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國立臺灣大學生物資源暨農學院實驗林研究報告
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| 篇名 | 利用機械分等設備評估三種相同強度等級針葉材及進料方向之機械性質 |
|---|---|
| 卷期 | 38:1 |
| 並列篇名 | Evaluation of Mechanical Properties of the Three Coniferous Wood Species with Identical Strength Grades and Feeding Orientations Using Machine Stress Rating Equipment |
| 作者 | 李佳如 、 莊閔傑 、 林志憲 、 李東穎 、 蔡明哲 |
| 頁次 | 023-032 |
| 關鍵字 | 國產材 、 杉木 、 柳杉 、 臺灣杉 、 機械應力分等 、 Domestic Timber 、 Cunninghamia lanceolata 、 Cryptomeria japonica 、 Taiwania cryptomerioides 、 Machine Stress Rating |
| 出刊日期 | 202403 |
| DOI | 10.6542/EFNTU.202403_38(1).0003 |
中文摘要
本研究利用機械應力分等（Machine stress rating，MSR）先將杉木（Cunninghamia lanceolata）、柳杉（Cryptomeria japonica）及臺灣杉（Taiwania cryptomerioides）進行應力分等，將相同應力等級的試材進行強度性質的分析，同時比較進料板面方向對抗彎性質之影響，並評估靜態和連續式抗彎試驗之相關性。由抗彎性質試驗結果顯示三種木材經MSR測得抗彎彈性模數（Modulus of elasticity MOE_(MSR)）值均為相同等級之下，得知萬能強度試驗機測得的MOE_(Bending)值較MSR測得的值為低。由抗彎強度（Modulus of rupture，MOR）、剪力強度及抗壓強度值均顯示柳杉＞臺灣杉＞杉木，其主要是受到樹種及密度影響，由應力應變曲線顯示三種試材均具有初始滑移的情形，由斜率可得知柳杉材料抗彎彈性最大，具有最高的比例限度表現，依序為杉木及臺灣杉。進料板面方向方面，木表面向下方向對於同樹種之間的MOE_(MSR)、MOE_(100 kN)及MOE_(5 kN)值並無顯著性差異（p > 0.05），然而柳杉的MOE值則是顯著性的大於杉木及臺灣杉（p < 0.05）。
英文摘要
In this study, machine stress rating (MSR) was used to assess the stress levels of Cunninghamia lanceolata, Cryptomeria japonica, and Taiwania cryptomerioides. The strength properties of the specimens with identical stress levels were analyzed, and simultaneously, the influence of the feeding orientation on bending properties was examined. Additionally, the correlation between static and continuous bending tests was evaluated. The results of the bending properties indicate that the modulus of elasticity (MOE_(MSR)) values for all three timber types, as measured by MSR, fall within the same grade. Furthermore, the MOE_(Bending) value obtained from the universal strength testing machine was observed to be overestimated compared to the value derived from MSR measurements. Analysis of Modulus of rupture (MOR), shear strength, and compression strength revealed a ranking of C. japonica > T. cryptomerioides > C. Ianceolata, indicating a significant influence of tree species and density on these properties. The stress-strain curve illustrates an initial slip for all three specimens, with the slope showing that C. japonica exhibits the highest elasticity and proportional limit performance, followed by C. lanceolata and T. cryptomerioides. Considering the feeding board orientation, no significant differences were observed in MOE_(MSR), MOE_(100 kN) and MOE_(5 kN) within the same species (p > 0.05). However, the MOE value of C. japonica was significantly higher than that of C. lanceolata and T. cryptomerioides (p < 0.05).