Fatigue Resistance of 2219 Aluminum Alloy and its Welded Joints

Fatigue Resistance of 2219 Aluminum Alloy and its Welded Joints

The paper presents fatigue test results for 2219 aluminum alloy specimens, cut from a plate 40 mm in thickness, under symmetric and pulsating loading cycle. It is shown that at stresses for above the endurance limit, the fracture of specimens has a multi-site nature and starts from their surface. At...

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Bibliographic Details
Published in:Strength of materials Vol. 51; no. 6; pp. 860 - 867
Main Authors: Matokhnyuk, L. E., Byalonovich, A. V., Gopkalo, E. E., Vorob’ev, E. V., Karaush, D. P., Malyshko, V. I.
Format: Journal Article
Language:English
Published: New York Springer US 01-11-2019
Springer
Springer Nature B.V
Subjects:
Aluminum
Aluminum alloys
Aluminum base alloys
Arc welding
Argon
Butt welding
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crack initiation
Crack propagation
Fatigue
Fatigue cracks
Fatigue failure
Fatigue strength
Fatigue testing machines
Fatigue tests
Fracture mechanics
Heat affected zone
Heat treatment
Materials
Materials Science
Resistance welding
Solid Mechanics
Specialty metals industry
Stresses
Welded joints
Welding
yield strength
microstructure
argon-arc welding
endurance limit
resistance butt welding
ultimate strength
fractography
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Summary:The paper presents fatigue test results for 2219 aluminum alloy specimens, cut from a plate 40 mm in thickness, under symmetric and pulsating loading cycle. It is shown that at stresses for above the endurance limit, the fracture of specimens has a multi-site nature and starts from their surface. At stresses close to the endurance limit, the fatigue crack in the specimens fractured at a smaller number of loading cycles is initiated from their surface and at longer lives, from subsurface fracture initiation sites. This accounts for the significant scatter of data on the life of specimens near the endurance limit. Fatigue tests under zero-to-tension loading cycle showed that under the same heat treatment conditions, the endurance limit value of specimens made by resistance butt welding is close to that of specimens without weld and much higher than that of specimens with argon-arc weld. The fractographic investigations of the fracture of specimens with weld show that in both types of welding, the fatigue cracks propagate through pores in the weld or in the heat-affected zone.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-020-00136-3