Extremely Low Cycle Fatigue Damage Mechanism, Fractographic Examination, And Life Prediction

Keywords

Ductile fracture; Extremely low cycle fatigue (elcf); High strain amplitude cyclic loading; Lode angle parameter; Stress triaxiality

Abstract

The extreme high strain cyclic loading, termed extremely low cycle fatigue (ELCF), causes metals to fail in a few (less than 100) cycles. ELCF is more likely seen in heavy load machines' startup or shutdown failures and in steel-structured bridges subjected to earthquakes. This research summarizes an extensive work of experimental and numerical studies of ELCF under different stress states for Inconel 718. The modified Mohr-Coulomb (MMC) ductile fracture model, a function of stress triaxiality and Lode angle parameter, is adopted with an adequate new extension that aims to capture ELCF. A new parameter is introduced to the damage accumulation rule to represent the effect of the cyclic loading. The model explores the underlying damage and fracture mechanisms through the equivalent plastic strain evolution. The ELCF damage and fracture mechanisms are implemented into finite element analysis (FEA). Finally, fractographic examinations, analysis, and finite element simulations are presented with good correlation.

Publication Date

1-1-2016

Publication Title

Materials Science and Technology Conference and Exhibition 2016, MS and T 2016

Volume

2

Number of Pages

967-974

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

85017129993 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85017129993

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