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New Testing Procedure to Determine da/dN - K curves at different, Constant R-Values Using One Single Specimen
Tesch, Andreas and Pippan, Reinhard and Döker, Hubert (2006) New Testing Procedure to Determine da/dN - K curves at different, Constant R-Values Using One Single Specimen. In: Fatigue 2006, Proceedings 9th International Fatigue Congress May 14-19, 2006 Atlanta , Georgia, USA. Elsevier Ltd., GB. Fatigue 2006, 9th International Fatigue Congress, 2006-05-14 - 2006-05-19, Atlanta, Georgia, USA.
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Abstract
A new concept for fatigue crack propagation tests has been developed. Using a single specimen, it is possible to determine fatigue crack growth curves (da/dN - K) for every stress ratio between R = 0.9 and R = -1. Additionally, the new concept also provides threshold values for fatigue crack growth for different values of R. In combination with a continuous, autonomous crack length measurement tool (such as the DC potential drop method) this testing procedure can be implemented with minimal time and effort. The test procedure consists of a sequence of Kmax - constant tests with decreasing crack growth rates. There should be no load history effects. According to the procedures described in the ASTM Standard E 647, the results using this new testing procedure fit very well to the da/dN - K curves generated with different specimens. The tests fulfil all the requirements of ASTM Standard E 647.
| Document Type: | Conference or Workshop Item (Speech, Paper) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Title: | New Testing Procedure to Determine da/dN - K curves at different, Constant R-Values Using One Single Specimen | ||||||||
| Authors: |
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| Date: | May 2006 | ||||||||
| Journal or Publication Title: | Fatigue 2006, Proceedings 9th International Fatigue Congress May 14-19, 2006 Atlanta , Georgia, USA | ||||||||
| Refereed publication: | No | ||||||||
| In SCOPUS: | No | ||||||||
| In ISI Web of Science: | No | ||||||||
| Publisher: | Elsevier Ltd., GB | ||||||||
| Status: | Published | ||||||||
| Keywords: | Long cracks, fatigue crack growth, Kmax - tests, threshold, aluminium alloys | ||||||||
| Event Title: | Fatigue 2006, 9th International Fatigue Congress | ||||||||
| Event Location: | Atlanta, Georgia, USA | ||||||||
| Event Type: | international Conference | ||||||||
| Event Dates: | 2006-05-14 - 2006-05-19 | ||||||||
| Organizer: | Elsevier Ltd. | ||||||||
| HGF - Research field: | Aeronautics, Space and Transport | ||||||||
| HGF - Program: | Aeronautics | ||||||||
| HGF - Program Themes: | L AR - Aircraft Research | ||||||||
| DLR - Research area: | Aeronautics | ||||||||
| DLR - Program: | L AR - Aircraft Research | ||||||||
| DLR - Research theme (Project): | L - Structures & Materials | ||||||||
| Location: | Köln-Porz | ||||||||
| Institutes and Institutions: | Institute of Materials Research > Mechanical Testing of Materials | ||||||||
| Deposited By: | Dr.-Ing. Hubert Döker | ||||||||
| Deposited On: | 12 Dec 2006 | ||||||||
| Last Modified: | 14 Jan 2010 23:57 |
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