Fatigue Limit Prediction Based on Hardness for Both Steel and Aluminum Alloys

Abstract

Abstract The values of the fatigue limit of the substance represent how resistant it is to the worst of all that this material was Ferrous and non-ferrous. The values of this limitation can be inferred by creating a Wohler curve (S-N curve) is called and requires testing many samples that require a long time and a great effort to reach the final result. This research has created two athletic models for steel and aluminum alloys, without the need to create the Wohler curve (S-N curve) for these alloys. The two proposed models are (Fatigue limit = 1.30 x Steel Hardness (BH) for steel alloys) and (Fatigue limit = 1.85 x Aluminum Hardness (BH) for Al-alloys). The results obtained from these two models were compared with the results of the Heller curve for steel alloy (HRB400) and aluminum alloy (AA2017) by following the method of rotational bending loading and this comparison showed a very reasonable result. The results were also compared with results extracted from previous models, and it was found that the previous models gave a less accurate fatigue limit compared to the Wohler curve.