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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image
  • Note
  • Open Access

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

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Journal of Wood ScienceOfficial Journal of the Japan Wood Research Society199844:BF00521876

https://doi.org/10.1007/BF00521876

  • Received: 10 January 1997
  • Accepted: 12 August 1997
  • Published:

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.

Key words

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

Notes

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