EJPAU 2006. Stasiak M. , Molenda M. , Horabik J. MODULUS OF ELASTICITY OF RAPESEEDS BY EDOMETRIC AND ACOUSTIC METHODS

Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

2006
Volume 9
Issue 4

Topic:

Agricultural Engineering

ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES

Stasiak M. , Molenda M. , Horabik J. 2006. MODULUS OF ELASTICITY OF RAPESEEDS BY EDOMETRIC AND ACOUSTIC METHODS, EJPAU 9(4), #06.
Available Online: http://www.ejpau.media.pl/volume9/issue4/abs-06.html

MODULUS OF ELASTICITY OF RAPESEEDS BY EDOMETRIC AND ACOUSTIC METHODS

Mateusz Stasiak¹, Marek Molenda¹, Józef Horabik²
¹ Department of Physical and Technological Properties of Agricultural Materials, Institute of Agrophysics, Polish Academy of Science, Lublin, Poland
² Institute of Agrophysics, Polish Academy of Sciences, Lublin, Poland

ABSTRACT

Numerous branches of industry deal with granular materials such as pills and powders in the pharmaceutical and food industries or mineral powders in the construction businesses. Efficient handling and processing of large amounts of these materials require understanding of their mechanical behaviour. Process of optimization is based on knowledge of material properties that depends on properties of individual grains, interparticle friction, contact geometry and load history.

Objective of performed project was to determine and compare values of the modulus of elasticity E of rapeseeds, obtained using two methods: uniaxial compression and acoustic testing. Research was carried out for rapeseed beddings of four levels of moisture contents 6, 9, 12 and 15%. Uniaxial compression was used, as proposed by Sawicki [12]. Vertical reference pressure of 100 kPa was applied. With this method E was found to decrease from 9.0 to 6.6 MPa, with an increase in moisture content. Values of E determined using acoustic method, based on measurement of shear wave velocity, were higher then those found in uniaxial compression and decreased from 62 to 3 MPa in a range of hydrostatic pressure. Values of E from acoustic method varied in larger extent with change in moisture content and were dependant on hydrostatic pressure.

Key words: granular material, rapeseed, elasticity, modulus of elasticity, uniaxial compression, shear wave velocity.

Mateusz Stasiak
Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
Doświadczalna 4,
P.O. Box 201, 20-290 Lublin 27, Poland
Phone: (+48) 81 743 85 58
Fax: (+48) 81 744 50 67
email: mstasiak@ipan.lublin.pl

Marek Molenda
Department of Physical and Technological Properties
of Agricultural Materials, Institute of Agrophysics,
Polish Academy of Science, Lublin, Poland
Doświadczalna 4,
P.O. Box 201, 20-290 Lublin 27, Poland

Józef Horabik
Institute of Agrophysics,
Polish Academy of Sciences, Lublin, Poland
Doświadczalna 4, 20-290 Lubln 27, Poland
phone: (+48 81) 744 50 61
fax (+48 81) 744 50 67

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