Skip to main content

Advertisement

Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Dynamic modulus of elasticity and bending properties of large beams of Taiwan-grown Japanese cedar from different plantation spacing sites

Article metrics

  • 288 Accesses

  • 33 Citations

Abstract

The effect of plantation spacings (types A-E) on the bending strength and dynamic modulus of elasticity of 41-year-old Taiwan-grown cedar (Cryptomeria japonica D. Don) was investigated. The results indicate that the highest values for the static bending modulus of elasticity (MOE), modulus of rupture (MOR), and dynamic modulus of elasticity (EDℓ, E Dt) occurred in trees obtained from those most densely planted (type A); there was a significant difference between type A and the other four spacing types (B, C, D, and E), but there were no significant differences among those four types. Interrelations among MOE, MOR, E Dℓ, and E Dt could be represented by positive linear regression formulas, which revealed highly significant differences. The relations among the square value of stress-wave transmission velocity (Vt 2 and Vt 2) and MOE, MOR, E Dl, and E Dt, respectively, could be represented by positive linear regression formulas. The differences were highly significant.

References

  1. 1.

    Wang SY, Chen KN (1992) Effects of plantation spacings on tracheid lengths, annual-ring widths, and percentages of latewood and heartwood of Taiwan-grown Japanese cedar. Mokuzai Gakkaishi 38:645–656

  2. 2.

    Wang SY, Lin FC (1994) Effects of plantation spacing on density, and mechanical properties of Japanese cedar grown in Taiwan (in Chinese). Mem Coll Agric Nat Taiwan Univ 34(2):124–152

  3. 3.

    Wang SY, Lin SH (1996) Effects of plantation spacings on the quality of visually graded lumber and mechanical properties of Taiwan-grown Japanese cedar. Mokuzai Gakkaishi 42:435–444

  4. 4.

    Wang SY (1990) The sawing method and rate in lumber manufacturing (in Chinese). Forest Prod Ind 9(2):131–141

  5. 5.

    Nanami N, Nakamura N, Arima T, Okuma M (1992) Measuring the properties of standing trees with stress waves. I. The method of measurement and the propagation path of the waves (in Japanese). Mokuzai Gakkaishi 38:739–746

  6. 6.

    Gerhards CC (1978) Effects of earlywood and latewood on stress-wave measurements parallel to the grain. Wood Sci 11(2):69–72

  7. 7.

    Kubo T, Jyodo S (1996) Some characteristics of the annual ring structure related to wood density variation in Sugi (Cryptomeria japonica). Mokuzai Gakkaishi 42:1156–1162

  8. 8.

    Sumiya K, Shimaji K, Itoh T, Kuroda H (1982) A consideration on some physical properties of Japanese cedar (Cryptomeria japonica D. Don) and Japanese cypress (Chaniaecyparis obtusa S. and Z.) planted at different densities (in Japanese). Mokuzai Gakkaishi 28:256–259

  9. 9.

    Zobel BJ (1989) Wood variation and its causes and control. Springer, Berlin Heidelberg New York pp 231–241

  10. 10.

    Matsumoto T (1962) Studies on the dynamic modulus of elasticity of wood-the elasticity modulus and logarithmic decrement induced by flexural vibrations (in Japanese). Bull Exp Forest Kyushu Univ 36:1–86

  11. 11.

    Lin CR, Shih, NY, Wang SY (1992) Studies on the lumber grades and bending properties of Japanese cedar and China fir plantation trees (in Chinese). Q J Exp Forest NTU 6(1):71–101

  12. 12.

    Wang YR, Chen, BJ (1990) Study on the in-grade variance of dimension lumber strength distribution (in Chinese). Forest Prod Ind 9(2):97–109

  13. 13.

    Sato T (1955) Research of sugi (in Japanese). Yokendo, Tokyo pp 34

  14. 14.

    Chow C (1990) The non-destructive and destructive tests of China-fir as a structural member (in Chinese). Forest Prod Ind 9(4):39–50

  15. 15.

    Resch H, Bastendorff K (1978) Some wood properties of plantation pines, Pinus caribaea and Pinus oocarpa. Wood Fiber 10:210–217

  16. 16.

    Pearson RG, Ross BE (1984) Growth rate and bending properties of selected loblolly pine. Wood Fiber Sci 16(1):37–47

  17. 17.

    Wang SY (1986) Studies on the dynamic and acoustic behaviors of wood. II. Studies on the dynamic modulus of elasticity and internal friction of wood (in Chinese). Mem Coll Agric Nat Taiwan Univ 25(1):51–76

  18. 18.

    Huang YS, Hsiung TC, Chen SS (1990) The feasibility of FFT spectrum analysis by tap tone as applied to the quality evaluation of wood (in Chinese). Forest Prod Ind 9(1):43–54

  19. 19.

    Nanami N, Nakamura N, Arima T, Okuma M (1992) Measuring the properties of standing trees with stress waves. II. Application of the method to standing trees (in Japanese). Mokuzai Gakkaishi 38:747–752

  20. 20.

    Nanami N, Nakamura N, Arima T, Okuma M (1993) Measuring the properties of standing trees with stress waves. III. Evaluating the properties of standing trees for some forest stands (in Japanese). Mokuzai Gakkaishi 39:903–909

  21. 21.

    Chen CY (1989) Elasticity modulus of particleboards measurement by non-destructive test method (in Chinese). J Agric Forestry NCHO 38:151–164

  22. 22.

    Tanaka T (1988) Evaluation of strength by non-destructive testapplication for sugi wood attacked by borer-insect (in Japanese). Wood Ind 43(2):20–25

  23. 23.

    Sandoz JL (1989) Grading of construction timber by ultrasound. Wood Sci Technol 23:95–108

Download references

Author information

Additional information

Part of this report was presented at the International Wood Engineering Conference '96, New Orleans, LA, USA, October 1996

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Wang, S., Ko, C. Dynamic modulus of elasticity and bending properties of large beams of Taiwan-grown Japanese cedar from different plantation spacing sites. J Wood Sci 44, 62–68 (1998) doi:10.1007/BF00521876

Download citation

Key words

  • Japanese cedar
  • Plantation spacing
  • Stress wave
  • Bending strength
  • Dynamic modulus of elasticity