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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:
AuthorsInstitution or Email of Authors
Tesch, AndreasUNSPECIFIED
Pippan, ReinhardErich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben
Döker, HubertUNSPECIFIED
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 (old)
HGF - Program:Aeronautics
HGF - Program Themes: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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