Dynamic modulus of elasticity and bending properties of large beams of Taiwan-grown Japanese cedar from different plantation spacing sites |
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| Authors: | Song-Yung Wang Chih-Yu Ko |
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| Institution: | (1) Department of Forestry, College of Agriculture, National Taiwan University, No. 1 Sec. 4 Roosevelt Road, Taipei, Taiwan, ROC |
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| 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 (ED , 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
D, 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.Part of this report was presented at the International Wood Engineering Conference '96, New Orleans, LA, USA, October 1996 |
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| Keywords: | Japanese cedar Plantation spacing Stress wave Bending strength Dynamic modulus of elasticity |
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