Susceptibility of Cu−Fe−Ni alloys to stress concentrations under alternating loads

Conclusions

The fatigue strength of copper alloys in different conditions after heat treatment indicates that Fe−Ni alloys and Al−Fe−Ni bronze have a low sensitivity to stress concentrations, which remains almost constant with increases in hardness and strength. The high notch sensitivity of the alloys in the cold-drawn condition is due to the negligible capacity for hardening by plastic deformation.

Annealing lowers the fatigue strength of smooth samples, but has a positive effect on the fatigue strength of notched samples.