針葉樹年輪特徵值與木材抗壓強度相關性之研究

Abstract

本研究選用台灣杉（Taiwania cryptomerioides，Taiwania）、杉木（Cunninghamia lanceolata，China fir）、柳杉（Cryptomeria japonica，Japanese fir）、鐡杉（Tusga chinensis，Chinese hemlock）、香杉（Cunninghamia konishii，Luanta fir）、紅檜（Chamaecyparis formosensis，Taiwan red cypress）及肖楠（Calocedrus formosana，Taiwan incense cedar）等七種常見針葉樹種為試驗材料。利用QMS年輪分析儀進行年輪特徵值檢測，以及超音波非破壞檢測試材之音速，探討年輪特徵值、試材音速與木材力學性質（DMOE及MOR）三者之間的關聯性。

This research selected seven wood species of afforestation for the specimens, such as Taiwania ( Taiwania cryptomerioides), China fir (Cunninghamia lanceolata), Japanese fir (Cryptomeria japonica), Chinese hemlock ( Tusga chinensis), Luanta fir ( Cunninghamia konishii), Taiwan red cypress ( Chamaecyparis formosensis), Taiwan incense cedar ( Calocedrus formosana) to carry through all the experiments. The ring characteristics measured by QMS Tree Ring Analyzer and the ultrasonic velocity measured by ultrasonic-wave method investigated into the relationship between ring characteristics, ultrasonic velocity and mechanical properties (DMOE and MOR). The results showed that there was no difference on density between each type of specimens, but the values of ultrasonic velocity, DMOE and MOR were all in the same trend, longitudinal＞radial＞tangential＞45 degree. In addition, influence upon each other among density, ultrasonic velocity, DMOE and MOR. Among them, the mutuality between density and MOR was significant, and the relationship between DMOE and MOR was greater than ultrasonic velocity and MOR. Evaluating the influence of ultrasonic velocity on ultrasonic wave direction could be aware that ultrasonic velocity in longitudinal specimens is the fastest, and then is ultrasonic velocity in radial specimens (VR), ultrasonic velocity in tangential specimens (VT) in order, it showed that the ultrasonic velocity was influenced by the permutation of timber cells.