{"id":2015,"date":"2025-03-26T01:13:38","date_gmt":"2025-03-26T01:13:38","guid":{"rendered":"https:\/\/bambutec.com.br\/?post_type=publicacao&#038;p=2015"},"modified":"2025-03-26T02:16:13","modified_gmt":"2025-03-26T02:16:13","slug":"influence-of-elastic-properties-and-nodes-on-the-flexural-behaviour-of-bamboo-culms","status":"publish","type":"publicacao","link":"https:\/\/bambutec.com.br\/en\/publicacao\/influence-of-elastic-properties-and-nodes-on-the-flexural-behaviour-of-bamboo-culms\/","title":{"rendered":"Influence of elastic properties and nodes on the flexural behaviour of bamboo culms"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Advances in Bamboo Science Vol.\u00a09, 2024, 100100.\u00a0<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2773139124000454\" target=\"_blank\" rel=\"noreferrer noopener\">Access<\/a>\u00a0>><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M. Seixas; D. Cardoso; L.E. Moreira; S. Paciornik<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Abstract: The creep behavior of bamboo culms under long-term loadings was investigated in the present work.\u00a0Phyllostachys aurea\u00a0bamboo samples were subjected to four-point flexural creep tests at loads corresponding to 30%, 50%, and 80% of the bamboo's short-term bending strength. Creep and recovery behavior were evaluated for each loading level at room temperature over 398\u00a0days, allowing the attainment of primary, secondary, and tertiary creep stages. The failure of one creep test sample occurred at 73\u00a0MPa, and the failure mode due to creep was described. Creep mechanisms assessed included node flexibility, cylindrical bending, and shear. Node flexibility contributed 50\u201374% of total deflection, cylindrical bending contributed 24\u201348%, while shear contributed less than 2%. A four-element Burgers mechanical model was proposed, matching the experimental results for all loading levels. A viscous coefficient parameter of 4.3 to 30\u00d7\u2009103\u00a0GPa.day was inferred, corresponding to the linear dashpot\u00a0n1. These models estimated the bamboo culm deflection over time and predicted failure at a 40% increase in deflection. Overall, this study provided comprehensive insights into the long-term structural behavior of bamboo culms for use in design and engineering applications.<\/strong> This study investigates the influence of elastic properties and nodes on the flexural behaviour of bamboo culms by comparing different characterization techniques and theoretical approaches. The most representative parts of the bamboo culm were selected using microscopic images of bamboo cross-sections. These were sliced from the bottom, middle, and top parts of a single culm and were analyzed with Digital Image Processing. Four-point bending tests were conducted on twelve culms of&nbsp;<em>Phyllostachys aurea<\/em>, subdivided into groups of untreated (UN) and heat-treated (HT) samples. The axial modulus of elasticity (E<sub>b<\/sub>) and the shear modulus (G) were determined experimentally using four different mathematical models: (i) a global deflection model using the Euler-Bernoulli beam theory according to the ISO Standard; (ii) a global deflection model using the Timoshenko beam theory; (iii) a global deflection model based on the Timoshenko beam theory but accounting for the presence of nodes; and finally, (iv) a local model using extensometry. The dominant failure modes for UN and HT samples are described and discussed, and were influenced by the moisture content (MC). Approaches (i) and (ii) showed good agreement, giving reliable parameters to assess E<sub>b<\/sub>. The third approach (iii) indicated that the nodes significantly influence the flexural behaviour of the culms. Approach (iv) was appropriate for determining G, but resulted in higher values of E<sub>b<\/sub>, typically not representative of the material.<\/p>","protected":false},"excerpt":{"rendered":"<p>Advances in Bamboo Science Vol.\u00a09, 2024, 100100.\u00a0Clique para acessar\u00a0>> M. Seixas; D. Cardoso; L.E. Moreira; S. Paciornik Resumo: This study investigates the influence of elastic properties and nodes on the flexural behaviour of bamboo culms by comparing different characterization techniques and theoretical approaches. The most representative parts of the bamboo culm were selected using microscopic [&hellip;]<\/p>","protected":false},"featured_media":2045,"template":"","format":"standard","categories":[],"tags":[16,102,103,101,104],"class_list":["post-2015","publicacao","type-publicacao","status-publish","format-standard","has-post-thumbnail","hentry","tag-bamboo","tag-elastic-properties","tag-four-point-bending-test","tag-full-culm","tag-material-characterization"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao\/2015","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao"}],"about":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/types\/publicacao"}],"version-history":[{"count":6,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao\/2015\/revisions"}],"predecessor-version":[{"id":2046,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/publicacao\/2015\/revisions\/2046"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/media\/2045"}],"wp:attachment":[{"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/media?parent=2015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/categories?post=2015"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bambutec.com.br\/en\/wp-json\/wp\/v2\/tags?post=2015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}