Experimental study of fatigue life of aluminum alloy in tension with torsion

The work is devoted to experimental investigation of the number of cycles to failure of aluminum alloy Д16Т in the combined loading tests at tension with torsion. The experimental results under uniaxial cyclic loading with an additional component of the constant shear stress are presented. The value of constant component of shear stress τ with respect to shear yield stress τ 03 which were determined in static tests was changed from 0 to 0.7. The tests were carried out on two levels of axial stress amplitude (250 MPa and 280 MPa). The experimental data of the number of cycles to failure under different value of the additional component of the constant shear stress were obtained. It is noted that with increase of the axial stress amplitude the effect of the constant component of the shear stress is reduced.