THREE-DIMENSIONAL S-N CURVE METHOD TO ESTIMATE FATIGUE LIFE OF EN AW 6063.T66 ALUMINIUM ALLOY DURING COMBINED LOADING UNDER IN-AND-OUT OF PHASE SHIFT 0° AND 90° AND COMPARING WITH FATIGUE CRITERIA
The article deals with determining of fatigue lifetime of structural materials during by multiaxial cyclic loading. The theoretical part deals with the fatigue and with criteria for evaluation of multiaxial fatigue lifetime, especially Fatemi-Socie, Smith-Watson-Topper, Brown-Miller and Liu. The experimental part deals with testing of specimens for identification of the strain-life behaviour of material and determining the number of cycles to fracture of aluminium alloy for phase shift 0° and 90°. Extensive fatigue experiments were conducted using 6063.T66 aluminium alloy under multiaxial bending-torsion loading.