Crack repair of SENT specimen using the interference fit process

This attempt aims at investigating the Interference Fit Process as a procedure to arrest a detectable crack size in mechanical part. The 7075-T6 Aluminum alloy cracked SENT specimen is considered in the current work. A 2D- FE analysis is implemented to simulate the stress distribution around the exp...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-06, Vol.748, p.363-374
Main Authors: Bahloul, Ahmed, Mhalla, Mohamed Maki, Bouraoui, CHokri
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Compressive properties
Computer simulation
Crack arrest
Crack propagation
Crack repair
Cracks
Design of experiments
Fatigue life
Fatigue life improvement
Finite element analysis
Interference
Interference fit
Interference fit bushing
Process parameters
Residual stress
Response surface methodology
Stress concentration
Stress distribution
Two dimensional analysis
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Summary:This attempt aims at investigating the Interference Fit Process as a procedure to arrest a detectable crack size in mechanical part. The 7075-T6 Aluminum alloy cracked SENT specimen is considered in the current work. A 2D- FE analysis is implemented to simulate the stress distribution around the expanded hole after Interference Fit Process. Lemaitre-Chaboche model was considered for describing the material behaviour. Both, fatigue life improvement and compressive residual stress distribution, arising from the Interference Fit Process, are predicted. Different crack lengths, different interference fit sizes and different crack arrest hole (CAH) diameters are investigated. In order to optimize the Interference Fit Technique's process parameters and study their effects and their interactions, the Response Surface Methodology (RSM) is implemented. Results show that higher fatigue life improvement is obtained at hole diameter equal to 6 mm, an Interference Fit Size equal to 0.2 mm and an initial crack size equal to 20 mm. The Design of Experiments (DoE) procedure can be used with the Interference Fit Process as an efficient tool to ensure the safety behaviour of cracked components. •The DoE coupled with the FE analysis is implemented.•The IF Process is used for crack repair.•For crack size = 20 mm, IFS = 0.2 mm and D = 6 mm provides higher fatigue life improvement.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.03.142