CEC/ICMC Conference, May 2025

On May 14th of this year, Keith presented the results of our work on the development of a unified low cycle fatigue design system for low-carbon Type 316 stainless steel.  This model was based on previous research by Hamada and Nakajima, whose results formed the basis of the JSME design standard for AISI316LN and JJ-1 stainless steel at 4K.  The AFMA model also uses test data from Commonwealth Fusion Systems at 77K and publicly available literature at room temperature.

LCF behavior of both Type 316LN and Inconel 718 were evaluated using Hartman and Glinka's approach of predicting fatigue behavior on the basis of monotonic material properties, specifically elastic modulus and Brinell hardness.  Results of this evaluation were encouraging and suggest additional work and further development at other temperatures could make this method useful as a basis for preliminary design.