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A Study on Physico-Mechanical Properties of Thyrsostachy Ssiamensis (Kurz) Gamble and Dendrocalmus Membrances (Munro) in Tumkur District, Karanataka, India

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A Study on Physico-Mechanical Properties of Thyrsostachy Ssiamensis (Kurz) Gamble and Dendrocalmus Membrances (Munro) in Tumkur District, Karanataka, India Int.J.Curr.Microbiol.App.Sci (2013) 2(2):62-66 ISSN: 2319-7692 Volume 2 Number 2 (2013) pp.62 66 http://www.ijcmas.com Original Research Article A study on physico-mechanical properties of Thyrsostachy ssiamensis (Kurz) Gamble and Dendrocalmus membrances (Munro) in Tumkur district, Karanataka, India Narasimhamurthy*, C.Maya, Anand Nadanwar, and C.N.Pandey Biology Division, Indian Plywood Industries Research and Training Institute [IPIRTI], Tumkur Road, Banglore-560 022. *Corresponding author: [email protected] A B S T R A C T The physical and mechanical properties of two bamboo species viz. Thyrsostachys siamensis and Dendrocalmus membrances were studied from three locations of bamboo viz. Top (T), Middle (M) and bottom (B). The K e y w o r d s average values of physical and mechanical properties of both bamboo species were reported. From the study it was observed that Thyrsostachys siamensis Physical; species is almost solid at bottom and middle portion, but hollow at top Mechanical portion, where as Dendrocalmus membrances species is hollow in structure Properties; throughout its length. It was observed that the specific gravity of Specific density; Thyrsostachys siamensis and Dendrocalmus membrances species of bamboo Bamboo culms. varies between 0.45 to 0.75 and 0.55 to 0.65 respectively depending mainly on the anatomical structure. Both species bears good mechanical properties however, the MoR and cincreasedompressiv emarket streng tdhemand. of Thy r s o s tachys siamensis species was found to be about 15% more than that of Dendrocalmus membrances species and MoE of Thyrsostachys siamensis species was found to be about 5% more than that of Dendrocalmus membrances species. Introduction Bamboo is a fast growing fibrous grass The bamboo culm or stem are made into an available in abundance on the earth, extended diversity of products ranging from particularly in tropical and subtropical domestic household products to industrial regions. Their culms can grow to their full applications. Examples of bamboo products height of 3-30 m within a few months, due are food containers, skewers, chopsticks, to the expansion of individual internodes handicrafts, toys, furniture, flooring, pulp already present in the buds. Bamboo has a and paper, boats, charcoal, musical very long history with human civilization. It instruments, weapons etc. In Asia, bamboo has been widely used for household products is quite common for bridges, scaffolding and and extended to industrial applications due housing, but it is usually a temporary to advances in processing technology and exterior structural material. Further more, 62 Int.J.Curr.Microbiol.App.Sci (2013) 2(2):62-66 the general properties of the bamboo culms The specific gravity of bamboo varies from are based on the anatomical, chemical, about 0.5 to 0.79, and this would make the physical and mechanical characteristics. density about 648 kg/m3 (40.5 lb/ ft3). Physical and mechanical properties of Similarly, reports established that the bamboo depend on the species, site/soil, average specific gravity of bamboo ranged climatic condition, silvicultural treatment, from 0.3 to 0.8. Chew et al. (1992), gives harvesting technique, age, density, moisture the density of B.vulgarisat 630 kg /m3, content, position in the culm, nodes or which is relatively light, compared to other internodes and bio-degradation. Most studies bamboos. Density is the major factor that had been carried out in order to highlight influences the mechanical properties, and it and observe these fundamental is closely related to the proportion of characteristics, as well as to maximize vascular bundles. Abd. Latif (1990) bamboo utilization. Age is an important suggested that longer fibre will decrease the factor for the developmentof strength shear strength, which was primarily due to properties. It is a general assumption that cell wall thickness or density rather than the bamboo mature and reach its maximum percentage of the parenchyma fibers. The strength in about three years. cell wall thickness has a positive correlation with compression strength, bending stress at Many studies have been carried on the proportional limit and MOE, but negatively anatomical features of bamboo and its correlated to MOR. In the present study, the anatomical features directly affect bamboo physical and mechanical properties of six physical and mechanical properties. year old Thyrostaches siamensis and Dendroclamus memernceses at three levels Physical and mechanical properties of of culm height are evaluated. bamboo depend on the species, site/soil and climatic condition, silvicultural treatment, harvesting technique, age, density, moisture Materials and Methods content, position in the culm, nodes or internodes and bio-degradation. Most of the A moderate-sized, strong bamboo forming studies had been carried out in order to loose clump, straight culm samples from two highlight and observe these fundamental bamboo species namely Dendrocalamus characteristics, as well as to maximize membranaceus Munro and Thyrsostachys bamboo utilization Abd. Latif et al (1993), siamensis Gamble of 20-24 m high, 6-10 cm studied the effect of anatomical diameter and 12-15 m 4.5-5 cm diameter characteristics on the physical and respectively of 4-6 year age were collected mechanical properties of B.bluemeana. from bamboo Arboratum of BIAF, S. Lakkahalli near Tiptur taluk of Tumkur Several authors reported the physical and district, Karanataka, India for the study. mechanical properties of D.strictus. According to this study, age and height do Five bamboo culms in each species were not significantly affect moisture content.The harvested and investigated for physical radial and tangential shrinkage of properties like length, diameter and number B.bluemeana, did not differ significantly of internode etc., were recorded at felling through age and height. The radial and site itself. Whereas mechanical properties tangential shrinkage ranges from 5.4% to like Modulus of elasticity (MOE), Modulus 9.5% and 6.4% to 20.1% respectively. of rupture (MOR) and compressive strength 63 Int.J.Curr.Microbiol.App.Sci (2013) 2(2):62-66 were evaluated at laboratory. Bamboo Compressive strength samples were converted into strips for determining mechanical properties. Each Compressive strength of round bamboo bamboo sample was divided into three samples were derived at three portions of portions of bottom (B), middle (M) and top bottom (B), middle (M) and top (T) using (T). Strength of bamboo viz., compression UTM. parallel to grain & static bending were conducted using computer controlled Results Universal Testing Machine (UTM). The samplesof two bamboo species were tested against physical and mechanical Moisture content (MC) properties. The physical properties like culm height, internode length, number of Sample blocks of Dendrocalamus internodes per culm and culm wall thickness membranaceus Munro and Thyrsostachys etc. were measured at the felling site and siamensis were derived from 3 height portions (bottom, middle and top) and 6 results recorded as shown in the table 1. The replicates, consisting of thirty-six bamboo moisture content of bamboo varies vertically samples. All sample blocks were cut from from the bottom to the top. Green bamboo fresh culms of size 10 mm × 10 mm × culms may have 100% moisture (oven-dry weight wall thickness. They were weighed and basis) and can be as high as 110 % as (table dried in an oven at 103±2°C for 24 hr until a 2). Basic density of the two bamboo species constant weight was attained. varies from bottom to top and node to Basic density internode. In Thyrsostachys siamensis density varies from bottom to top in the Sample for basic density studies were range of 700 to 400kg/m3 along with node obtained from both node and internode at the and internode. Whereas in Dendrocalmus bottom, middle and top culms portions from membrances the density variation is 650 to each bamboo species. Six replicates were 550 kg/m3 along with node to internode used in the study. The sample blocks were (table 3). oven dried for 48 h at 105±2°C until a constant weight were attained. The sample blocks were then weighed to give the oven Mechanical properties of both the species dried weight. Basic mass per volume shall were tested at laboratory using Universal be calculated as follows:- Testing Machine (UTM) and results were 3 Mass per volume, I g/cm =mo /vgx100 recorded in the table 4. From the table the mo=oven dry mass in grams vg= green mean value of MOE of 7091MPa and 6827 volume in cm3 MPa, MOR of 124.2 MPa and 109.1 MPa MoR and MoE and compression strength of 77.5 and 67.0were observed for Thyrsostachys Bamboo samples were converted into strips siamensis and Dendrocalmus membrances for determining MoR and MoE at three species respectively. From the above studies portions of bottom (B), middle (M) and top the results it is observed that the physical (T) under three point loading using UTM. and mechanical properties of both the 64 Int.J.Curr.Microbiol.App.Sci (2013) 2(2):62-66 species varies from bottom to top and node to internode of bamboo culms. Physical and mechanical properties of two bamboo species are presented in Table.1 and Table 4. Table.1 Physical characteristics of Thyrsostachys siamensis and Dendrocalmus membrances bamboo tested in green condition. Bamboo species S. No. Characteristics Thyrsostachys siamensis Dendrocalmus membrances 1 Culm height (cm) 1600 2000 2 No. of internodes/culm 13 25 3 Internode length (cm) Bottom 33 27.94 Middle 38 27.94
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