A crack propagation study on T-joints of AA6013-T4 aluminum alloy welded by an Yb:fiber laser

A crack propagation study on T-joints of AA6013-T4 aluminum alloy welded by an Yb:fiber laser A fundamental aspect of the replacement of the riveted to welded aluminum aircraft fuselage sections is the fatigue behavior. In this work, a fiber laser was used to produce different types of T-joint coupons in order to evaluate their crack propagation procedure during standard C(T) tests. Some defects such as cracks and pores had been observed and directly influenced the lifetime during testing. The cracks observed in high-speed regimes were associated with the hot cracking phenomena, and those coupons were not considered for crack propagation tests. These tests were carried out with the stringer parallel or perpendicular to the crack tip. The stringer has a positive effect on the fatigue crack propagation results, but the appearance of defects dramatically decreases the fatigue lives. The better results were those where the stringer was placed perpendicular to the crack, because of a retardation of the crack growth, in particular, 4 mm before reaching the joint. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The International Journal of Advanced Manufacturing Technology Springer Journals

A crack propagation study on T-joints of AA6013-T4 aluminum alloy welded by an Yb:fiber laser

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Publisher
Springer London
Copyright
Copyright © 2017 by Springer-Verlag London
Subject
Engineering; Industrial and Production Engineering; Media Management; Mechanical Engineering; Computer-Aided Engineering (CAD, CAE) and Design
ISSN
0268-3768
eISSN
1433-3015
D.O.I.
10.1007/s00170-017-0377-z
Publisher site
See Article on Publisher Site

Abstract

A fundamental aspect of the replacement of the riveted to welded aluminum aircraft fuselage sections is the fatigue behavior. In this work, a fiber laser was used to produce different types of T-joint coupons in order to evaluate their crack propagation procedure during standard C(T) tests. Some defects such as cracks and pores had been observed and directly influenced the lifetime during testing. The cracks observed in high-speed regimes were associated with the hot cracking phenomena, and those coupons were not considered for crack propagation tests. These tests were carried out with the stringer parallel or perpendicular to the crack tip. The stringer has a positive effect on the fatigue crack propagation results, but the appearance of defects dramatically decreases the fatigue lives. The better results were those where the stringer was placed perpendicular to the crack, because of a retardation of the crack growth, in particular, 4 mm before reaching the joint.

Journal

The International Journal of Advanced Manufacturing TechnologySpringer Journals

Published: Apr 11, 2017

References

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