Experiments with rings to determine the anisotropic elastic constants of bamboo

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• 作者：José ; Jaime Garcí ; a^a ; ^{josejgar@gmail.com} ; Christian Rangel^a ; Khosrow Ghavami^b
• 关键词：Bamboo Guadua angustifolia ; Bamboo anisotropy ; Elastic constants ; Mechanical properties
• 刊名：Construction and Building Materials
• 出版年：2012
• 期刊代码：42_09500618
• 类别：et
• 出版时间：June, 2012
• 卷：31
• 期：Complete
• 页码：52-57
• 文件大小：1010 K

摘要

Different species of bamboo are extensively used to build houses and temporary structures in developing countries. Few studies have been carried out to establish the elastic constants along the transverse axes which are the weakest directions, making them prone to failure. This is mainly due to the difficulty to cut specimens long enough to accomplish correct circumferential or radial uniaxial tests. A simple test protocol is proposed in this study to determine the radial-circumferential Poisson鈥檚 ratio, the circumferential Young鈥檚 modulus and the circumferential-axial shear modulus of bamboo using ring specimens. The proposed protocol was used to determine the elastic properties of Guadua angustifolia, which is a species frequently used in structural applications in South America. The radial-circumferential Poisson鈥檚 ratios were equal to 0.43, 0.14 and 0.12 for the bottom, middle and top portions of the culm, respectively; the circumferential Young鈥檚 modulus was equal to 398 MPa; and the circumferential-axial shear modulus was equal to 581 MPa. These values are within the range reported for different species of bamboo and structural timber. These values could be used to accomplish reliable finite element analyses of joints of bamboo structures. The proposed protocol may be used to determine the anisotropic elastic constants of other species of bamboo.