Forecasting calculated fatigue life of structural elements using the modified fatigue curves

Evaluation of fatigue life is based on the use of basic fatigue curves. However, due to large va-riety of possible design solutions basic fatigue curves cannot be calculated for all cases. In addi-tion, the production practice has a significant influence on the durability of structural elements. To predict the fatigue durability using the traditional method we need to consider the influence of structural and technological factors by introducing the correction coefficients established on the basis of the experience and accumulated experimental data. The correction coefficients are widely used in calculating the resource elements by domestic and foreign construction firms. Using the traditional method the match of the projected longevity and durability resulted in a bench test struc-tures are not always satisfactory. Often by conducting rapid analysis the sufficient fatigue curves absent, the closest in characteristics among the available are selected. The article presents the im-proved technique of numerical fatigue life prediction of structural elements by using the modified fatigue curves, considering the impact of structural and technological features of the products of the actual design. The results of calculated estimate of the resistance of fatigue thin-walled struc-tures and their comparison with experimental data are presented. On the basis of the work carried out was drawn the conclusion that by using the method of calculation of fatigue longevity using modified fatigue curves , considering the structural features fragments of products, the convergence of the results of predicting fatigue life and test bench results obtained higher than by using tradi-tional techniques.