Apparent dynamic friction coefficients for grain crops
Abstract: The proper design of grain handling equipment requires knowledge of its frictional characteristics. The force of friction must be overcome before these materials will flow or before motor can start a loaded conveyor. A friction device was developed and fabricated at AEnRI workshop, Dokki, Giza. The developed device was connected to Instron machine model MTS Sintech built with 250N load cell and was used to measure the friction force. The Static and Dynamic coefficient of friction of wheat, and fababean on three horizontal surfaces (wood, steel and rubber), were measured. Three moisture contents (MC), four different applied normal loads (20, 40, 60, and 80 N) and five different sliding speeds (100, 300, 500, 700 and 900 mm/min) were performed.
The coefficients of friction of wheat and fababean grains sliding against all the tested surfaces increased with an increase in moisture content but with different degrees. The coefficients of friction between wheat and fababean grains and tested surfaces increased with an increase in applied normal load.
The increases in coefficient of friction specially in the case of soft surface was considered due to a compound opposing force (resistance force) consisting of two elements, the first one was the force to overcome friction, and the second one was the force to overcome the dissipated energy in the deformation occurred in both the grains and the soft sliding surface. This was the reason to give coefficient the name of apparent dynamic coefficient of friction.
Publication year 2007
Pages 557-574
Availability location (بحوث تصميم وتطوير الآلات) معهد بحوث الهندسة الزراعية
Availability number
Organization Name
serial title المجلة المصرية للهندسة الزراعية
Author(s) from ARC
Agris Categories Agricultural machinery and equipment
Proposed Agrovoc Apparent Dynamic Friction;grain handling equipment;
Publication Type Journal
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