Strength And Fatigue Of Multilayer Conveyor Belts Under Cyclic Loads
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Abstract
The article states that in a multi-layer conveyer belt operating under bending, stretching conditions and when transmitting a circumferential force from the drum, a complex stress state arises, which, using the positions of the theory of elasticity, is composed of systems of integral equations describing these states.
Solutions of system of integral equations at different values of diameters of drums, modulus of elasticity, modulus of rubber shear, thickness of gaskets, interlayers and number of gaskets are obtained regularities of change of tensile stresses and shear stresses from calculated factors.
The pattern of distribution of tensile stresses between the tape gaskets under the combined action of stretching, bending and circumferential force is plotted. It follows from the graph that the tensile stresses between the gaskets are distributed unevenly, compressive stresses arise in the rubber interlayers, caused by the action of the overlying stretched gaskets on the underlying ones. The compression stresses combined with the shear stress cause constant fatigue failure of the interlayers under belt operating conditions especially at small drum diameters and high belt tension.
Also, experimental studies were required to test the analytical description.
A series of experiments were carried out under various loading conditions, the tests consisted in experiments on specific values and regular wear of the resistance of the conveyor belts under the studied conditions of interaction of the belt with the drums, bending and shifting. An experimental study confirmed that the traction force transmitted to the belt from the drive drum significantly affects its wear resistance. With increasing traction force, the number of loading cycles to fatigue fracture of the belt decreases.
A link is established between the value of variable stresses in the conveyor belt and its fatigue failure.
Methods for calculating conveyor endurance belts and practical recommendations for applying the results of the study have been developed.
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