Some Aspects of Propeller Fatigue Testing: A Paper on the Practical Application of the Results of Fatigue Testing to the Design of Components

THE problems of fatigue testing are usually associated with the testing of specially machined specimens in a reverse loading machine such as the Whöler. Tests of this nature are designed to disclose the characteristic fatigue curve of the material freed from all imperfections necessitated in a mechanical structure by machining or design. The usual presentation of the results is, of course, in the form of the familiar S/N diagram, where the number of cycles required to produce a failure are plotted against the magnitude of the applied stress.