Influence of stress ratio on residual stress evolution near cold-expanded hole due to low-cycle fatigue by crack compliance data

Andrey Chernov; Sviatoslav Eleonsky; Vladimir Pisarev

doi:10.3221/IGF-ESIS.55.13

Influence of stress ratio on residual stress evolution near cold-expanded hole due to low-cycle fatigue by crack compliance data

Authors

Andrey Chernov Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI). 1 Zhukovsky Street, Zhukovsky 140180 Moscow Region, Russia
Sviatoslav Eleonsky Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI). 1 Zhukovsky Street, Zhukovsky 140180 Moscow Region, Russia
Vladimir Pisarev Central Aero-Hydrodynamics Institute named after Prof. N.E. Zhukovsky (TsAGI). 1 Zhukovsky Street, Zhukovsky 140180 Moscow Region, Russia

DOI:

https://doi.org/10.3221/IGF-ESIS.55.13

Keywords:

Metal-composite joints, Cold hole expansion, Residual stress intensity factor, Residual stress

Abstract

Modified version of the crack compliance method is used for determination of stress intensity factor (SIF) related to narrow notches emanating from cold-expanded holes. These notches are inserted at different stages of low-cycle fatigue under constant external load. It is shown how residual SIF values, generated by residual stress field influence, can be separated from total experimental SIF values. Residual SIF values, obtained at different stage of low-cycle fatigue with the same stress range Δσ = 350 MPa but different stress R = –0.4 and R = –1.0, provide quantitative description of residual stress evolution near cold-expanded hole. It shown that maximal residual stress relaxation of order 20 per cent occurs at 95 lifetime per cent for both loading programs.

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Published

28-12-2020

Issue

Vol. 15 No. 55 (2021): January 2021

Section

Fatigue

License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Copyright
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

Influence of stress ratio on residual stress evolution near cold-expanded hole due to low-cycle fatigue by crack compliance data. (2020). Frattura Ed Integrità Strutturale, 15(55), 174-186. https://doi.org/10.3221/IGF-ESIS.55.13