|
|||||
|
|
| Evaluation of Strength Performance of Finger-jointed Lumbers Using Three Kinds of Nondestructive Techniques | |
| 引用本文： | LIN Lanying FU Feng Research Institute of Wood Industry,Chinese Academy of Forestry,Beijing 100091,China. Evaluation of Strength Performance of Finger-jointed Lumbers Using Three Kinds of Nondestructive Techniques[J]. 中国林业科技(英文版), 2007, 6(3): 17-25 |
| 作者姓名： | LIN Lanying FU Feng Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 China |
| 作者单位： | LIN Lanying FU Feng Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China |
| 基金项目： | This research is supported by ITTO Project PD 69/01 Rev.2(I) “Improved and diversified use of tropical plantation timber in China tosupplement diminishing supplies from natural forests”. |
| 摘 要： | Resonance flexural vibration（Fast Fourier Transform, FFT）, ultrasonic wave（Pundit） and stress wave（Metriguard） techniques were examined as means of evaluating the static modulus of elasticity （MOE） and predicting the modulus of rupture （MOR） of finger-jointed lumber specimens made with four kinds of Eucalyptus （Eucalyptus. citriodora, E. exserta, E. grandis x E. urophylla and E. grandis）. Dynamic MOE was calculated from frequency and time obtained from forced vibrations and sounds induced in the four species of finger-jointed specimens. It was found that correlation coefficients between density and static MOE and dynamic MOE were statistically significant at the 0.01 level. And it was also found that the three nondestructive techniques can provide rapid and accurate means to determine the MOE, and the dynamic MOE was more accurate to predict static MOE than density. But the correlation coefficient between dynamic MOE, static MOE and MOR were lower than results reported by other researchers for solid wood, and were not statistically significant. It can be concluded that the three nondestructive techniques are useful for evaluating the MOE, but not suitable for predicting the MOR of finger-jointed. |
| 关 键 词： | 非破坏性评估 强度性能 成材森林 林业建设 |
Evaluation of Strength Performance of Finger-jointed Lumbers Using Three Kinds of Nondestructive Techniques |
|
| LIN Lanying FU Feng. Evaluation of Strength Performance of Finger-jointed Lumbers Using Three Kinds of Nondestructive Techniques[J]. Chinese Forestry Science and Technology, 2007, 6(3): 17-25 | |
| Authors: | LIN Lanying FU Feng |
| Affiliation: | Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China |
| Abstract: | Resonance flexural vibration(Fast Fourier Transform, FFT), ultrasonic wave(Pundit) and stress wave(Metriguard) techniques were examined as means of evaluating the static modulus of elasticity (MOE) and predicting the modulus of rupture (MOR) of finger-jointed lumber specimens made with four kinds of Eucalyptus (Eucalyptus. citriodora, E. exserta, E. grandis x E. urophylla and E. grandis). Dynamic MOE was calculated from frequency and time obtained from forced vibrations and sounds induced in the four species of finger-jointed specimens. It was found that correlation coefficients between density and static MOE and dynamic MOE were statistically significant at the 0.01 level. And it was also found that the three nondestructive techniques can provide rapid and accurate means to determine the MOE, and the dynamic MOE was more accurate to predict static MOE than density. But the correlation coefficient between dynamic MOE, static MOE and MOR were lower than results reported by other researchers for solid wood, and were not statistically significant. It can be concluded that the three nondestructive techniques are useful for evaluating the MOE, but not suitable for predicting the MOR of finger-jointed. |
| Keywords: | nondestructive evaluation finger-jointed strength performance correlation coefficient |
| 本文献已被 CNKI 维普 等数据库收录！ | |