Fatigue Life Evaluation Considering Fatigue Reliability and Fatigue Crack for FV520B-I in VHCF Regime Based on Fracture Mechanics

• Main Authors: Jinlong Wang, Yuxing Yang, Jing Yu, Jingsi Wang, Fengming Du, Yuanliang Zhang
• Format: Article
• Language: English
• Published: MDPI AG 2020-03-01
• Series: Metals
• Subjects: fv520b-i; fatigue reliability; <i>p-sc-n</i> curve
• Online Access: https://www.mdpi.com/2075-4701/10/3/371

This paper focuses on the fatigue reliability analysis and the development of a new life model of reliability and crack growth mechanisms in FV520B-I (high strength martensitic-type stainless steels) in the very-high cycle fatigue (VHCF) regime, which haven&#8217;t been studied well. First, the fatigue test was carried out to clarify the fatigue failure mechanism in the very-high cycle regime. Based on the test results and fatigue reliability theory, the fatigue life distribution and <i>P-S-N</i> curves were modeled. A new fatigue life evaluation model for FV520B-I is proposed according to the fracture mechanics and classic life evaluation method. With the comprehensive application of <i>P-S-N</i> curves and a new proposed fatigue life evaluation model, a new assumption of a <i>P-Sc-N</i> curve is developed and verified, to quantitatively express the relationship between fatigue life, reliability and fatigue cracking. This is novel and valuable for further fatigue study of FV520B-I.