African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Some mechanical and physical properties of corn seed (Var. DCC 370)

Javad Tarighi1, Asghar Mahmoudi2, and Naser Alavi3
1.PhD Student in Department of Mechanical Engineering of Agricultural Machinery, Faculty of Agricultural Engineering, University of Tabriz. 2.Assistant Professor in Mechanical Engineering of Agriculture Machinery, Faculty of Agricultural Engineering, University of Tabriz. 3.Assistant Professor in Mechanical Engineering of Agriculture Machinery, Faculty of Agricultural Engineering, University of Shahid Bahonar Kerman.
Email: [email protected]

  •  Accepted: 11 April 2011
  •  Published: 18 August 2011

Abstract

Physical and mechanical properties of food crops gain importance during design, improvement and optimization of separation and cleaning. In this study, some physical and mechanical properties of corn seeds were determined as a function of moisture content in the range of 5.15 to 22% d.b. The average length, width, thickness and arithmetic diameter were increased by 6, 2.2, 1.66, and 3.3%, with increasing moisture content, respectively. In the moisture range from 5.15 to 22% d.b., the results showed that, the thousand seed mass increased from 267.7 to 305.8 g, the porosity from 31.41 to 45.98%, the static angle of repose from 42 to 57, and the coefficient of friction on compressed plastic, plywood and galvanized iron sheet surfaces were increased from 0.36 to 0.67, 0.36 to 0.6 and 0.38 to 0.57, respectively. The bulk density decreased from 679.1 to 632 kgm-3 and true density increased from 999.33 to 1170.49 kgm-3. Moreover, surface area and volume increased as the moisture content increased. The rupture energy of the grains increased in magnitude with an increase in moisture content, while rupture force was decreasing.

 

Key words: Mechanical properties, corn, rupture force, coefficient of friction, repose angle.