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All Journal Indonesian Journal of Innovation and Applied Sciences (IJIAS)
Waktole, Samson
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Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Industrial & Manufacturing Engineering Mathematics Social Sciences

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Variation of Physical Properties of Eucalyptus globulus Grown in Ethiopia Waktole, Samson; Musa, Mahadi; Abara, Lamesa; Mezegebu, Getachew; Wale, Meseganaw; Wubeshet, Tsegaye; Tesfaye, Anteneh
Indonesian Journal of Innovation and Applied Sciences (IJIAS) Vol. 4 No. 3 (2024): October-January
Publisher : CV. Literasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47540/ijias.v4i3.1372

Abstract

This study investigated the variability of density, shrinkage, and sap-heartwood proportion in different sites and within a tree. 10 trees of E. globulus from Menagesha Suba (M/Suba) and Debre Birhan (D/Birhan) forests were felled and 12 disks from each tree were collected along the stem. From each disk blocks of 2*2*3cm were taken at three locations from pith to bark. Then the block's green and oven dry weights as well as the three dimensions were measured. The result showed that the density and radial shrinkage of trees from M/Suba were significantly higher than D/Birhan forest. However, tangential, longitudinal shrinkage and sapwood proportion of trees from D/Birhan were significantly higher than M/Suba forest. Along the height, at both sites, density was increasing from bottom to top. In both sites, all shrinkages had shown a decreasing trend from breast height to 40%. Sap-heartwood proportions were irregular in trend along the height in both sites. Density shows an irregular pattern radially at both sites. At M/Suba, radial and tangential shrinkages increased from pith to bark. However longitudinal shrinkage exhibited a decreasing trend from pith to bark. At the D/Birhan forest, all shrinkages showed irregular patterns from pith to bark. Density was highly variable along the height in both study sites. Radially, density was more variable in the D/Birhan site. This study recommended that for end-uses requiring durable, denser, and stable wood, E. globulus from the M/Suba forest was better. For pulp wood, E. globulus from D/Birhan was recommended.
Investigation of Physical and Mechanical Properties and Their Relationship in Senegalia caffra Wood Grown in Northern Ethiopia Waktole, Samson; Mussa, Mahadi; Abara, Lamesa; Wale, Misganaw; Mogninet, Kassahun
Indonesian Journal of Innovation and Applied Sciences (IJIAS) Vol. 5 No. 1 (2025): February-May
Publisher : CV. Literasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47540/ijias.v5i1.1767

Abstract

This research focused on determining the physical and mechanical properties of Senegalia caffra collected from a Gilgile Beles site in Ethiopia and analyzing how these properties relate to the wood's performance. Fifteen (15) sample trees were selected and felled for the study. Sampling, specimen preparation, and conducting the different tests were achieved following ISO and British standards. In this study, the mean basic density of 594.40 Kg/m3, modulus of elasticity (MoE) of 9,556.79 N/mm2, modulus of rupture (MoR) of 105.69 N/mm2, compression strength parallel to the grain of 53.15 N/mm, impact bending strength of 14,825.00 Nm/m2, radial and tangential hardnesses of 4,958.67 N and 5,324.78 N, respectively, were obtained for the species. Senegalia caffra was superior to the high timber-value tree species of Ethiopia in most of the studied features. The bottom of the tree was highest in density, MoE, MoR, radial, and tangential hardnesses; whereas, the middle height was higher in compression and impact bending strengths. Heartwood was higher in density, MoE, compression strength, and radial and tangential hardnesses than sapwood. Density was moderately correlated with radial hardness (with an R of 0.605 and sig. of 0.000). Generally, higher properties were recorded at the bottom of the tree as well as in the heartwood.
Co-Authors Abara, Lamesa Mezegebu, Getachew Mogninet, Kassahun Musa, Mahadi Mussa, Mahadi Tesfaye, Anteneh Wale, Meseganaw Wale, Misganaw Wubeshet, Tsegaye