Experimental study of the low-cyclic fatigue under variable parameters of cycle at various temperatures and types of loading
Uniaxial tension tests were carried out on Instron 8801 servohydraulic test system (maximum load of tension and compression is 100 kN, cyclic tests with frequency up to 30 Hz) with using of axial extensometer Instron 2620-601. Biaxial tension-torsion tests were carried out on Instron 8850 biaxial servohydraulic test system (maximum load of tension and compression is 100 kN, maximum torque is 1000 Nm, cyclic tests with frequency up to 30 Hz) with using of biaxial (tension with torsion) extensometer Epsilon 3550-010M and Epsilon 3550HT-025M.
In tests were used solid cylindrical and thin-walled tubular specimens of structural steels and aluminum alloy. Triangle and M-shape cycles and block loading were realized in the uniaxial and biaxial tests. In the complex tests under tension and torsion, the trajectories with bend in axis of axial strain and shear angle were used.