Fatigue crack propagation in friction stir welded and parent AA6082
2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 77, no 6, 450-455 p.Article in journal (Refereed) Published
The fatigue crack propagation characteristics of a friction stir welded AI-Mg-Si alloy, 6082, have been investigated. The electrical potential drop method was used for measurements. A low and a high load ratio (R) level were tested. At low load ratio (R=0.1) and a low stress intensity Delta K the propagation rate in the weld was higher than in the parent material by a factor of 3 to 5. However, the propagation rates were approaching each other close to fracture. At high load ratio (R=0.8) the propagation rate was similar in the parent material and weld. The weld crack growth rate was about the same at low and high R (except close to fracture), while the parent material growth rate increased at high R. Paris law was used to describe the measured crack propagation rates in the weld. In the case of the parent material, showing an R-dependence, Forman's law was used.
Place, publisher, year, edition, pages
2006. Vol. 77, no 6, 450-455 p.
friction stir welding, Al-Mg-Si alloy, fatigue crack propagation, load ratio, residual stress, aluminum-alloys, growth
IdentifiersURN: urn:nbn:se:kth:diva-15833ISI: 000238898200012ScopusID: 2-s2.0-33745597337OAI: oai:DiVA.org:kth-15833DiVA: diva2:333875
QC 201005252010-08-052010-08-052010-10-08Bibliographically approved