Analysis of low-cycle curves with different load cycle asymmetry coefficients for EP741NP material

Аuthors

Krupenin A. M.

A Lyulka Experimental Design Bureau – Branch of PJSC “UEC-UMPO”, 13, Kasatkina str., Moscow, 129301, Russia

e-mail: Zeus-RUSS@yandex.ru

Abstract

The study investigates low‑cycle fatigue curves of the EP741NP alloy at various temperatures and loading cycle asymmetries. It is demonstrated that the coefficients of the low‑cycle fatigue curves exhibit a pronounced dependence on both the temperature and the loading cycle asymmetry, as well as on each other. The relationship between the fatigue curve coefficients is close to linear and statistically consistent across different loading cycle asymmetries, which suggests the existence of a focal point for the low‑cycle fatigue curves. A hypothesis is proposed that the relationship between the low‑cycle fatigue curve coefficients remains constant for this particular material.

Keywords:

low-cycle fatigue; focal point; durability; cycle asymmetry; EP741NP

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