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  4. Fatigue crack growth rate measurements in GL D36 grade welded structural steel
 
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Fatigue crack growth rate measurements in GL D36 grade welded structural steel

Citation Link: https://doi.org/10.15480/882.1654
Publikationstyp
Master Thesis
Date Issued
2018
Sprache
German
Author(s)
Göpfrich, Josef  
Advisor
Ehlers, Sören  
Referee
Düster, Alexander  
Braun, Moritz  orcid-logo
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2017-10-25
Institut
Konstruktion und Festigkeit von Schiffen M-10  
TORE-DOI
10.15480/882.1654
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1657
In this master thesis, the differences in the crack growth behavior of welded and base material is investigated. The direct current potential drop method is used to document the crack propagation. The material are tested using middle tension samples. The test is carried out with cyclic loading, a force ratio of 0.1 and a frequenze of approximately 33 Hz. Based on the test result a calibration curve is created using the Johnson formular. With the help of crack and strain gauges the calibriation curve is validated. It is shown that the Johnson formular generates an accurated description of the crack propagation. The
calibration curve gives an electric current independent comparision of crack propagation and voltage drop. The conducted work in this thesis has shown that the welded material has a higher crack
resistance, then the base material. The difference is especially apparent for low stress intensity factor. The findings in this thesis can be used to investigated welded and base material at low temperatures.
Subjects
fatigue
welded
structural steel
DDC Class
620: Ingenieurwissenschaften
Lizenz
http://rightsstatements.org/vocab/InC/1.0/
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Masterarbeit Josef Goepfrich.pdf

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