Influence of moisture content and loading orientation on some mechanical properties of Mucuna flagellipes nut

N.A. Aviara, O.A. Onuh and S.E. Ehiabhi
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N.A. Aviara: Department of Agricultural and Environmental Resources Engineering, University of Maiduguri, Maiduguri, Nigeria
O.A. Onuh: Department of Agricultural and Environmental Resources Engineering, University of Maiduguri, Maiduguri, Nigeria
S.E. Ehiabhi: Department of Agricultural and Environmental Resources Engineering, University of Maiduguri, Maiduguri, Nigeria

Research in Agricultural Engineering, 2012, vol. 58, issue 2, 66-72

Abstract: The effects of moisture content and loading orientation on some strength properties of Mucuna flagellipes nut namely, bioyield, yield and rupture points; bioyield, compressive and rupture strengths; and moduli of elasticity, resilience, toughness and stiffness were determined at lateral and longitudinal axial loading, using a Testometric Universal Testing Machine (UTM). In the moisture range of 3.38-10.7% (d.b.), bioyield, yield and rupture points of the nut decreased from 1,137 to 755 N, 1,157 to 790 N and 685 to 365 N, respectively, when loading was on the lateral axis, and increased from 1,090 to 1,888 N, 1,092 to 1,918 N and 420 to 1,215 N on longitudinal loading. Bioyield strength (1.83-1.41 N/mm2), compressive strength (1.85-1.44 N/mm2) and rupture strength (1.03-0.74 N/mm2), decreased with increase in moisture content under lateral loading, but increased from 4.05 to 8.17 N/mm2, 4.15 to 8.45 N/mm2 and 2.6 to 6.3 N/mm2, respectively, as the moisture content increased in the above range, under longitudinal loading. The elasticity, toughness and stiffness moduli of the nut decreased (23-16.6 N/mm2, 0.615-0.525 J and 272.8-250 N/mm, respectively) with increase in moisture content under lateral loading, and increased (34.5-66.56 N/mm2, 0.508-0.69 J and 246-369 N/mm, respectively) with moisture content on longitudinal loading. On the above loading orientations, modulus of resilience increased from 0.166 to 0.355 J, and 0.255 to 0.576 J respectively, with moisture content. The properties were higher on the longitudinal than lateral axial loading. Second order polynomial equations relating these properties to moisture content were established.

Keywords: bioyield; compressive tests; modulus of elasticity; rupture; strength properties; Nigeria (search for similar items in EconPapers)
Date: 2012
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DOI: 10.17221/12/2011-RAE

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