Fatigue Assessment of Defect-Free and Defect-Containing Brazed Steel Joints |
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Authors: | Christian Leinenbach Michael Koster and Hans-Jakob Schindler |
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Affiliation: | (1) Laboratory of Joining and Interface Technology, EMPA-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 D?bendorf, Switzerland;(2) Mat-Tec AG, Winterthur, Switzerland |
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Abstract: | 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. |
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