Abstract
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’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 P-S-N 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 P-S-N curves and a new proposed fatigue life evaluation model, a new assumption of a P-Sc-N 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.
Highlights
FV520B-I, as an important high-strength engineering metal, has been widely adopted in the manufacturing of centrifugal compressor vanes for its positive mechanical properties, including high strength, high corrosion resistance, high abrasive resistance and good welding characteristics [1,2]
The parameters of the previous specific study of FV520B-I in the very-high cycle fatigue (VHCF) regime has been performed to address the question model are not the same when applying to dissimilar material modeling
The primary aim of this paper is to theories and models are specific to desired applications and conditions, and the parameters of the contribute to the quantitative expression of fatigue reliability for FV520B-I in the VHCF regime, and model are not the same when applying to dissimilar material modeling
Summary
FV520B-I, as an important high-strength engineering metal, has been widely adopted in the manufacturing of centrifugal compressor vanes for its positive mechanical properties, including high strength, high corrosion resistance, high abrasive resistance and good welding characteristics [1,2]. Fatigue reliability [3,4,5,6,7,8] refers to the probability that theoretical fatigue life will meet the actual required life time of the material, which can be quantitatively expressed by a probability of the fatigue life without the fatigue failure in solving real engineering fatigue problems, especially for the core components of large mechanical equipment. With FV520B-I being more and more widely used, there is increasing interest in detailed study modelling its fatigue reliability in the VHCF regime, and developing a new precise fatigue life evaluation model (which is beneficial to clarify fatigue failure characteristics, and very essential to avoid fatigue failure efficiently in real engineering practice).
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