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Fatigue life prediction of 2524‐T3 and 7075‐T62 thin‐sheet aluminium alloy with an initial impact dent under block spectrum loading

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journal contribution
posted on 18.01.2021, 13:39 by D Chen, ZQ Cheng, Paul Cunningham, JJ Xiong
This paper presents a fatigue life prediction model of post-impacted sheets considering the effects of dent size and stress ratio. Low-velocity impact tests at four different impact energies were performed on specimens cut from sheets of
2524-T3 and 7075-T62 aluminium alloy. Following the impact tests, static tensile and uni-axial constant amplitude and block spectrum fatigue experiments were conducted. Numerical models were generated to determine the initial
residual stress patterns, residual stress relaxation, and stress concentration factors around the impact dent. The S-N curves and corresponding stress concentration factors and relaxed residual stresses of three of the post-impacted
specimens were used to determine the model parameters. Good agreement was achieved between the predictions and experimental results, and it has been demonstrated that the fatigue life prediction model can effectively simulate the effects of residual stress, stress concentration, and stress ratio on fatigue damage for post-impacted thin sheet aluminium alloy materials

Funding

National Natural Science Foundation of China (Grant No. 51875021)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Fatigue & Fracture of Engineering Materials & Structures

Volume

44

Issue

4

Pages

1096-1113

Publisher

Wiley

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by Wiley under the Creative Commons Attribution-NonCommercial 4.0 International Licence (CC BY-NC). Full details of this licence are available at: https://creativecommons.org/licenses/by-nc/4.0/

Acceptance date

02/01/2021

Publication date

2021-01-10

Copyright date

2021

ISSN

8756-758X

eISSN

1460-2695

Language

en

Depositor

Dr Paul Cunningham. Deposit date: 15 January 2021