New accurate procedure for single shear testing of metals. J Mater 2:537–566

    Google Scholar 

  5. Janowiak JJ, Pellerin RF (1991) Iosipescu shear test apparatus applied to wood composites. Wood Fiber Sci 23:410–418

    Google Scholar 

  6. Adams DF, Walrath DE (1987) Current status of the Iosipescu shear test method. J Comp Mater 21:494–507

    CAS  Article  Google Scholar 

  7. Pierron F, Vaoutrin A (1994) Accurate comparative determination of the in-plane shear modulus of T300/914 by the Iosipescu and 45 degrees off-axis tests. Comp Sci Technol 52:61–72

    Article  Google Scholar 

  8. Kumosa M, Hull D (1987) Mixed-mode fracture of composites using Iosipescu shear test. Int J Fracture 35:83–102

    CAS  Article  Google Scholar 

  9. Conant NR, Odom EM (1995) An improved losipescu shear test fixture. J Comp Technol Res 17(1):50–55

    Article  Google Scholar 

  10. Yoshihara H, Ohta M (1997) Stress-strain relationship of wood in the plastic region. III. Determination of the yield stress by formulating the stress-plastic strain relationship. Mokuzai Gakkaishi 43:464–469

    CAS  Google Scholar 

  11. Yoshihara H, Ohta M (1996) Shear stress-shear strain relationship of wood in the plastic region. Mokuzai Gakkaishi 41:529–536

    Google Scholar 

  12. Timoshenko SP, Goodier JN (1970) Theory of elasticity (3rd ed). McGraw-Hill, New York, p 24

    Google Scholar 

  13. Forestry and Forest Products Research Institute (1975) 300 Kinds of useful timbers. Nihon Mokuzai Kakou Gijutsu Kyokai, Tokyo, pp 200–210

    Google Scholar 

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Correspondence to H. Yoshihara.

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Yoshihara, H., Ohsaki, H., Kubojima, Y. et al. Applicability of the losipescu shear test on the measurement of the shear properties of wood. J Wood Sci 45, 24–29 (1999).

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Key words

  • Iosipescu shear test
  • Shear modulus
  • Yield shear stress
  • Shear strength