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      • < 전시-P-18 > Viscoelastic properties of bamboo

        ( Wahyu Dwianto ),( Danang Sudarwoko Adi ),( Teguh Darmawan ),( Mohamad Gopar ),( Lisman Suryanegara ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1

        This study relates to measurement of the viscoelastic properties of bamboo to answer why bamboo is more easily bent than wood, whether this is related to its anatomical structure or its chemical components. To answer this question, static bending testing on the bamboo was done in dry, fresh, and after softening conditions. Andong (Gigantochloa pseudoarundinaceae (Steud.) Widjaja) bamboo which has potential as raw material of bamboo lamination was used in this experiments. For static bending tests, the bamboo internode was cut 30cm in length, 2cm in width and with varying thickness depending on the location of the internode on the stem (20 internodes/stem). Measurement results indicating that the diameter of the internode and its wall thickness decreases from the bottom to the top of internode. This causes moisture content of fresh bamboo decreases from the bottom to the top of internode. Modulus of rupture (MOR) increases, but its modulus of elasticity (MOE) decreases. This is due to the increased density towards the top of internode. Increased density is associated with anatomical structure, where in the top of internode, the portion of vascular bundles are greater than the parenchyma cells. Elastic limits, in-elastic limits, and maximum deflections before fracture is gradually decreases with different bamboo conditions from dry, fresh, and after softening. Anatomical structures will further observed from various curved radius after bent as well as the contents of chemical components analyzed to know the effect on softening condition of bamboo. Furthermore, the viscoelastic properties of bamboo will be compared with wood with the same density. However, it can be predicted that bamboo can be more easily bent because there are many parenchyma cells with thin-walled cells in the inner parts and more easily softened.

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