木材衝擊抗彎強度之研究

Studies on Impact Bending Strength of Woods

黃彥三(Yan-San Huang)

《林業試驗所研究報告季刊》 2卷2期 (1987/06) Pp. 145-154

https://doi.org/10.7075/BTFRI.198706.0145

摘要

本試驗就12種針闊葉樹材進行衝擊抗彎試驗在Amsler衝擊試驗機之擺錘上設置加速度計，試驗時經由加速度之測定，利用物理擺錘打擊原理，計算衝擊荷重，藉以推算衝擊破壞係數。同時經由荷重－時間曲綫之積分求出衝量進而推算吸收能量，並與由試驗機讀得之吸收能量作比較，主要結果如下：
1.衝擊抗彎強度平均較靜曲抗彎強度大33%。
2.衝擊抗彎強度有隨樹種靭性之增大而增大之趨勢。
3.衝擊抗彎強度隨試片細長比之增加而增大。
4.衝擊吸收能量隨試片斷面之增大而增加，但以單位斷面積表示時，則有一致化之趨勢。

關鍵字

衝擊抗彎強度

並列摘要

12 kinds of wood were used for impact bending test. An accelerometer was attached to the pendulum of the Amsler impact testing machine so that the impact force during test could be measured and the impact modulus of rupture could be calculated. Using the impulse calculated by integrating the impact force-time curve, energy absorbed can be obtained theoretically, which can be compared with the reading of impact testing machine. The results were as follows.
1. The impact bending strength was 33% higher than the static bending strength on the average.
2. The impact bending strength of woods increased with the increase of toughness.
3. The impact bending strength increased with the increase of the span-depth ratio of specimen.
4. The impact absorbed energy was increased with the increase of the cross section of specimen, but this value was equalized when it was expressed in unit cross section area.

並列關鍵字

Impact bending strength