![]() Therefore the size modification factor helps to find the actual endurance limit based on the size of a machine component.Ĭ) Load factor (Kc): The load modification factor finds the actual endurance limit based on different actual load conditions.ĭ) Temperature modification factor (Kd): The endurance limit of the machine component decreases with the increase in its operating temperature. Therefore the surface finish factor helps to find the endurance limit of the actual machine component.ī) Size modification factor (Kb): As the size of the machine component increases, the endurance limit of the mechanical component decreases. The scratches present on the surface of the mechanical components can reduce the magnitude of the actual endurance limit. These modifying factors are listed below:-Ī) Surface finish factors (Ka): The test specimen has a highly finished surface, but the surface finish of the machine component is poor as compared to the test specimen. Therefore for the mechanical components, the actual endurance limit can be obtained by using different modifying factors. But these results are not accurate for the machine components. The endurance limit is calculated for the standard specimen with standard size and highly finished surface based on the rotating beam experiment. Therefore the motor helps to create cyclic stress (completely reversed stress) into a specimen.įor finding the endurance limit, the specimen has to load with bending stress slightly less than ultimate tensile stress (`sigma_`). The motor attached to the specimen alters the direction of the bending stress by keeping the magnitude constant. In this experiment, the standard specimen of the given material is mounted onto the experimental setup.īecause of the loads applied, the specimen is subjected to constant pure bending stress. ![]() ![]() The endurance limit can be calculated by using a rotating-beam experiment. ![]()
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