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題名 | 徑向梯度特性對竹材機械及柔韌性質之影響=Effects of Radial Gradient Characteristics on the Mechanical Properties and Flexibility of Bamboo Materials |
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作者 | 楊登鈞; 楊欣諭; Yang, Teng-chun; Yang, Hsing-yu; |
期刊 | 林業研究季刊 |
出版日期 | 20170900 |
卷期 | 39:3 2017.09[民106.09] |
頁次 | 頁209-218 |
分類號 | 436.187 |
語文 | chi |
關鍵詞 | 桂竹; 孟宗竹; 彎矩應力; 曲率; 循環彎曲; 永久應變; Makino bamboo; Moso bamboo; Bending stress; Curvature; Cyclic bending; Permanent strain; |
中文摘要 | 本研究利用四點抗彎強度試驗及循環彎曲載重試驗,以評估徑向梯度特性對台灣桂竹與孟宗竹機械性質及柔韌性質之影響。試驗結果得知,在抗彎性質方面,桂竹OC試片(Outer in compression,OC)最大彎矩應力約為227.2 MPa,此值高於OT試片(Outer in tension,OT)的199.1 MPa。而OT試片抗彎強度下之曲率值((1/r)_(max))為16.8 m^(-1),此值高於OC試片之11.0 m^(-1)。該結果顯示OT試片顯示高延展性,而OC試片則顯示高最大彎矩應力。然而,孟宗竹OC試片最大彎曲值與OT試片於統計上無顯著的差異。對於彈性模數方面,無論OT試片與OC試片,桂竹與孟宗竹之彈性模數分別約20 GPa與15 GPa,此結果顯示試片承載方向對於彈性模數無顯著的影響。而有關抗循環彎曲載重性質方面,桂竹OT試片之全循環次數的最大彎矩應力((σ_(max))_c),其(σ_(max))_c保留率比OC試片高。此外,桂竹OT試片相較OC試片表現低永久應變值,此結果顯示OT試片具有高抗循環彎曲性質。而孟宗竹方面,與桂竹呈現相似的趨勢,顯示OT試片相較OC試片具有高抗循環彎曲性質。 |
英文摘要 | In this study, effects of radial gradient characteristics on the mechanical properties and flexibility of Makino bamboo (Phyllostachys makinoi) and Moso bamboo (Phyllostachys edulis) were estimated by using 4-point bending test and cyclic bending test. In flexural properties, the maximum bending stress (σ_(max)) of the outer of Makino bamboo in compression (OC_(ma)) showed 227.2 MPa, which was higher than its outer in tension (OT_(ma)). The maximum curvature value ((1/r)_(max)) in OT_(ma) was 16.8 m^(-1), which was higher than one in OC_(ma) (11.0 m^(-1)). These results indicated that the OT_(ma) exhibited higher ductility, while the OC_(ma) showed higher bending stress. However, the outer in compression and tension of Moso (OT_(mo) and OC_(mo)) showed no significant difference for their flexural properties. Additionally, regardless of OT and OC, the elastic modulus for Makino and Moso bamboo exhibited 20 GPa and 15 GPa, respectively. The result illustrated that the elastic modulus was not influenced by the loading orientation on the specimen. Furthermore, according to the (σ_(max))_c that is σ_(max) at the whole cycle number after cyclic 4-point bending test, its retention ratio for OT_(ma) exhibited higher than the OC_(ma). On the other hands, the OT_(ma) exhibited lower permanent strain with compared to the OC_(ma), indicating that the OT_(ma) was higher cyclic bending resistance. As for Moso bamboo, the (σ_(max))_c retention ratio showed the same tendency with Makino bamboo, indicating that the cyclic bending resistance for OT_(mo) was superior to that for OC_(mo). |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。