The Clemson Limit Stress Diagram for Ductile Parts Subjected to Positive Mean Fatigue Loading

The Bagci, Gerber, Goodman, quadratic, and Soderberg diagrams are some of the diagrams proposed to serve as practical design tools for the design of ductile metals loaded in fatigue with positive mean and alternating stresses. However, all of these diagrams are either conservative, or have domains containing stress greater than yield strength of material. This paper presents the Clemson diagram, which has the same format as the aforementioned diagrams with the exception that the exponential power order varies with the material property. The Clemson diagram has a great potential to fit the experimental data and appears to better fit the limited data found in the open literature. A good initial approximation of an acceptable design for parts made of ductile ferrous materials can be obtained by using the proposed diagram.