| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
Symposium on the Fatigue of Materials II: Advances and Emergences in Understanding
|
| Presentation Title |
Fractographic Observations on the Mechanism of Fatigue Crack Growth in Aluminium Alloys |
| Author(s) |
R. C. Alderliesten, Jaap Schijve, Milan Krkoska |
| On-Site Speaker (Planned) |
R. C. Alderliesten |
| Abstract Scope |
This paper addresses the question how crack closure and opening occur during cyclic loading. Modern techniques were adopted to determine how fatigue cracks open and extend during the rising part of a load cycle, and how cracks close during the load decreasing part. A special load history was adopted to obtain pictures of the crack tip at different load levels of a load cycle. The tests were carried out on 2024-T3 and 7075-T6 with CA cycles as baseline loading to which different underloads were added. Modern SEM techniques were used to obtain 3D characterizations of the fatigue crack surface morphology. Observations were made on mating locations of the upper and lower fatigue crack surfaces to assess deviations from mirror profiles. The results contribute to a more elaborated description of the fatigue crack morphology and understanding of the fatigue crack growth mechanism in aluminium alloys. Summarizing conclusions are presented. |
| Proceedings Inclusion? |
Definite: A combination print-CD volume |