MATEC Web Conf.
Volume 165, 201812th International Fatigue Congress (FATIGUE 2018)
|Number of page(s)||7|
|Section||Growth of Short and Long Cracks - Crack Growth Thresholds|
|Published online||25 May 2018|
Influence of static strength on the fatigue resistance of welds
Laboratory of Experimental Mechanics (LABMEX), INTEMA (Institute for Material Science and Technology), CONICET - University of Mar del Plata, J.B. Justo 4302 (B7608FDQ), Mar del Plata, Argentina
2 Faculty of Mechanical Engineering, University of Maribor, Slovenia
3 Institute for Materials Science and Welding, Graz University of Technology, Kopernikusg. 24 ( 8010), Graz, Austria
4 Voestalpine Stahl GmbH, Linz, Austria
* Corresponding author: firstname.lastname@example.org
The present paper deals with a fracture mechanic approach that employs the Resistance-Curve concept, in order to predict fatigue endurances of welded components, with different tensile strengths of the base metal. The Resistance-Curve method compares the total driving force applied to a crack with its threshold for propagation, both defined as a function of crack length. The former depends on load scheme and weld geometry and it can be obtained from finite element analyses, while the second is inherently related to weld resistance. Results obtained herein showed that threshold curve shape is changed when static strength of the base material is modified. Consequently, its interaction with the driving force differed, giving raise to different fatigue endurances for various values of the tensile strength. However, this effect is only likely to be leveraged, provided that the initial crack length is small enough. In real welded structures, the presence of defects demands longer initial crack lengths to be used in calculations, at which the benefit of enhanced strength is minimised or even inverted. Moreover, at these lengths, the growing process is mainly controlled by weld geometry and long crack propagation threshold, whereas local properties become less important in fatigue limit prediction.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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