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Recent studies have proved that there is no fatigue limit for metallic materials. The stress life curve continuously drops even after 10 cycles. However, existing design codes assume that there is a fatigue limit. Therefore, it is important to use appropriate safety factors if existing codes are used for life evaluations. This paper consist of developing the full range S-N curve from low cycle region to high cycle region upto giga cycle fatigue region of Aluminium alloys using the mathematical model. Combining monotonic test based empirical fatigue formulae and a Wholer field mathematical model, a new formula for developing full range stress life curves for medium strength material is proposed. The accuracy of proposed formula is verified using experimental fatigue data of two aluminium alloys. This formulae is used for prediction of stress life curve of one steel and comparing the obtained results with experimental fatigue data of steel for checking the application of formulae for other materials also. Keyword: Full range S-N curve, Monotonic test, Wholer field mathematical model, Emperical formulae, Aluminium alloys, Steel.

Developing Full Range S-N Curve of Aluminium Alloys using Mathematical Model