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Volume 15
Issue 5
10.3390/met15050481
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Numerical Simulation of the Effect of Pre-Strain on Fatigue Crack Growth in AA2024-T351

by
Diogo M. Neto
,
Edmundo Sérgio
,
André Agra
† and
Fernando V. Antunes
*
University of Coimbra, Centre for Mechanical Engineering, Materials and Processes (CEMMPRE), ARISE, Department of Mechanical Engineering, Pólo II, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
*
Author to whom correspondence should be addressed.
†
Current address: Aptiv, R. Max Grundig, 4705-086 Braga, Portugal.
Metals 2025, 15(5), 481; https://doi.org/10.3390/met15050481
Submission received: 27 March 2025 / Revised: 18 April 2025 / Accepted: 22 April 2025 / Published: 24 April 2025
(This article belongs to the Section Metal Failure Analysis)
Versions Notes

Abstract

The objective here is to study the effect of pre-strain on fatigue crack growth (FCG) in 2024-T351 aluminum alloy. Three pre-strain conditions were considered: without pre-strain, compressive and tensile permanent pre-strains of 4%. A numerical approach based on cumulative plastic strain at the crack tip was followed to predict FCG rate. The compressive pre-strain increased FCG rate, while the tensile pre-strain reduced the da/dN relative to the situation without pre-strain. The influence of pre-strain was linked with plasticity-induced crack closure. In fact, a linear trend was obtained between da/dN and ΔKeff for three crack lengths (a = 16.184; a = 15.048 mm and a = 15.152 mm) and three pre-strain conditions. The increase in the stress ratio from R = 0.1 to R = 0.5 and the elimination of the contact of crack flanks significantly reduced the effect of pre-strain, also pointing to the huge relevance of crack closure in this context. Finally, the effect of pre-strain on da/dN after an overload was also explained by crack closure variations.
Keywords: fatigue crack growth; AA2024-T351; pre-strain; crack closure; CTOD fatigue crack growth; AA2024-T351; pre-strain; crack closure; CTOD

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MDPI and ACS Style

Neto, D.M.; Sérgio, E.; Agra, A.; Antunes, F.V. Numerical Simulation of the Effect of Pre-Strain on Fatigue Crack Growth in AA2024-T351. Metals 2025, 15, 481. https://doi.org/10.3390/met15050481

AMA Style

Neto DM, Sérgio E, Agra A, Antunes FV. Numerical Simulation of the Effect of Pre-Strain on Fatigue Crack Growth in AA2024-T351. Metals. 2025; 15(5):481. https://doi.org/10.3390/met15050481

Chicago/Turabian Style

Neto, Diogo M., Edmundo Sérgio, André Agra, and Fernando V. Antunes. 2025. "Numerical Simulation of the Effect of Pre-Strain on Fatigue Crack Growth in AA2024-T351" Metals 15, no. 5: 481. https://doi.org/10.3390/met15050481

APA Style

Neto, D. M., Sérgio, E., Agra, A., & Antunes, F. V. (2025). Numerical Simulation of the Effect of Pre-Strain on Fatigue Crack Growth in AA2024-T351. Metals, 15(5), 481. https://doi.org/10.3390/met15050481

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