Abstract
A method for testing crankshafts of automobile and tractor engines under the action of variable bending moment is proposed. The test machine consists of a frame on which the crankshaft is installed through elastic springs on the extreme root necks. On the extreme necks, pendulums are installed, one end of which is rigidly fixed, and at the opposite ends of the pendulums, two inertial (unbalanced) vibrators are installed, creating two equal forces in the horizontal plane, directed in opposite directions and changing their magnitude. This pair of forces creates a variable bending moment relative to the axis of the crankshaft, acting on all its elements, and causes fatigue failure in the weakest sections. Based on the test results, a graph is plotted in the coordinates of maximum stress – the number of loading cycles before failure, which allows you to determine the parameters of the crankshaft fatigue life model.According to the corrected linear hypothesis of fatigue damage accumulation, shaft failure occurs when the sum of accumulated damage is equal to a certain value, which is determined by the results of fatigue tests.
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