Predicting endurance in programmed cyclic loading taking into account scattering of the properties

A method of constructing the fatigue curves for individual specimens by measuring the inelasticity characteristics on the reference level of the stress amplitude is proposed.If the scatter of the fatigue strength characteristics of the individual specimens is taken into account using the proposed method, the agreement between the experimental data and the linear hypothesis of damage summation is improved.In the given steels and loading regimes, the main error in applying the Palmgren-Mainer hypothesis is caused by the fact that the scatter of the properties of the individual specimens is not taken into account in calculating endurance.The best agreement between the experimental and calculated values of the number of cycles to fracture is recorded in the range of short endurances. A method of constructing the fatigue curves for individual specimens by measuring the inelasticity characteristics on the reference level of the stress amplitude is proposed. If the scatter of the fatigue strength characteristics of the individual specimens is taken into account using the proposed method, the agreement between the experimental data and the linear hypothesis of damage summation is improved. In the given steels and loading regimes, the main error in applying the Palmgren-Mainer hypothesis is caused by the fact that the scatter of the properties of the individual specimens is not taken into account in calculating endurance. The best agreement between the experimental and calculated values of the number of cycles to fracture is recorded in the range of short endurances.