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| International Agrophysics |
| publisher: | Institute of Agrophysics
Polish Academy of Sciences
Lublin, Poland |
| ISSN: |
0236-8722 |
vol. 22, nr. 2 (2008)
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Determination of Poisson’s ratio and elastic modulus of African nutmeg (Monodora myristica)
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W. Burubai1, E. Amula1, R.M. Davies2, G.W.W. Etekpe3, 3
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1 Department of Agricultural Engineering, Rivers State University of Science and Technology, P.M.B. 5080, Port Harcourt, Rivers State, Nigeria |
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2 Department of Agricultural Engineering, Niger Delta University, Bayelsa State, Nigeria |
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3 Department of Agricultural Technology, Bayelsa State College of Arts and Science, Yenagoa, Bayelsa State, Nigeria |
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vol. 22 (2008), nr. 2,
pp. 99-102
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abstract
An investigation into the Poisson’s ratio and elastic modulus of African nutmeg as a function of moisture content and loading rate was carried out. Quasi-static compressive tests were conducted at moisture levels of 8, 11.2, 14, 17.4 and 28.7% (d.b.) in an axial loading orientation. Both unit lateral extension and unit normal compression values were determined. Average values of 0.512 to 0.275 were obtained for moisture levels of 8 to 28.7%, respectively. Effects of loading rates were also investigated and results show that Poisson’s ratio increased from 0.136 to 0.334 at loading rates of 1 and 7 mm min-1, respectively. Elastic modulus was observed to decrease as moisture increased. Average values of 201.5 to 41.30 N mm-2 were noted for moisture levels of 8 to 28.7%, respectively. A similar negative trend was observed with loading rate. These finding could therefore be useful in predicting the load deformation behaviour of African nutmeg.
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keywords
African nutmeg, Poisson’s ratio, elastic modulus, moisture content
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