https://scholars.lib.ntu.edu.tw/handle/123456789/629878
標題: | Evaluation of the Strength Characteristics of Cunninghamia lanceolata Timber Using Continuous Mechanical Stress Rating Equipment | 作者: | Lee, C Lin, C Chung, M MING-JER TSAI |
關鍵字: | Cunninghamia lanceolata; Nondestructive testing; Machine stress rated grading; Continuous mechanical stress rating equipment; BENDING PROPERTIES; WOOD; STIFFNESS; PINE | 公開日期: | 2022 | 出版社: | NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI | 卷: | 17 | 期: | 1 | 起(迄)頁: | 1411 | 來源出版物: | BIORESOURCES | 摘要: | Before timber is used for engineering and structural purposes, it is necessary to grade the strength of the timber. In order to obtain the static modulus of elasticity value of timber quickly and accurately, this study used ultrasonic waves and continuous mechanical stress rating equipment and two non-destructive test methods to analyze the correlation between the non-destructive test measured value and the static modulus of elasticity value. It also evaluated the influence of the feeding orientation of the boards, the forward and reverse feed directions, feeding speed, and break area ratio. The analysis results indicated that the modulus of elasticity value determined through continuous mechanical stress rating equipment had the highest correlation with the static modulus of elasticity value. Moreover, according to the results, the feeding orientation of the boards, the forward and reverse feed directions, and the feeding speed did not influence the prediction of the continuous mechanical stress rating equipment modulus of elasticity value. Meanwhile, to ensure the accuracy and uniformity of the continuous mechanical stress rating equipment modulus of elasticity detection value, it is necessary to avoid an excessively high break area ratio in Cunninghamia lanceolata timber during the preparation process. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/629878 | ISSN: | 1930-2126 | DOI: | 10.15376/biores.17.1.1411-1426 |
顯示於: | 森林環境暨資源學系 |
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