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Fatigue Assessment of Defect-Free and Defect-Containing Brazed Steel Joints

Leinenbach, Christian ; Koster, Michael ; Schindler, Hans-Jakob

In: Journal of Materials Engineering and Performance, 2012, vol. 21, no. 5, p. 739-747

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    Title
    • Fatigue Assessment of Defect-Free and Defect-Containing Brazed Steel Joints
    Author
    • Leinenbach, Christian. Laboratory of Joining and Interface Technology, EMPA-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland
    • Koster, Michael. Laboratory of Joining and Interface Technology, EMPA-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600, Dübendorf, Switzerland
    • Schindler, Hans-Jakob. Mat-Tec AG, Winterthur, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Journal of Materials Engineering and Performance, 2012, vol. 21, no. 5, p. 739-747. Springer US; http://www.springer-ny.com
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:312978
    Summary
    This work aims at the development of lifetime estimation procedures for defect-free and defect-containing brazed joints. Preliminary investigations were performed to measure the influence of specimen geometry on the joint strength. To estimate the influence of defects on the fatigue lifetime, defect-free specimens were compared with specimens containing defects. The experiments show that defect-containing specimens provide considerably lower joint strengths than defect-free specimens. The decrease of the fatigue strength with increasing defect size can be shown, but the direct comparison of different defects is not possible with S-N-curves. Based on the experimental results and on theoretical investigations, a procedure was developed to estimate the lifetime of defect-free and defect-containing brazed joints based on the stress intensity caused by a defect