Article presents continuous forms of S-N and Mean Stress Diagrams for fatigue design of machine and structural components against breakage; and offers data verifying the proposed forms of the diagrams. Two forms of constructing the mean stress diagram — one for the test specimen, one for the critical section of the machine component — are offered. Defects in using conventional forms of the diagrams are removed. Discussions upgrading fatigue strength reduction factors are included. Computer-aided fatigue design applications are discussed. Determining remaining life considering cumulative damage effect using the offered forms of design diagrams is also included. Application examples are given.

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