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Simulation of soil dynamic properties of a seed opener using the discrete element method (DEM) CIGR Journal
Chen, Ying; Gao, Qun; Zhou, Haibo; Sadek, Mohammad A..
Soil disturbance and draft force are important soil dynamic properties and performance indicators for a seed opener. In this study, a soil-opener model was developed to simulate soil dynamic properties of a hoe type seed opener using the discrete element method (DEM). To validate the model, a paired-row hoe opener was tested in a sandy loam soil at a working depth of 40 mm and a travel speed of 7 km/h. Soil disturbance characteristics (maximum soil surface roughness and soil cover depth) and draft force of the opener were measured. The model results agreed well with the test results, with relative errors under 10%. The validated model was used to compare the soil dynamic properties among a single-row opener, a side-band opener, and a paired-row opener. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural machinery Disturbance dynamics; Force; Hoe; Opener; DEM; PFC; Soil.
Ano: 2015 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3227
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Simulation of tensile tests of hemp fibre using discrete element method CIGR Journal
Chen, Ying; Sadek, Mohammad A.; Guzman, Leno; Lague, Claude; Landry, Hubert.
Abstract: Tensile strength is an important property of hemp fibre, because it determines the mechanical strength of fibre-based products such as biocomposites.  Commercial discrete element software, Particle Flow Code in Three Dimensions (PFC3D), was used to develop a numerical model which simulates tensile tests of hemp fibre.  The model can predict the tensile properties (such as strength and elongation) of a hemp fibre. In the model, a virtual hemp fibre was defined as a string of spherical balls, held together by cylindrical bonds implemented in PFC3D.  To calibrate the model, tensile data was collected for both unretted and retted hemp fibres using a commercial Instron testing system.  The average fibre diameter was 0.34 mm for the unretted fibre and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioprocessing; Machinery Hemp; Fibre; PFC3D; Tensile; Strength; Elongation; Simulation.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2455
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