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Home  >  Volume 45

33. MOTION AND FATIGUE ANALYSIS OF AN ELECTRIC-POWERED LAWNMOWER BLADE by LinusG. S., Olagbegi P. O., Sadjere E. G. and Ibhadode O. O. Volume 45 (March, 2018), pp 245 – 252
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Fatigue analysis and consequent life prediction of lawnmower blade requires the stress load history of the blade. A blade designed for safe operation at particular constant rotor speeds may, however, incur damaging stresses during start-up and shut-down operations. Usually lawnmower blades are subjected to high centrifugal forces due to high rotational speed and operation at critical environmental conditions. Consequently, the mower blades can fail by fatigue or creep.  We first give the blade a torque loading which was done in motion analysis. The stress result of motion analysis was fed as input into fatigue simulation. The essence of this is to determine the maximum Von Mises stress, maximum displacement and minimum factor of safety in motion analysis and the total life of the designed mower blade, fatigue damage and load factor in fatigue simulation. The maximum displacement obtained at 2.08 seconds is a little above 0.9mm and the minimum factor of safety obtained throughout the motion analysis is 2.7.The fatigue simulation gives highest damage (4657), lowest total life (2.147×〖10〗^4cycles) and lowest load factor (0.52) respectively. The results of plot distribution of maximum Von Mises stresses obtained from motion analysis are 62.8MPa, 11.6MPa and 62.8MPa at 1 second, 2 seconds and 2.88 seconds respectively during the motion of the blade. These maximum stresses are observable at the inner bends of the blade where we expect considerably high stress concentrations.

Keywords: Lawnmower, Fatigue, Solidworks, Load factor, Total life.