Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/115680
Title: Numerical simulation of fatigue crack growth based on accumulated plastic strain
Authors: Borges, M. F. M. 
Neto, D. M. 
Antunes, Fernando 
Keywords: Fatigue crack growth; Finite element method (FEM); Accumulated plastic strain; Damage accumulation model
Issue Date: 16-Jun-2020
Publisher: Elsevier
Project: Project no. 028789, financed by the European Regional Development Fund (FEDER), through the Portugal-2020 program (PT2020), under the Regional Operational Program of the Center (CENTRO-01-0145 FEDER-028789) and the Foundation for Science and Technology IP/ MCTES through national funds (PIDDAC) 
metadata.degois.publication.title: Theoretical and Applied Fracture Mechanics
metadata.degois.publication.volume: 108
Abstract: Fatigue crack growth (FCG) is simulated here by node release, which is made when the accumulated plastic strain reaches a critical value. The numerical procedure is very robust, showing a very fast stabilization and independence relatively to the load considered for node release. A critical accumulated plastic strain of 110% was obtained for the 2024-T351 aluminium alloy, comparing the experimental value of da/dN for a crack length of 26.5 mm and a stress ratio of 0.1, with plane strain numerical predictions. This critical value was used to predict da/dN for different crack lengths. The da/dN-ΔK curve was found to be linear in log-log plot with a slope m =2.4, which is lower than the slope m = 3.6 presented by the experimental results. The difference is attributed to crack tip mechanisms activated at relatively high loads. The variation of stress ratio and stress state did not affect the da/dN-ΔK curves, which indicates that the effect of these parameters is not linked to crack tip plastic deformation. FCG rate was also predicted for the 7050-T6 aluminium alloy and the 18Ni300 maraging steel, and slopes m = 3.09 and 2.70, respectively, were obtained for da/dN-ΔK curves. The predictions obtained for the steel agreed well with experimental results.
URI: https://hdl.handle.net/10316/115680
ISSN: 01678442
DOI: 10.1016/j.tafmec.2020.102676
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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