![]() The term ‘simply supported’ just means the shaft is held up at the two ends so that both ends are able to move and curve with the effect of the load. To the right is a point load such as occurs on the shafts carrying the gears in a gearbox. In the center is a uniform load such as on the head and tail pulleys of a conveyor. On the left-hand side is a cantilevered load such as the drive pulley on an electric motor. 1 shows three common situations of loaded round, rotating shafts. Bending Stress in Machinery Shaftsįigure No. Where there is a force there will also be stress and strain together. Your muscles contracting against the force of the half-full pail of water were straining to keep the load up. Strain describes the internal distortion produced by the force. The pain in the muscles of your outstretched right arm was from the internal pressure applied by your muscles. Stress is a term used to describe the internal pressure on a material caused by force acting on it. It would not be long before you would have to put it down because of the pain. If you were to hold a half-full pail of water in your right hand with your arm outstretched your muscles would start to ache. Keywords: Bending moments, tensile stress The point of highest stress can be found by looking at the arrangement of the shaft supports and loads and calculating the forces and stresses. Even if the stresses are below the load limit but fluctuate, it is possible that the shaft will break from fatigue. But if the stresses are greater than what the shaft can take it will bend. Provided the reactive stresses are within the shaft’s strength range it will take the load. These loads cause bending and the shaft reacts by producing counter stresses within itself. The shafts are mounted in bearings and turned by force through a drive arrangement. ![]() It is common to transmit motion using rotating shafts.
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